JP2010020896A - Information recording device and method, program storing medium, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To optimize an FS (file system information). <P>SOLUTION: As shown in the upper part of Figure, a file is recorded in an area B303 in addition to a file recorded originally in an area B302 and further, the file recorded in the area B302 is updated and alternative recording is made to an area 302' etc. and then a plurality of FSs which are to be distributed and recorded in areas B301 and B301'' are read. Further, a plurality of read FSs are synthesized by collecting them to one area and recorded in a new area consisting of an area B301''' as shown in the lower part of Figure. This invention is applicable to an information recording device which records information on a recording medium. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an information recording apparatus and method, a program storage medium, and a program, and in particular, even if FS updating or addition frequently occurs, an FS recording area is set as a part of a file recording area as necessary. In addition, even if the FS is scattered, the information can be read or written at high speed by collecting the information into 1 by the optimization process. An information recording apparatus, method, and program that reduce TDMA consumption and enable TDMA to be updated frequently by setting TDMA to a larger size when logical overwriting is frequently used in advance. The present invention relates to a storage medium and a program.

  A technique for recording a file on a large-capacity recording medium is spreading.

  Various formats for recording files on such a large-capacity recording medium have been proposed.

  For example, there is a UDF (Universal Disc Format) used in a DVD (Digital Versatile Disc) (for example, see Non-Patent Document 1).

  By the way, in the above-mentioned UDF standard (Ver2.50), a function is added in which file system information is collectively arranged in an area called a metadata partition and arranged on a logical address in the metadata partition.

  However, in write-at-once media (recording media that can be recorded only once), when the recorded file or file system is updated, it is recorded in a new area on the recording medium. Correspondingly, it is necessary to rewrite the logical address.

  For example, in the case of a Blu-Ray Disc (hereinafter also referred to as BD) corresponding to the UDF standard (Ver2.50), files and file system information are recorded as shown in the upper part of FIG. Here, FIG. 1 shows an example of a recording state on a BD write-at-once medium (hereinafter also referred to as Blu-Ray Disc-Recordable: BD-R). In FIG. 1, LSN (Logical Sector Number: logical address) is set from the left in the figure. In the upper part of FIG. 1, the areas set as volume spaces are 0 to N. It has become. An area described as “Reserved” at the head position of the LSN indicates a reserved area. An area described as “VRS (Volume Recognition Sequence)” indicates an area in which information for recognizing the file system type is recorded. In an area described as “Files (Stream + DB)”, stream data recorded or reproduced by an application program for recording or reproducing stream data on a BD and database information used for the reproduction processing are recorded. Indicates the area. An area described as “Files (out of BD management)” indicates an area in which data recorded by a program other than an application program for recording or reproducing stream data on a BD is recorded. An area described as “FS (Metadata)” indicates an area in which file system information is recorded as metadata. A second area described as “Anchor” indicates an area in which anchor information is recorded. An area described as “Volume Str. (Volume Structure)” indicates an area in which volume structure information is recorded. The area described as “Files (Stream + DB)” is also referred to as area B0. The areas indicated as “FS”, “Anchor”, and “Volume Str.” Are also collectively referred to as area B1.

  For example, when stream data is added to the BD-R in the state shown in the upper part of FIG. 1 and the database information is updated, the BD-R has the following information as shown in the lower part of FIG. Information will be recorded.

That is, the new stream data added to the information described in the area B0 and the reproduction database information are recorded in the area B0 ′. Further, the file system information (hereinafter also referred to as FS) updated by newly adding information, the anchor information corresponding to the FS, and the volume structure information are stored in the subsequent area B0 ′. It will be recorded in B2. At this time, the FS information, the anchor information corresponding to the FS, and the volume structure information recorded in the area B1 are unreadable.
Universal Disk Format Specification Revision 2.50 April 30, 2003 Optical Storage Technology Association

  By the way, in write-at-once media (recording media that can be recorded only once), when a recorded file or file system (also referred to as FS) is updated, it is recorded in a new area on the recording medium. Therefore, it is necessary to rewrite the logical address correspondingly.

  For this reason, the file system information (FS) updated in the alternative area or user area, which is provided as a standard for file formats such as UDF, is recorded as an alternative to the file system information before update. In order to update the file system information without changing the logical address, it has been proposed.

  However, if file addition and update are repeated and FS logical overwrite processing is repeated, the replacement information for managing the area recorded as a substitute becomes large, and file update and addition are repeated, resulting in the result As a result, a large area (particularly TDMA: Temporary Defect Management Area) reserved as an alternative area may be consumed.

  In addition, if the FS cannot be recorded due to repeated updating of the FS in a track set in advance for recording the FS, it is necessary to newly set the FS in another area. Since there is no command to divide an existing track, an area for recording a new FS cannot be set in an unused area among areas set for recording files. There was a problem that the file could not be recorded or updated.

  In addition, even if an area for recording a new FS can be set, if this process is repeated, not only will the FS be scattered, but the number of parts that are physically substituted will increase. Therefore, it may take time to read and write the file.

  The present invention has been made in view of such a situation. In particular, even when FS update or addition frequently occurs, the FS recording area is divided as necessary and a part of the file recording area is divided. In addition, even if the FS is scattered, the information recorded on the recording medium can be read or written at a high speed by combining them into 1 by the optimization process. When the logical overwriting is frequently used in advance, the TDMA can be updated frequently by setting the TDMA to a larger size and formatting.

  An information recording apparatus according to an aspect of the present invention includes a securing unit that secures an alternative information recording area on a recording medium, and an alternative source set in the alternative information recording area when logical overwriting is performed and when logical overwriting is not performed And setting means for setting the TDMA area at a rate larger than the ratio of the TDMA area in which the information managed by the defect list for associating the position with the alternative destination position is recorded.

  An information recording method according to one aspect of the present invention includes a securing step for securing an alternative information recording area on a recording medium, and an alternative source set in the alternative information recording area when there is logical overwriting and when there is no logical overwriting And a setting step for setting the TDMA area at a rate larger than the ratio of the TDMA area in which the information managed by the defect list for associating the position with the alternative destination position is recorded.

  A program storage medium according to one aspect of the present invention is set in an alternative information recording area in the case of a reservation control step for controlling the replacement information recording area on the recording medium and in the case of logical overwriting and in the absence of logical overwriting. A setting control step for controlling the setting of the TDMA area at a rate larger than the ratio of the TDMA area in which information managed by the defect list that associates the substitution source position with the substitution destination position is recorded. It is characterized by that.

  The program according to one aspect of the present invention includes a reservation control step for controlling the replacement information recording area on the recording medium, and a replacement information set in the replacement information recording area when there is logical overwriting and when there is no logical overwriting. Processing including a setting control step for controlling the setting of the TDMA area at a rate larger than the ratio of the TDMA area in which the information managed by the defect list that associates the original position with the alternative destination position is recorded. The computer is executed.

  In the information recording apparatus, method, and program according to one aspect of the present invention, an alternative information recording area is secured on a recording medium, and is set as an alternative information recording area when there is logical overwriting and when there is no logical overwriting. The TDMA area is set at a rate larger than the ratio of the TDMA area in which information managed by the defect list that associates the substitution source position with the substitution destination position is recorded.

  The information recording apparatus of the present invention may be an independent apparatus or a block that performs information recording processing.

  According to the present invention, consumption of TDMA can be reduced, and information recorded on a recording medium can be read or written at high speed.

It is a figure explaining the update process of the conventional file system information. It is a figure which shows the structure of one Embodiment of the recording / reproducing apparatus to which this invention is applied. It is a figure which shows the structure of the recording / reproducing mechanism part of FIG. It is a figure which shows the example of group management. It is a figure which shows the structure of the directory and file produced | generated by the group management of FIG. It is a figure which shows the other example of group management. It is a figure which shows the structure of the directory and file produced | generated by the group management of FIG. It is a figure explaining the access procedure to the file by UDF. It is a figure explaining the access procedure to the file by UDF. It is a figure explaining the method of arrange | positioning file system information to a virtual address. It is a figure explaining the method of arrange | positioning file system information to a virtual address. It is a figure explaining the method of arrange | positioning file system information to a virtual address. It is a figure explaining a recording system in case a recording medium is BD-R. It is a flowchart explaining a format process. It is a figure explaining the setting of SA area | region. It is a figure explaining the setting of SA area | region. It is a flowchart explaining the write-in process by the recording / reproducing mechanism part of FIG. It is a figure explaining the write-in process by the recording / reproducing mechanism part of FIG. It is a figure explaining the other structure of a recording / reproducing mechanism part. FIG. 20 is a flowchart illustrating a writing process by a recording / reproducing mechanism unit in FIG. 19. FIG. It is a figure explaining the write-in process by the recording / reproducing mechanism part of FIG. It is a figure explaining the other structure of the recording / reproducing mechanism part. It is a flowchart explaining the writing process by the recording / reproducing mechanism part of FIG. It is a figure explaining the write-in process by the recording / reproducing mechanism part of FIG. It is a figure explaining the other structure of the recording / reproducing mechanism part. It is a flowchart explaining the writing process by the recording / reproducing mechanism part of FIG. FIG. 26 is a diagram illustrating a writing process by the recording / reproducing mechanism unit of FIG. 25. It is a figure explaining the other structure of the recording / reproducing mechanism part. It is a flowchart explaining the writing process by the recording / reproducing mechanism part of FIG. It is a figure explaining the write-in process by the recording / reproducing mechanism part of FIG. It is a figure explaining the other structure of the recording / reproducing mechanism part. FIG. 32 is a flowchart for explaining a writing process by a recording / reproducing mechanism unit of FIG. 31. FIG. FIG. 32 is a diagram for describing a writing process by a recording / reproducing mechanism unit in FIG. 31. FIG. 32 is a diagram for describing a writing process by a recording / reproducing mechanism unit in FIG. 31. It is a flowchart explaining the alternative information management process by the recording / reproducing mechanism part of FIG. It is a figure explaining the alternative information management process by the recording / reproducing mechanism part of FIG. It is a figure explaining the alternative information management process by the recording / reproducing mechanism part of FIG. It is a figure explaining the alternative information management process by the recording / reproducing mechanism part of FIG. It is a flowchart explaining the real recording process by the recording / reproducing mechanism part of FIG. It is a figure explaining the actual recording process by the recording / reproducing mechanism part of FIG. It is a figure explaining the actual recording process by the recording / reproducing mechanism part of FIG. It is a flowchart explaining the other real recording process by the recording / reproducing mechanism part of FIG. It is a figure explaining the other real recording process by the recording / reproducing mechanism part of FIG. FIG. 4 is a flowchart for explaining an actual recording process when a recording medium is mounted by the recording / reproducing mechanism section of FIG. 3. It is a figure explaining the actual recording process at the time of mounting of the recording medium by the recording / reproducing mechanism part of FIG. It is a flowchart explaining the SA setting process by the recording / reproducing mechanism part of FIG. It is a figure explaining the SA setting process by the recording / reproducing mechanism part of FIG. It is a figure explaining the other structure of the recording / reproducing mechanism part. 49 is a flowchart for explaining optimization processing by the recording / reproducing mechanism unit of FIG. 48. It is a figure explaining the optimization process by the recording / reproducing mechanism part of FIG. It is a figure explaining the optimization process by the recording / reproducing mechanism part of FIG. It is a figure explaining the optimization process by the recording / reproducing mechanism part of FIG. It is a figure explaining the optimization process by the recording / reproducing mechanism part of FIG. It is a figure explaining the optimization process by the recording / reproducing mechanism part of FIG. 49 is a flowchart for explaining division processing by the recording / reproducing mechanism unit of FIG. 48. It is a figure explaining the division | segmentation process by the recording / reproducing mechanism part of FIG. It is a figure explaining the division | segmentation process by the recording / reproducing mechanism part of FIG. 49 is a flowchart for explaining division processing for the mirror FS by the recording / reproducing mechanism unit of FIG. 48. FIG. 49 is a diagram for explaining a division process for the mirror FS by the recording / reproducing mechanism unit of FIG. 48;

  Embodiments of the present invention will be described below. The correspondence relationship between the invention described in this specification and the embodiments of the invention is exemplified as follows. This description is intended to confirm that the embodiments supporting the invention described in this specification are described in this specification. Therefore, although there is an embodiment which is described in the embodiment of the invention but is not described here as corresponding to the invention, it means that the embodiment is not It does not mean that it does not correspond to the invention. Conversely, even if an embodiment is described herein as corresponding to an invention, that means that the embodiment does not correspond to an invention other than the invention. Absent.

  Further, this description does not mean all the inventions described in this specification. In other words, this description is for the invention described in the present specification, which is not claimed in this application, that is, for the invention that will be applied for in the future or that will appear and be added by amendment. It does not deny existence.

  That is, the information recording apparatus according to one aspect of the present invention includes a securing unit that secures an alternative information recording area on a recording medium (for example, the initialization unit 62a that executes the process of step S291 in the flowchart of FIG. 46), and a logical overwrite. If there is no logical overwriting, the ratio of the TDMA area where the information managed by the defect list that associates the substitution source position with the substitution destination position set in the substitution information recording area is recorded. And setting means (for example, the initialization unit 62a in FIG. 3 that executes the processes of steps S293 and S294 in the flowchart of FIG. 46) x.

  The information recording method according to one aspect of the present invention includes a securing step for securing an alternative information recording area on a recording medium (for example, the process of step S291 in the flowchart of FIG. 46), a case where logical overwriting is performed, and a case where logical overwriting is not performed The TDMA area is set at a rate larger than the ratio of the TDMA area in which the information managed by the defect list that associates the substitution source position with the substitution destination position set in the substitution information recording area is recorded. And a setting step (for example, the processing of steps S293 and S294 in the flowchart of FIG. 46).

  Since the program storage medium and the program are the same as the information recording method, description thereof will be omitted.

  FIG. 2 is a diagram showing a configuration of an embodiment of a recording / reproducing apparatus 1 to which the present invention is applied.

  A CPU (Central Processing Unit) 11 executes various processes according to a program stored in a ROM (Read Only Memory) 12 or a storage unit 18. A RAM (Random Access Memory) 13 appropriately stores programs executed by the CPU 11 and data. The CPU 11, ROM 12, and RAM 13 are connected to each other by a bus 14.

  An input / output interface 15 is connected to the CPU 11 via the bus 14. The input / output interface 15 is connected to an input unit 16 including a keyboard, a mouse, and a microphone, and an output unit 17 including a display and a speaker. The CPU 11 executes various processes in response to commands input from the input unit 16. Then, the CPU 11 outputs an image, sound, etc. obtained as a result of the processing to the output unit 17.

  The storage unit 18 connected to the input / output interface 15 is composed of, for example, a hard disk and stores programs executed by the CPU 11 and various data. The communication unit 19 communicates with an information processing apparatus such as an external server via a network represented by the Internet or an intranet.

  The storage unit 18 stores various programs, and the CPU 11 reads out these programs and executes corresponding processes. The storage unit 18 stores, for example, an OS that is a basic program and a driver. The program stored in the storage unit 18 may be acquired and stored via the communication unit 19 in addition to the above.

  The image / audio codec 20 is read from the magnetic disk 41, the optical disk 42, the magneto-optical disk 43, the semiconductor memory 44, or the recording medium 81 (FIG. 3) of the recording / playback mechanism unit 22 connected to the drive 30. The image or audio file compressed by a predetermined compression method is expanded in a predetermined manner and supplied to the external connection I / F (Interface) 21 or the output unit 17. The image / audio codec 20 compresses an image signal and an audio signal supplied from the input unit 16 and the external connection I / F 21 by a predetermined method, and connects the magnetic disk 41, the optical disk 42, and the magneto-optical device connected to the drive 30. Recording is performed on the disk 43, the semiconductor memory 44, or the recording medium 81 (FIG. 3) of the recording / reproducing mechanism 22.

  The recording / reproducing mechanism 22 records predetermined information on a recording medium 81 (FIG. 3) such as a Blu-Ray Disc (trademark), which is a magneto-optical recording medium, or is recorded on the recording medium 81. Read information. The detailed configuration of the recording / reproducing mechanism 22 will be described later with reference to FIG.

  The drive 30 connected to the input / output interface 15 drives a magnetic disk 41, an optical disk 42, a magneto-optical disk 43, or a semiconductor memory 44 when they are mounted, and programs and data recorded there. Get etc. The acquired program and data are transferred to and stored in the storage unit 18 as necessary.

  Next, the operation of the recording / reproducing apparatus 1 in FIG. 2 will be described.

  When the CPU 11 is instructed by the input unit 16 to record the input data supplied via the external connection I / F 21, the CPU 11 performs image / audio based on a program stored in the ROM 12, the RAM 13, or the storage unit 18. The codec 20 is controlled, the input data is compressed by a predetermined compression method, supplied to the recording / reproducing mechanism 22, and the input data is recorded on a recording medium 81 (FIG. 3) described later.

  Further, when the input unit 16 instructs the reproduction of the data recorded on the recording medium 81 attached to the recording / reproducing mechanism unit 22, it is based on a program stored in the ROM 12, the RAM 13, or the storage unit 18. Then, the recording / playback mechanism unit 22 is controlled to play back the data recorded on the recording medium 81 and supplied to the video / audio codec 20, and the video / audio codec 20 is controlled to expand the input data by a predetermined expansion method. Thus, the data is output to the outside via the external connection I / F 21, or is output to the output unit 17 to be displayed or sound is output.

  Next, the detailed configuration of the recording / reproducing mechanism 22 will be described with reference to FIG.

  The control unit 51 controls the entire operation of the recording / reproducing mechanism unit 22, and controls the recording unit 52 based on the control signal supplied from the CPU 11, so that the recording / reproducing block 53 is connected to the recording medium 81. The information is recorded, or the reproducing unit 54 is controlled to cause the recording / reproducing block 53 to read the information recorded on the recording medium 81.

  The file system information generation unit 62 of the control unit 51 determines the recording position on the recording medium 81 by grouping the files with predetermined attributes of the input data based on the attributes of the files of the input data, and determines the files. In addition to recording, file system information is generated based on the information, supplied to the recording unit 52, and recorded on the recording medium 81. At this time, the file system information generation unit 62 records file system information, anchor information, and volume structure information in either a User area or an SA (SA: Spare Area) area on the recording medium 81. Also, the initialization unit 62a of the file system information generation unit 62 sets a recording area when formatting the recording medium 81, and also includes an SA area (disk management area) including an alternative sector area and a TDMA (Temporary Defect Management Area) area. ) Is set. The replacement sector is a sector for recording information instead of the destroyed sector when the sector on the recording medium 81 is physically destroyed. At this time, although the recording address on the physical recording medium 81 is changed, the logical address is not changed even when the alternative sector is used. In reading, even if an alternative sector is used, the operation is not affected. Therefore, when the file is added or updated, the file system information generation unit 62 of the control unit 51 controls the writing unit 73 to transfer the file system information, anchor information, and volume structure information to the SA area (alternate sector). Area). The TDMA area is an area in which substitution management information is additionally recorded in response to occurrence of substitution processing in accordance with data rewriting or defect detection. In the following description up to FIG. 45, the TDMA area and the alternative sector area are simply referred to as an SA area or an alternative sector area. Detailed description including the TDMA area will be described later in FIG.

  The file system information recognition unit 61 of the control unit 51 reads either main or mirror file system information supplied from the reproduction unit 54, and reads a predetermined file based on the file system information. More specifically, the file system information recognition unit 61 controls the reading unit 91 to read the file system information, the volume structure information, and the anchor information recorded in either the User area or the SA area. Let In the recording / playback mechanism unit 22 of FIG. 3, when recording information on the recording medium 81, the same file system information is recorded as main file system information and mirror file system information, respectively. Even if one of the file system information is destroyed, it has a double structure that can be used by the other. Hereinafter, the main file system information is also referred to as a main FS, and the mirror file system information is also referred to as a mirror FS.

  When the write process is executed, the replacement information management unit 63, when the data to be written is an overwrite process, the original position of the data on the logical address in cluster units (substitution source position), A location on the logical address where the data to be overwritten is recorded (substitution destination location) is associated and stored in the memory 63a as a DL (Defect List).

  When recording the data on the recording medium 81, the replacement information generation unit 64 reads the DL recorded in the memory 63a of the replacement information management unit 63, and determines the replacement destination cluster from the replacement source and replacement destination information in cluster units. Are continuously arranged, the continuous area is updated as one list on the DL, and the data is collectively recorded in the continuous area. Further, when the replacement information generation unit 64 records data on the recording medium 81, the replacement information generation unit 64 reads the DL recorded in the memory 63a of the replacement information management unit 63, and when the replacement destination is not continuously arranged, After changing the substitution destination arrangement so that a plurality of substitution destinations of DL are combined into one and configuring a continuous area, the continuous area is updated as a list of one and data is collected and recorded in a continuous area. .

  The recording / reproducing block 53 is controlled by the writing unit 73 or the reading unit 91 and physically records or reproduces information on the recording medium 81. The recording medium 81 can be recorded mechanically, optically, magnetically, or magneto-optically, and can be repeatedly written (for example, BD-RW (Blu-Ray Disc-Rewritable), DVD-RW) (Digital Versatile Disc-Rewritable) or DVD-RAM (Digital Versatile Disc-Random Access Memory) may be used, and data can be written only once (for example, BD-R (Blu-Ray Disc) -Recordable), DVD-R (Digital Versatile Disc-Recordable), DVD-ROM (including Digital Versatile Disc-Read Only Memory), etc. Any other recording medium may be used. Accordingly, the recording / reproducing block 53 may be any as long as it can record / reproduce corresponding to these recording media 81.

  The ECC encoder 71 adds an error correction code to the input, encodes it, and outputs it to the modulator 72. The modulation unit 72 modulates the data input from the ECC encoding unit 71 and outputs the data to the writing unit 73. The writing unit 73 supplies the data input from the modulation unit 72 to the recording / reproducing block 53 and causes the recording medium 81 to execute processing.

  The reading unit 91 of the reproducing unit 54 reads information recorded on the recording medium 81. The demodulating unit 92 demodulates the data read from the recording medium 81 by the reading unit 91 and supplies the demodulated data to the ECC decoding unit 93. The ECC decoding unit 93 separates the data supplied from the demodulation unit 92 into a normal file (for example, AV (Audio Visual) stream data) and file system information, and outputs the normal file as output data. The file system information is output to the control unit 51.

  Next, a file management structure of input data managed by the file system information generation unit 62 as a group will be described with reference to FIG. The recording medium 81 basically records files in UDF format. Accordingly, each file is recorded on the recording medium 81 in the UDF format in accordance with the management structure shown below.

  FIG. 4 shows an example of managing various data files when AV stream data is recorded on a rewritable recording medium. The management structure is the Blu-Ray Disc Rewritable (trademark) standard. (The management structure conforms to the Blu-Ray Disc Rewritable (trademark) standard, but the recording format is the UDF format). In FIG. 4, three layers of a content management layer, a playlist layer, and a clip layer are shown from the top in the figure. This management structure also corresponds to the management structure of Blu-Ray Disc Recordable (trademark).

  Here, the playlist management table 111 and the thumbnail management table 112 belong to the content management layer. Also, playlists 113-1 to 113-3 belong to the playlist layer. Furthermore, clip information 121-1 to 121-3 belongs to the clip layer. In the following description, when it is not necessary to distinguish the playlists 113-1 to 113-3 and the clip information 121-1 to 121-3, the playlist 113 and the clip information 121 are simply referred to. Other configurations are also referred to in the same manner.

  A combination of the AV stream 131 file and the clip information 121 file (having AV stream attribute information) is particularly called a clip. The AV stream 131 is, for example, MPEG-TS (Moving Picture Experts Group-Transport Stream) data, and is a file having a structure in which information such as Video, Audio, or subtitles is multiplexed. In addition, the AV stream 131 may be multiplexed with command information for performing control during reproduction. In the figure, an example in which command information is multiplexed is shown.

  A playlist has a structure that has multiple play items that refer to a specific range of a clip by using the playback start point and playback end point, and provides a function to continuously play multiple playback sequences with one playlist. is doing. Furthermore, a playlist management table 111 for presenting a list of playlists to the user, a thumbnail management table 112 used for the thumbnail display function, and thumbnail files 141-1 and 141-2 and thumbnail files 151- 1,151-2 exists.

  A pair of one AV stream 131 and its attached information is considered as one object, which is called a clip. The AV stream file is called an AV stream file, and the attached information is called clip information 121.

  In general, a file used in a computer or the like is handled as a byte string, but the content of the AV stream 131 is expanded on the time axis, and the playlist 113 designates an access point in the clip information 121 mainly by a time stamp. To do. When the playlist 113 gives the time stamp of the access point in the clip, the clip information 121 is used to find address information (data byte position) in the AV stream 131 at which to start decoding the stream. It is done.

  The playlist 113 is introduced for the purpose of allowing a user to select a playback section that the user wants to see from clips and easily edit it. One playlist 113 is a collection of playback sections in a clip. One playback section in a clip is called a play item, which is represented by a pair of IN point and OUT point on the time axis. Therefore, a playlist is a collection of play items.

  In FIG. 4, files are grouped as follows according to the usage / update frequency and the maximum total size of files belonging to the group. The playlist management table 111, thumbnail management table 112, and playlist 113 are in group 1, clip information 121 is in group 2, menu thumbnail files 141 and 142 are in group 3, and mark thumbnail files 151 and 152 are in group 4. are categorized.

  These files to be grouped are management data required when the AV stream 131 is reproduced. By extracting these management data and managing them in one place, the management data can be read quickly. As a result, AV stream data can be played back at high speed.

  In the above, the example of grouping the management data files of the AV stream 131 has been described. However, it is also possible to group files that are not defined in the Blu-ray Disc Rewritable standard. That is, in the figure, a group X is defined as a file group different from the management data file of the AV stream 131, and the files 161-1 and 161-2 belong to the group. Note that files 171-1 and 171-2 in the figure are files that are not grouped. Further, since the AV stream 131 is not management data, it is not managed as a group.

  FIG. 5 shows an example of the directory structure of Blu-Ray Disc Audio Visual (BDAV) information defined in Blu-Ray Disc Rewritable Format (BD-RE) recorded on the recording medium 81. Other directories may be created under the root directory, but they are ignored for UDF format records. The directory structure in FIG. 5 also supports Blu-Ray Disc Recordable (BD-R).

  As shown in the figure, the root directory includes one directory.

  In the “BDAV” directory, all files and directories defined by the BDAV application format are recorded. Further, the “BDAV” directory includes directories described below.

  A database file of the playlist 113 is recorded in the “PLAYLIST” directory. This directory is set even when there is no playlist 113.

  A database of clips is recorded in the “CLIPINF” directory. This directory is set even when there is no clip.

  An AV stream file is recorded in the “STREAM” directory. This directory is set even when there is no AV stream file.

  In the “BACKUP” directory, backup files of files classified into groups 1 and 2 are recorded. This directory is set even when there is no file classified into groups 1 and 2.

  The “PLAYLIST” directory records two types of PlayList files, Real PlayList and Virtual PlayList. In the case of FIG. 5, 11111.rpls and 22222.vpls are recorded. Of these, the file indicated by “xxxxx.rpls” holds information related to one Real PlayList, and one file is created for each playlist. Here, “xxxxx” is five numbers from 0 to 9.

  The file indicated by “yyyyy.vpls” holds information related to one Virtual PlayList, and one file is created for each playlist. The file name is “yyyyy.vpls”. Here, “yyyyy” is five numbers from 0 to 9.

  A Real PlayList is considered to share the stream portion of the clip it references. That is, the Real PlayList occupies the data capacity corresponding to the AV stream portion of the clip referenced by the Real PlayList in the disc. When the AV stream is recorded as a new clip, a Real PlayList that refers to the reproducible range of the entire clip is generated. When a part of the playback range of the Real PlayList is erased, the data of the clip stream part to which it refers is also erased.

  The Virtual PlayList is regarded as not sharing the clip data. Even if the VirtualPlayList is changed or deleted, the clip does not change anything. In the description of the present specification, the Real PlayList and the Virtual PlayList are collectively referred to simply as a play list.

  The “CLIPINF” directory holds one file corresponding to each AV stream file. In the case of FIG. 5, 01000.clpi and 02000.clpi are held.

  A file indicated by “zzzzz.clpi” is clip information 121 corresponding to one AV stream 131. The file name is “zzzzz.clpi”, where “zzzzz” is five numbers from 0 to 9.

  The “STREAM” directory holds AV stream files. In the case of FIG. 5, 01000.m2ts and 02000.m2ts are held.

  The file indicated by “zzzzz.m2ts” is the AV stream 131 file. The file name is “zzzzz.m2ts”, where “zzzzz” is five numbers from 0 to 9. Note that the same five numbers “zzzzz” are set as file names in one AV stream 131 file and the corresponding clip information 121.

  The “BDAV” directory holds menu1.tdt and menu2.tdt corresponding to the thumbnail files 141-1 and 141-2 immediately below, and also corresponds to the thumbnail files 151-1 and 151-2. mark1.tdt and mark2.tdt are held. Furthermore, info.bdav corresponding to the playlist management table 111 and menu.tidx and mark.tidx corresponding to the thumbnail management table 112 are held.

  In addition, a “DATA1” directory and a “DATA2” directory are set immediately under the “root” directory, and File1.dat, corresponding to the files 161-1 and 161-2 are respectively managed as groups. File2.dat... And FileA.dat, FileB.dat... Corresponding to the files 171-1 and 171-2 are held.

  In the files and directories managed under the directory shown in FIG. 5, as shown in FIG. 4, menu1.tdt and menu2.tdt corresponding to the thumbnail files 141-1 and 141-2 are group 3 and are thumbnail files. Mark1.tdt and mark2.tdt corresponding to 151-1 and 151-2 are group 4. info.bdav corresponding to the playlist management table 111, menu.tidx, mark.tidx corresponding to the thumbnail management table 112, In addition, 11111.rpls and 22222.vpls held in the "PLAYLIST" directory are grouped as group 1, and 01000.clpi and 02000.clpi held in the "CLIPINF" directory are grouped as group 2, respectively. Being held.

  In addition to the files managed by the BDFS group, File1.dat and File2.dat corresponding to the files 161-1 and 161-2 held in the “DATA1” directory are grouped as a group X. Yes.

  4 and 5 show the management structure in grouping in the case of recording on the recording medium 81 in the UDF format based on the Blu-Ray Disc Rewritable (rewritable recording medium) standard. 6 and 7, an example of a grouping management structure (logical format) in Blu-Ray Disc ROM (read-only recording medium) is shown. FIG. 5 shows an example in which HD (High Density) movie content is recorded.

  In FIG. 6, playlists 221-1 to 221-3, clip information 231-1 to 231-3, AV streams 232-1 to 232-3, files 251-1 and 251-2, and file 261- 1, 261-2 are playlists 113-1 to 113-3, clip information 121-1 to 121-3, AV streams 131-1 to 131-3, files 161-1 and 161-2 in FIG. The file 171-1 and 171-2 are the same as the file 171-1 and 171-2, and the description thereof is omitted as appropriate.

  Two layers of playback programs 211-1 and 211-2 (movie objects) and titles 201 and 202 exist above the clip information 231 and the playlist 221 described in FIG. 4. The playback program 211 (movie object) programmatically provides functions necessary for presenting HD movie content, such as specifying the playlist to be played, responding to user operations, jumping between titles 201 or 202, and branching of the playback sequence. is doing.

  The titles 201 and 202 can be recognized by the user and used as an index for starting the reproduction of the content. The titles 201 and 202 have a structure for designating one movie object to be executed. In addition to normal titles, there are titles that are automatically played back first and titles for displaying menus.

  The applications (application programs) 203 and 204 are for executing games and Web contents that are extended applications. At this time, the reproduction programs (execution objects) 212-1 and 212-2 are activated and executed. The playback program 212 may use a playlist or may not use a playlist. Further, the reproduction program 212 can refer to any image file 241, audio file 242, and file 243 in these application programs 203 and 204.

  The numbers of the titles 201 and 202 indicating the HD movie content and the applications 202 and 203 can be further increased, and are shown as Other 205 in FIG. Also, it is possible to record in a mixed manner on the recording medium 81, and FIG. 6 shows a mixed state.

  In FIG. 6, as in the case shown in FIG. 4, files are grouped as follows according to the usage / update frequency and the maximum total size of files belonging to the group. That is, titles 201 and 202, applications 203 and 204, Other 205, playback programs 211-1, 211-2, 212-1, 212-1, and playlists 221-1 to 221-3 are clipped to group A. Information 231 is classified as group B, and image file 241, audio file 242, and file 243 are classified as group C.

  Note that the groups A, B, and C in FIG. 6 are simply named for convenience as in the case of the groups 1, 2, 3, and 4 in FIG. 4, and are the same in terms of a group of files to be processed. belongs to.

  FIG. 7 shows an example of the directory structure of Blu-Ray Disc Movie (BDMV) information defined in Blu-Ray Disc ROM Format (BD-ROM) recorded on the recording medium 81. Other directories may be created under the root directory, but they are ignored for UDF format records.

  As shown in the figure, the root directory includes one directory.

  In “BDMV”, all files and directories defined by the BDMV application format are recorded. Further, the “BDMV” directory includes directories described below.

  A database file of the playlist 221 is recorded in the “PLAYLIST” directory. This directory is set even when there is no playlist 221.

  A database of clips is recorded in the “CLIPINF” directory. This directory is set even when there is no clip.

  An AV stream file is recorded in the “STREAM” directory. This directory is set even when there is no AV stream file.

  In the “BACKUP” directory, backup files of files classified into groups A and B are recorded. This directory is set even when there are no files classified into groups A and B.

  In the “PLAYLIST” directory in the case of FIG. 7, 11111.rpls and 22222.rpls are recorded. Of these, the file indicated by “xxxxx.rpls” holds information related to one Movie PlayList, and one file is created for each playlist. Here, “xxxxx” is five numbers from 0 to 9.

  The “CLIPINF” directory holds one file corresponding to each AV stream file. In the case of FIG. 7, 01000.clpi and 02000.clpi are held.

  A file indicated by “zzzzz.clpi” is clip information 231 corresponding to one AV stream 232. The file name is “zzzzz.clpi”, where “zzzzz” is five numbers from 0 to 9.

  The “STREAM” directory holds AV stream files. In the case of FIG. 7, 01000.m2ts and 02000.m2ts are held.

  The file indicated by “zzzzz.m2ts” is an AV stream 232 file. The file name is “zzzzz.m2ts”, where “zzzzz” is five numbers from 0 to 9. Note that the same five numbers “zzzzz” are set as the file name in one AV stream 232 file and the corresponding clip information 231.

  In the "BDMV" directory, Unit_Key_Gen_Value.inf and CPS_CCI.inf are held as copy control related files, and index.bdmv is held as a title management table file. . Furthermore, MoviObject.bdmv is held as a playback program management table.

  In addition, immediately under the “root” directory, a “Resource” directory, a “DATA1” directory, and a “DATA2” directory are set. These directories are not essential directories in the Blu-Ray Disc ROM Format, but are added as examples of directories for storing extended data required by the contents. In the “Resource” directory, Image.jpg, Audio.pcm, and Jimaku.txt corresponding to the image file 241, the audio file 242, and the file 243, which are files managed in groups, are held. The “DATA1” directory holds File1.dat and File2.dat corresponding to the files 251-1 and 251-2, and the “DATA2” directory holds files 261-1 and 261-2. FileA.dat, FileB.dat, etc. are stored.

  In the files and directories managed under the directory shown in FIG. 7, Unit_Key_Gen_Value.inf, CPS_CCI.inf, index.bdmv, MoviObject.bdmv, and 11111.mpls, 22222 held in the “PLAYLIST” directory .mpls is group A, 01000.clpi held in the "CLIPINF" directory, 02000.clpi is group B, and Image.jpg, Audio.pcm, held in the "Resource" directory, and , Jimaku.txt is stored as a group C.

  In addition to the files managed in the above group, File1.dat and File2.dat corresponding to the files 251-1 and 251-2 held in the “DATA1” directory are grouped as a group X.

  Next, before describing the recording process according to the present invention, a file access procedure in a conventional UDF will be described with reference to FIGS.

  FIG. 8 shows an example of the UDF Volume Structure structure, and FIG. 9 shows the contents of File Structure and Files. Here, a case of accessing “root / BDMV / Unit_Key_Gen_Value.inf” shown in FIG. 9 will be described as an example.

  In FIG. 8, Volume Structure records information about logical volumes and information about the start point of analysis of File Structure recorded in the partition. In FIG. 8, the leftmost column is LSN (Logical Sector Number), the second column from the left is Structure, the second column from the right is Descriptors, and the rightmost column is LBN (logical 9, the leftmost column is LBN (Logical Block Number), the center column is Structure, and the rightmost column is Descriptors. Each is shown.

  Address information in the volume is represented by LSN (logical sector number), and addresses in the partition are represented by LBN (logical block number). Further, when there are a plurality of partitions in the volume, a plurality of pieces of partition information can be recorded in the Logical Volume Descriptor.

  8 and 9, only the items necessary for the process will be described, and description of the items unnecessary for the process will be omitted as appropriate.

  First, the anchor information (Anchor Volume Descriptor Pointer) of Anchor-1 where the LSN indicated by the number 1 in FIG. 8 is 256 is analyzed, and the position of the Volume Descriptor Sequence indicated by the number 2 is acquired. Subsequently, the Volume Descriptor Sequence where the LSN indicated by the number 2 is located at positions 32 to 47 is analyzed. Volume Descriptor Sequence includes “Primary Volume Descriptor”, “Implementation Use Volume Descriptor”, “Partition Descriptor”, “Logical Volume Descriptor”, “Unallocated Spece Descriptor”, “Terminating Descriptor”, and “Trailing Logical Sectors” “Primary Volume Descriptor” is information identifying the volume, “Implementation Use Volume Descriptor” is information indicating compatibility, “Partition Descriptor” is information identifying the partition, and “Logical Volume Descriptor”. Is the information indicating the location of the logical partition, “Unallocated Spece Descriptor” is the information indicating the unused area, “Terminating Descriptor” is the information indicating the last position of the area, and “Trailing Logical Sectors” is the remaining area. Stores information.

  Among these, the position of the “Logical Volume Integrity Sequence” described in the “Logical Volume Descriptor” with the LSN of 35 indicated by the number 3 in FIG. 8, the position of the target partition, and the position of the File Set Descriptor in the partition To get.

  Further, the “Logical Volume Integrity Sequence” with 48 LSN indicated by the number 4 is analyzed, and the consistency check of the Volume information is performed. If there is no problem in consistency, the LSN 272 to 272 Null-272 indicated by the number 5 are checked. Analyzes the structure and files inside the partition. Access to the target partition can be started by the above procedure.

  Subsequently, since the root information is stored in the File Set Descriptor with the LBN of (A + 1) indicated by the number 11 in FIG. 9, this is analyzed, and the LBN indicated by the number 12 is (A + 3) Get the location of the File Entry (indicated as FE (Root Directory) in the figure) of the root directory.

  Further, the File Entry (indicated as FE (Root Directory) in the figure) of the root directory whose LBN indicated by the number 12 is (A + 3) is analyzed, and the location where the root directory information is described ( Get LBN = A + 4). Next, the FID (File Identifier Descriptor) of the BDMV directory indicated by the number 13 in the information of the root directory is analyzed, and the FE (File Entry) of the BDMV directory indicated by the number 14 (FE ( Position (LBN = A + 5).

  Further, the File Entry of the BDMV directory indicated by the number 14 is analyzed, and the position (LBN = A + 9) where the information of the BDMV directory is recorded is obtained.

  Subsequently, information on the BDMV directory is acquired, and the File Identifier Descriptor of Unit_Key_Gen_Value.inf in the BDMV directory indicated by the number 15 is analyzed to acquire the position of the File Entry of Unit_Key_Gen_Value.inf. Then, the file entry of Unit_Key_Gen_Value.inf of number 16 is analyzed, the position where the data of Unit_Key_Gen_Value.inf is recorded is obtained, the address where the data of Unit_Key_Gen_Value.inf is recorded is accessed, and the target data is obtained. . With the above procedure, the data of the “root / BDMV / Unit_Key_Gen_Value.inf” file indicated by the number 17 can be acquired.

  When the metadata partition introduced in UDF2.50 is used, the File Set Descriptor indicated by the number 11, the File Entry of the root directory indicated by the number 12, and the FID (File Identifier Descriptor of the BDMV directory indicated by the number 13 ), The FE (File Entry) of the BDMV directory indicated by the number 14, the File Identifier Descriptor of Unit_Key_Gen_Value.inf in the BDMV directory indicated by the number 15, and the File Entry of Unit_Key_Gen_Value.inf of the number 16 are logical in the metadata partition. Arranged using addresses.

  The position where the metadata partition is recorded can be acquired by the file entry of the metadata file. By reading the data in the metadata partition into memory at once, even when accessing files stored under multiple levels of directories, the file identifier descriptor, file entry, and directory information It is possible to avoid reading the information of 3 individually from the recording medium and to acquire and analyze information necessary for reading the file from the information of the metadata partition read on the memory.

  Next, a method for arranging file system information at a virtual address will be described with reference to FIGS.

  The file system information is arranged in one place as a metadata file using an address on a normal physical partition used in the file system. A virtual address (address 0 is set to the beginning of the partition) is assigned in the metadata file, and the file system information is constructed in the metadata partition in a format that refers to this virtual address.

  That is, the File Set Descriptor indicated by the number 11 as described in FIG. 9, the File Entry of the root directory indicated by the number 12, the FID (File Identifier Descriptor) of the BDMV directory indicated by the number 13, and the BDMV indicated by the number 14. Information from the FE (File Entry) of the directory, the File Identifier Descriptor of Unit_Key_Gen_Value.inf in the BDMV directory indicated by the number 15, and the File Entry (file entry) of the Unit_Key_Gen_Value.inf of the number 16 to the virtual in the metadata file It is possible to trace (read) using the address.

  In the upper part of FIG. 10, MD File FE (Metadata File File-Entry) is described in the area B11, and the file system information (FS) recorded in the area B12 can be traced based on this description. . That is, the MD File FE in the area B12 indicates that file system information (FS) is recorded in the area B11 that is the area of addresses A to A + X in the physical partition. As shown in the lower part of FIG. 10, the file system information (FS) described above is described in the area P1 of virtual addresses 0 to X in the metadata partition.

  The metadata partition may be arranged in a plurality of areas in the physical partition. For example, as shown in the upper part of FIG. 11, when the physical partition addresses A to A + X are located in two areas B23 and physical partition addresses B to B + Y, the MD File FE in the area B21 is stored. Indicates that file system information is recorded at two locations, an area B23 which is an area of addresses A to A + X in the physical partition and an area B22 which is an address B to B + Y of the physical partition. Then, as shown in the lower part of FIG. 11, the file system information is recorded in the area P2 of virtual addresses 0 to X + Y in the metadata partition.

  Further, as a function adopted in UDF2.50, two metadata files are arranged (one is a main metadata file (= main FS) and the other is called a mirror metadata file (mirror FS). It is also possible to increase the reliability of file system information (by placing metadata files (FS)).

  That is, as shown in FIG. 12, the (main) metadata file as file system information is arranged in the area B32 of addresses A to A + X of the physical partition, and the area B34 of addresses B to B + Y of the physical partition. When a mirror metadata file that is file system information is arranged in the area B31, the metadata file is recorded in the area B32 that is the area of addresses A to A + X in the physical partition in the MD File FE of the area B31. It is shown. Then, as shown in the lower part of FIG. 12, file system information is recorded as a (main) metadata file in the area P3 of virtual addresses 0 to X in the metadata partition. At this time, similarly, the MDM File FE in the area B33 indicates that the mirror metadata file is recorded in the area B34 which is the area of addresses B to B + X in the physical partition. Similarly to the main metadata file described above, file system information is recorded as a mirror metadata file in the area P3 of virtual addresses 0 to X in the metadata partition as shown in the lower part of FIG. Thus, by describing the same metadata file, the reliability of the file system information can be improved.

  Next, a recording method when the recording medium 81 is a BD-R will be described with reference to FIG. BD-R recording methods include a sequential recording mode and a random recording mode.

  The sequential recording mode is a mode in which information is sequentially recorded in a predetermined direction from a recording start position of the recording medium (generally, in the case of a disk-shaped recording medium, the center of the disk). On the other hand, the random recording mode is a mode for recording information by randomly setting positions on the recording medium. In a disc-shaped recording medium, information recorded by the sequential recording method is recorded in a state in which the temporal relationship is reflected in time, so that the reading speed can be increased. Therefore, in the following description, it is assumed that information is recorded in the sequential recording mode. However, as an embodiment of the present invention, the mode in which information is recorded on the recording medium is not limited to the sequential recording mode, and may be a random recording mode.

  FIG. 13 is a diagram showing an outline of the sequential recording mode among the BD-R recording methods.

  Information recorded on the BD-R is recorded in the User area in units of sessions. In FIG. 13, two sessions indicated as Session 1 and Session 2 are described in the User area, but it goes without saying that more sessions may be used. A session is composed of one or more SRRs (Sequential Recording Ranges). In addition, although a multi-session can be configured, only the last set session can be recorded.

  SRR (Sequential Recording Ranges) is composed of a plurality of clusters (64 KB), which is the smallest unit of information recorded on a BD-R, and corresponds to a track on a CD-R (Compact Disc-Recordable) medium. A recording unit. The SRR has two states, Open and Closed, and can be recorded when Open. When the recording is completed and then Closed, the SRR becomes unrecordable. Furthermore, up to 16 sessions can be open. Also, a maximum of about 7600 SRRs can be set for one BD-R. In FIG. 13, SRRs # 1 to # 5 are set, and SRRs # 1 to # 4 indicate that information has already been recorded in areas 281-1 to 281-4 (recoded). Is shown). Further, LRA (Last Recoding Allocation) is described at the end of the areas 281-1 to 281-4, which indicates the final recording position. In FIG. 13, sessions # 3 and # 5 are in the Open state, and other sessions are above Closed. For this reason, in sessions # 3 and # 5, it is indicated that the position immediately after the LRA is an NWA (New Writing Allocation) at which recording is newly started.

  Next, the format processing of the recording medium 81 will be described with reference to the flowchart of FIG.

  In step S1, the initialization unit 62a of the file system information generation unit 62 of the control unit 51 controls the writing unit 73 to set an SA (Spare Area) area on the recording medium 81 for the recording / playback block 53. The SA area setting process to be executed is executed. That is, for example, when the recording medium 81 is a single-layer BD-R, as shown in FIG. 15, the SA area is set at the end of each recording area on the inner and outer sides of the disc.

  Here, in FIG. 15, the left direction in the figure indicates the inner peripheral side of the recording medium 81, and the right direction in the figure indicates the outer peripheral side of the recording medium 81. Recording on the recording medium 81 is performed from the inner circumference side toward the outer circumference side. In addition, the recording medium 81 has an introductory part (Lead in Zone) (an area in which no information is recorded) that does not contribute to recording at the inner peripheral side end and a lead out part (Lead out Zone) that does not contribute to recording at the outer peripheral end ( Areas where information is not recorded are provided.

  In this case, the initialization unit 62a sets the SA region (ISA) on the inner peripheral side and the SA region (OSA) on the outer peripheral side in the adjacent regions of the introduction unit and the derivation unit, respectively. As a result, the area between the ISA and the OSA becomes a User area (User Data Area), and various information is substantially recorded in this User area. In the User area, information is recorded from the inner circumference side to the outer circumference side as described above, so the LSN (logical sector number) is from the inner circumference side as indicated by the arrow in the figure. It is set toward the outer peripheral side.

  Note that the size of the ISA and OSA areas can be set arbitrarily, but by setting the ISA and OSA areas large, cluster destruction and information write processing (to be described later) can be performed. Although the user area can be stabilized, the user area becomes smaller by that amount, and the area effective for recording information becomes smaller.

  Also, for example, when the recording medium 81 is a two-layer BD-R, as shown in FIG. 16, the end portions of the respective recording areas on the disc inner peripheral side and outer peripheral side of the first layer surface and the second layer surface, respectively. SA area is set in

  Here, in FIG. 16, the left direction in the figure indicates the inner peripheral side of the recording medium 81, and the right direction in the figure indicates the outer peripheral side of the recording medium 81. Further, the layer indicated by L0 in the upper stage in FIG. 16 indicates the configuration of one layer surface, and the layer indicated by L1 in the lower stage in FIG. 16 indicates the configuration of two layer surfaces.

  In the case of the two-layer BD-R, recording on the recording medium 81 is performed from the inner peripheral side to the outer peripheral side on the first layer surface, and from the outer peripheral side to the inner peripheral side on the two-layer surface. . Further, the recording medium 81 has an introduction portion (Lead in Zone 0) (an area in which no information is recorded) that does not contribute to recording on the inner peripheral side end portion on one layer surface and a lead-out portion (Lead out) that does not contribute to recording on the outer peripheral side end portion. Zone0) (area where no information is recorded) is provided, and the lead-in part (Lead in Zone1) (area where no information is recorded) and the outer peripheral side end contribute to recording on the two-layer surface at the inner peripheral end. A lead-out section (Lead out Zone 1) (area in which no information is recorded) is provided.

  In this case, the initialization unit 62a includes an inner peripheral SA region (ISA0, 1) and an outer peripheral SA region (OSA0, 1) in adjacent regions of the first layer surface, the second layer surface introduction unit, and the output unit. To set each. As a result, the area between ISA0 and OSA0 on the first layer surface and between ISA1 and OSA1 on the second layer surface becomes the User region, and various information is substantially recorded in this User region. In the User area on the first layer surface, information is recorded from the inner circumference side to the outer circumference side as described above, so the LSN (logical sector number) is set from the inner circumference side to the outer circumference side. Is done. On the other hand, in the User area on the second layer surface, information is recorded from the outer peripheral side to the inner peripheral side as described above, so the LSN (logical sector number) is also directed from the outer peripheral side to the inner peripheral side. Is set. Details of the SA area setting processing including setting of the TDMA area will be described later with reference to FIG.

  Now, the description returns to the flowchart of FIG.

  In step S2, the initialization unit 62a causes the alternative information management unit 63 to generate a DL (Defect List). Thereby, the alternative information management unit 63 generates and stores the DL in the memory 63a. At this stage, no information is included in the DL.

  In step S3, the initialization unit 62a controls the writing unit 73 to cause the recording / playback block 53 to set a volume space in the recording medium 81. That is, for example, a volume space is set as shown in the upper part of FIG. FIG. 18 shows an example in which the recording medium 81 uses a single-layer BD-R.

  In step S4, the initialization unit 62a controls the writing unit 73 to record the volume structure information and the anchor information on the recording medium 81 with respect to the recording / playback block 53. Set the area. That is, an area indicated by “Volume Str.” And an area indicated by “Anchor” shown in the upper part of FIG. In the example of FIG. 18, since the file system information has a double structure, an area for recording volume structure information corresponding to the main FS area and an anchor area (area B111 in the figure). "Volume Str." And "Anchor" areas), an area for recording volume structure information corresponding to the mirror FS area, and an anchor area ("Volume Str." Included in area B113 in the figure) "Anchor" area) is set respectively.

  In step S5, the initialization unit 62a controls the writing unit 73 to cause the recording / playback block 53 to set an FS area for recording file system information on the recording medium 81. That is, an area indicated by “FS” shown in the upper part of FIG. In the example of FIG. 18, since the file system information has a double structure, the FS area corresponding to the main FS area (“FS (Metadata)” included in the area B111 in the figure). Area) and a mirror FS area (area of “FS (MD-Mirror)” included in area B113 in the figure).

  In FIG. 18, at the time of formatting, from the left in the figure, the volume structure information and anchor information on the inner circumference side, the main FS, the file (Files (Stream + DB)), the mirror FS, and the volume structure on the outer circumference side Information and anchor information are set in one SRR.

  With the above processing, the ISA and OSA, the volume space, the anchor area, the area for recording the volume structure information, and the FS area, which are areas used as alternative sectors, are set in the recording medium 81. In the format, only an area is set, and information is not actually written. Further, the arrangement of the main FS (FS (Metadata)) and the mirror FS (FS (MD-Mirror)) in the figure may be exchanged. Furthermore, it is possible to set only a single FS. In this case, it may be set on either the inner peripheral side or the outer peripheral side.

  Next, a writing process for writing information to the recording medium 81 formatted (initialized) by the process of FIG. 14 by the recording / playback mechanism unit 22 of FIG. 3 will be described with reference to the flowchart of FIG.

  In step S <b> 11, the file system information generation unit 62 generates and reads file system information based on information such as additional writing or updated file attributes.

  In step S <b> 12, the file system information generation unit 62 determines whether it is the first writing process for the recording medium 81.

  For example, if it is determined in step S12 that the writing is the first writing, the process proceeds to step S13, and the file system information generation unit 62 passes the ECC encoding unit 71 and the modulation unit 72 through the writing unit. A file (Stream + DB: file consisting of stream data and a database for managing the stream data) input to 73 is written into the User area on the recording medium 81 by the recording / reproducing block 53.

  That is, as shown in the upper part of FIG. 18, the file system information generation unit 62 receives a file (Files (Steram + in the figure) input to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72. DB)) is recorded in the area B112 set on the recording medium 81 by the above-described formatting process. Note that FIG. 18 shows a case where the recording medium 81 is a single-layer BD-R as described above.

  In step S 14, the file system information generation unit 62 supplies the main FS to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and writes it in the User area on the recording medium 81 by the recording / reproducing block 53. Make it.

  That is, as shown in the upper part of FIG. 18, the file system information generation unit 62 supplies the file system information to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and By the formatting process described above, the main FS is recorded in the area B111 set for recording (recorded as “FS (Metadata)” in the figure).

  In step S 15, the file system information generation unit 62 supplies the volume structure information and anchor information on the inner circumference side to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and the recording / reproducing block 53 The data is written in the User area on the recording medium 81.

  That is, as shown in the upper part of FIG. 18, the file system information generation unit 62 supplies the volume structure information and anchor information to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and records them. By the above-described formatting process on the medium 81, the volume structure information and the anchor information on the inner circumference side corresponding to the main FS are recorded in the area B111 set for recording ("Volume Str." Record as "Anchor").

  In step S <b> 16, the file system information generation unit 62 supplies the mirror FS to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and writes it in the User area on the recording medium 81 by the recording / reproducing block 53. Make it.

  That is, as shown in the upper part of FIG. 18, the file system information generation unit 62 supplies the mirror FS to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and By the formatting process, the data is recorded in the area B113 set for recording the mirror FS (recorded as “FS (MD-Mirror)” in the figure).

  In step S 17, the file system information generation unit 62 supplies the volume structure information and anchor information on the outer peripheral side to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and is recorded by the recording / reproducing block 53. It is written in the User area on the medium 81.

  That is, as shown in the upper part of FIG. 18, the file system information generation unit 62 supplies the volume structure information and anchor information on the outer peripheral side to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72. Then, by the above-described formatting process on the recording medium 81, the volume structure information and the anchor information on the outer peripheral side corresponding to the mirror FS are recorded in the area B113 set for recording (“Volume Str. ”And“ Anchor ”of 2).

  On the other hand, when it is determined in step S12 that it is not the first writing, that is, for example, when information is recorded at least once by the processing of steps S13 to S17, the processing proceeds to step S18.

  In step S18, the file system information generation unit 62 includes a file (Stream + DB: stream data and a database for managing the stream data) input to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72. File) is written in the User area on the recording medium 81 by the recording / reproducing block 53.

  That is, for example, when information is recorded in a state as shown in the upper part of FIG. 18, the file system information generating unit 62 includes the ECC encoding part 71 as shown in the middle part of FIG. 18. The file (Files (Steram + DB) in the figure) input to the writing unit 73 via the modulation unit 72 is recorded in the area B112 ′ set by the above-described formatting process on the recording medium 81. More specifically, when the file is an additional record, the file system information generation unit 62 adds information newly added to the information recorded in the area B112 shown in the upper part of FIG. It records in area | region B112 'shown by the middle stage of FIG. Further, when recording a file in which new information is updated, the file recorded in the area B112 shown in the upper part of FIG. 18 is made unreadable, and the newly updated file is placed in an area adjacent to the area B112. The information of the area B112 ′ is configured and recorded so as to be recorded.

  In step S19, the file system information generation unit 62 controls the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and information on the main FS (FS (Metadata)) and volume structure, and the anchor Information is made unreadable from the recording medium 81 by the recording / reproducing block 53.

  That is, as shown in the middle part of FIG. 18, the file system information generation unit 62 records and reproduces the main FS (FS (Metadata)) and volume structure information and anchor information recorded in the area B111. Thus, reading from the recording medium 81 is disabled. In FIG. 18, areas that are not readable are indicated by white characters on a black background, and will be indicated similarly thereafter.

  In step S20, the file system information generation unit 62 overwrites the new main FS (FS (Metadata)), volume structure information, and anchor information generated by adding or updating the file in the process of step S19. Find the nearest SA area that can.

  That is, in the case of the single-layer BR-D, the SA area is either the OSA provided on the outer peripheral side or the ISA provided on the inner peripheral side. For example, in the case of the middle stage in FIG. When FS (FS (Metadata)) and volume structure information and anchor information can be recorded and the closest SA area is ISA, the file system information generation unit 62 can record the ISA. Choose as.

  In step S21, the file system information generation unit 62 supplies the main FS to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and the recording / playback block 53 searches for the main FS through the process of step S20. Write to SA area.

  That is, as shown in the middle part of FIG. 18, the file system information generation unit 62 supplies file system information to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and The data is written in the area B111 ′ in the ISA.

  Further, in step S22, the file system information generation unit 62 supplies the inner peripheral volume structure information and anchor information corresponding to the main FS to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72. Then, the recording / reproducing block 53 is written in the SA area retrieved by the process of step S20.

  That is, as shown in the middle part of FIG. 18, the file system information generation unit 62 sends the volume structure information and anchor information on the inner circumference side to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72. Then, the data is written in the area B111 ′ in the ISA on the recording medium 81.

  In step S23, the file system information generation unit 62 controls the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and the mirror FS (FS (MD-Mirror)) recorded on the outer peripheral side. The volume structure information and the anchor information are made unreadable from the recording medium 81 by the recording / reproducing block 53.

  That is, as shown in the middle part of FIG. 18, the file system information generation unit 62 records and reproduces the mirror FS (FS (MD-Mirror)), volume structure information, and anchor information recorded in the area B113. A block 53 makes the recording medium 81 unreadable.

  In step S24, the file system information generation unit 62 can record a new outer mirror FS (FS (MD-Mirror)), volume structure information, and anchor information in the process of step S23. Search the SA area of the location.

  That is, in the case of a single-layer BR-D, the SA area is either the OSA provided on the outer peripheral side or the ISA provided on the inner peripheral side. For example, in the case of the middle stage in FIG. When the mirror FS (FS (MD-Mirror)), volume structure information and anchor information can be recorded, and the nearest SA area is OSA, the file system information generation unit 62 records OSA. Select as the closest possible region.

  In step S25, the file system information generation unit 62 supplies the mirror FS to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and the file system information is recorded by the recording / reproducing block 53 in step S24. Write to the SA area retrieved by processing.

  That is, as shown in the middle part of FIG. 18, the file system information generation unit 62 supplies the mirror FS to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and the OSA on the recording medium 81. The data is written in the area B113 ′.

  In step S26, the file system information generation unit 62 supplies the volume structure information and anchor information on the outer peripheral side corresponding to the mirror FS to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72. Then, the recording / reproducing block 53 is written in the SA area retrieved by the process of step S24.

  That is, as shown in the middle part of FIG. 18, the file system information generation unit 62 supplies the volume structure information and anchor information on the outer peripheral side to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72. Then, the data is written in the area B113 ′ in the OSA on the recording medium 81.

  Further, when a file recorded on the recording medium 81 as shown in the middle part of FIG. 18 is added or updated, in step S18, as shown in the lower part of FIG. The file (Files (Steram + DB) in the figure) input to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72 is set by the above-described formatting process on the recording medium 81. It records in area | region B112 ''. More specifically, when the file is an additional write, the file system information generation unit 62 adds information newly added to the information recorded in the area B112 ′ shown in the upper part of FIG. , And is recorded in an area B112 ″ shown in the lower part of FIG. Further, when recording a file in which new information is updated, the file recorded in the area B112 ′ shown in the middle of FIG. 18 is made unreadable, and the newly updated file is adjacent to the area B112 ′. The information of the area B112 ″ is configured and recorded so as to be recorded in the area.

  In step S19, as shown in the lower part of FIG. 18, the file system information generation unit 62 records the main FS (FS (Metadata)) and volume structure information and anchor information recorded in the area B111 ′. The reproduction block 53 makes the recording medium 81 unreadable.

  In step S20, for example, in the case of the lower part of FIG. 18, when a new main FS (FS (Metadata)) and volume structure information and anchor information can be recorded and the nearest SA area is ISA, The system information generation unit 62 selects the nearest area where the ISA can be recorded.

  In step S 21, as shown in the lower part of FIG. 18, the file system information generation unit 62 supplies the main FS to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72. Are written in the area B111 ″ in the ISA.

  Further, in step S22, as shown in the lower part of FIG. 18, the file system information generation unit 62 sends the volume structure information and anchor information to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72. Supplied and written in the area B111 ″ in the ISA on the recording medium 81.

  In step S23, as shown in the lower part of FIG. 18, the file system information generation unit 62 performs mirror FS (FS (MD-Mirror)), volume structure information, and anchor information recorded in the area B 113 ′. Is made unreadable from the recording medium 81 by the recording / reproducing block 53.

  In step S24, for example, in the case of the lower part of FIG. 18, when a new mirror FS (FS (MD-Mirror)), volume structure information, and anchor information can be recorded, and the nearest SA area is OSA, The file system information generation unit 62 selects OSA as the nearest recordable area.

  In step S25, as shown in the lower part of FIG. 18, the file system information generation unit 62 supplies the mirror FS to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and on the recording medium 81 Are written in the area B113 ″ in the OSA.

  Further, in step S26, as shown in the lower part of FIG. 18, the file system information generation unit 62 sends the volume structure information and anchor information to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72. Then, the data is written in the area B113 ″ in the OSA on the recording medium 81.

  With the above process, when a file is added or updated, file system information, anchor information, and update information of volume structure information are sequentially recorded in the alternate sector of the SA area. The logical address of the recorded file system information, anchor information, and volume structure information is changed even though the anchor information and volume structure information are sequentially recorded at physically different positions. It is possible to record information on the recording medium without any problem. Further, it is not necessary to rewrite logical addresses such as file system information, anchor information, and volume structure information every time a file is added or updated. As a result, even for recording media that cannot be overwritten at the same location, for example, write-at-once media, information that is obliged to be recorded at a fixed location on the logical address is processed as if it were overwritten. It can be handled as if

  It should be noted that the recording processes in steps S13 to S18, S21, S22, S25, and S26 in the flowchart of FIG.

  In the above example, the file system information has been described as an example in which the updated new file system information is sequentially recorded. For example, the difference information between the file system information before the update and the file system information after the update. May be recorded in the SA area only (for example, only the information of the changed directory). In such a case, the file system information of the recording medium 81 can be generated by using the file system information before the update and the difference information. As a result, it is possible to save the amount of information recorded in the SA area.

  Also, in the processing of steps S20 and S24, file system information, anchor information, and volume structure information can be recorded, and when searching for the nearest SA area, it is determined according to the position on the recording medium 81. Since the closest SA area is determined to some extent, a table in which such information is collected may be generated at the time of formatting, for example, and used when searching for the SA area. In this way, the SA area search process can be realized at higher speed.

  Further, the case where the recording medium 81 is a single-layer BD-R has been described above. However, for example, when the recording medium 81 is a double-layer BD-R, file system information and anchor information And when the volume structure information can be recorded and the nearest SA area is searched, if the physical distance is close, the searched SA area may be in a relationship that straddles layers. good. That is, for example, when the file system information, anchor information, and volume structure information of the first layer can be recorded and the nearest SA area is searched, the searched SA area is the nearest distance in the same layer. If the second SA layer is closer than the second SA region, the second SA region is selected. This makes it possible to read out updated file system information, anchor information, and volume structure information at high speed.

  Also, in the above, an example of recording each of the main FS and mirror FS in the SA area has been described. However, each of the main FS and mirror FS is recorded in the SA area each time a file is added or updated. Therefore, it is necessary to secure the corresponding area in the ISA or OSA, and as a result, the User area on the recording medium 81 may be limited to a small size.

  Therefore, only one of the main FS and the mirror FS may be written in the SA area.

  FIG. 19 shows a configuration of the recording / playback mechanism unit 22 in which only the file system information on the inner periphery side corresponding to the mirror FS, the anchor information, and the volume structure information are written in the SA area. In the recording / reproducing mechanism unit 22 of FIG. 19, the same reference numerals are given to the components corresponding to those of the recording / reproducing mechanism unit 22 of FIG. 3, and the description thereof will be omitted as appropriate.

  In the configuration of the recording / reproducing mechanism unit 22 in FIG. 19 and the recording / reproducing mechanism unit 22 in FIG. 3, the difference is that a control unit 301 is provided instead of the control unit 51. The control unit 301 replaces the file system information recognition unit 61, the file system information generation unit 62, the alternative information management unit 63, and the alternative information generation unit 64 of the control unit 51 with a file system information recognition unit 311, a file system information generation The difference is that a unit 312, an alternative information management unit 313, and an alternative information generation unit 314 are provided.

  The file system information recognizing unit 311 has the same basic functions as the file system information recognizing unit 51. However, when recognizing the file system information, the mirror FS is always used from the fixed logical address, and the volume structure on the inner circumference side. And the anchor information are read out, and the main FS, the volume structure information on the outer peripheral side, and the anchor information are read out from the User area.

  The file system information generation unit 312 has the same basic functions as the file system information generation unit 62. However, when a file is added or updated, the main FS, the anchor information on the outer peripheral side, and the volume structure Are recorded in the User area, and the mirror FS, the inner anchor information, and the volume structure information are recorded in the SA area.

  The initialization unit 312a of the file system information generation unit 312 is basically the same as the initialization unit 62a, but formats the arrangement of the mirror FS and the main FS so that they are interchanged between the inner peripheral side and the outer peripheral side. That is, as shown in the upper part of FIG. 21 to be described later, the anchor information and volume structure information corresponding to the mirror FS are set in the area B131, and the anchor information and volume structure information corresponding to the main FS are set in the area B133. Set to In FIG. 21, the volume structure information and anchor information on the inner circumference side, the main FS, and the file, mirror FS, anchor information, and volume structure information are set as one SRR.

  In this example, when a file is added or updated, only the mirror FS, inner anchor information, and volume structure information are recorded in the SA area, and the main FS, outer anchor information. An example in which volume structure information is recorded in the User area will be described. However, only the main FS, outer anchor information, and volume structure information are recorded in the SA area, and the mirror FS, inner periphery information is recorded. Anchor information and volume structure information may be recorded in the User area.

  The replacement information management unit 313, the memory 313a, the replacement information generation unit 314, and the memory 314a are the same as the replacement information management unit 63, the memory 63a, the replacement information generation unit 64, and the memory 64a of FIG. Is omitted.

  Next, the writing process by the recording / reproducing mechanism unit 22 of FIG. 19 will be described with reference to the flowchart of FIG.

  Note that the processes of steps S41 to S49 and the processes of steps S52 to S55 in the flowchart of FIG. 20 are the same as the processes of steps S11 to S19 and the processes of steps S23 to S26 described with reference to the flowchart of FIG. Since it is the same, the description is abbreviate | omitted.

  In step S41, the file system information is read, and in step S42, it is determined whether or not it is the first writing. For example, in the case of the first processing, in step S43, as shown in the upper part of FIG. , The recorded file (Files (Stream + DB) in the figure is recorded in the area B132 of the User area. In step S44, for example, as shown in the upper part of FIG. 21, the main FS (FS (Metadata )) Is recorded in the user area B 133. In step S45, information on the volume structure on the outer peripheral side corresponding to the main FS (Volume Str. In the figure) and anchor information (Anchor in the figure) are recorded. In step S46, the mirror FS (FS (MD-Mirror) in the figure) is recorded in the user area B131. Oite, information of peripheral side volume structure corresponding to the mirror FS (Volume in FIG Str.), And the anchor information (Anchor in the drawing) is recorded in the area B131 of the User region.

  Furthermore, in step S42, when a file is recorded by the processing of steps S43 to S47 described above, and then the file is additionally written, in step S48, as shown in the middle part of FIG. Files (Stream + DB) in the figure are added to the area B132 ′ of the User area In step S49, the main FS, the volume structure information on the outer peripheral side, and the anchor information described immediately before are set to unreadable. The

  In step S50, the file system information generation unit 312 supplies the main FS to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and the recording / reproducing block 53 causes the middle FS to be shown in the middle stage of FIG. Are written in the area B133 ′ of the User area.

  Further, in step S51, the file system information generation unit 312 supplies the volume structure information and anchor information on the outer peripheral side corresponding to the main FS to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72. As shown in the middle part of FIG. 21, data is written in the area B133 ′ of the User area.

  In step S52, the mirror FS (FS (MD-Mirror)), the volume structure information on the inner peripheral side, and the anchor information recorded in the middle area B131 ′ of FIG. The In step S53, the SA area at the nearest recordable position from the position where the mirror FS, the volume structure information on the inner circumference side, and the anchor information are recorded is searched. For example, in the middle of FIG. 21, the ISA is searched for as the nearest recordable SA area.

  In steps S54 and S55, the mirror FS, the inner-side anchor information corresponding to the mirror FS, and the volume structure information are recorded in the searched ISA area B131 ′ as shown in the middle of FIG. Is done.

  Further, when a file is added in this state, in step S48, as shown in the lower part of FIG. 21, the added file (Files (Stream + DB) in the figure is added to the area B132 ″ of the User area). In step S49, the main FS described in the area B133 ′ immediately before, the information on the volume structure on the outer peripheral side, and the anchor information are set to be unreadable.

  In step S50, the file system information generation unit 312 supplies the main FS to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and the recording / reproducing block 53 causes the lower FS to be shown in the lower part of FIG. To the user area B133 ″.

  Further, in step S51, the file system information generation unit 312 supplies the volume structure information and anchor information on the outer peripheral side corresponding to the main FS to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72. As shown in the lower part of FIG. 21, data is written in the area B133 ″ of the User area.

  In step S52, the mirror FS (FS (MD-Mirror)), the volume structure information on the inner circumference, and the anchor information recorded in the lower area B131 ′ of FIG. The In step S53, the SA area at the nearest recordable position from the position where the mirror FS, the volume structure information on the inner circumference side, and the anchor information are recorded is searched. For example, in the lower part of FIG. 21, the ISA is searched as the nearest recordable SA area.

  In steps S54 and S55, the mirror FS, the anchor information on the inner circumference side corresponding to the mirror FS, and the volume structure information are retrieved as shown in the lower part of FIG. To be recorded.

  When a file is appended or updated by the above process, only the mirror FS and the anchor information and volume structure information on the inner periphery corresponding to the mirror FS are recorded in the SA area. Compared with the case of the recording / reproducing mechanism 22 in FIG. 3, the capacity consumed by the SA area can be reduced to about half. However, in this case, the main FS, the anchor information corresponding to the main FS, and the volume structure information are recorded in the order of areas B133, B133 ′, and B133 ″ as shown in FIG. 21, for example. Since it will be changed, it is necessary to change the logical address. Therefore, in such a case, normally, the mirror FS is read, the mirror FS recorded on the fixed logical address is acquired, and only when the mirror FS cannot be read for some reason, the User area By reading the main FS recorded in the file, it is possible to save the SA area while taking advantage of the file system information read from the fixed logical address and the double FS configuration. It becomes possible.

  The details of each recording process in steps S43 to S48, S50, S51, S54, and S55 in the flowchart of FIG. 20 will be described later.

  In the above, an example in which the same main FS and mirror FS are respectively arranged to double the FS has been described. However, when a file is added or updated, main file system information In addition, only the volume structure information and the anchor information on the inner circumference side may be recorded in the SA area, and the usage amount of the SA area may be further saved.

  In FIG. 22, when a file is added or updated, only the main FS is recorded in the User area, and only the volume structure information and anchor information on the inner circumference side are recorded in the SA area. The structure of the recording / reproducing mechanism 22 is shown. In the recording / reproducing mechanism unit 22 in FIG. 22, the same reference numerals are given to the components corresponding to those of the recording / reproducing mechanism unit 22 in FIG. 19, and the description thereof will be omitted as appropriate.

  22 differs from the recording / reproducing mechanism 22 in FIG. 19 in that a control unit 331 is provided instead of the control unit 301. The control unit 331 replaces the file system information recognition unit 311, file system information generation unit 312, alternative information management unit 313, and alternative information generation unit 314 of the control unit 301 with a file system information recognition unit 341, file system information generation It is different in that each has a unit 342, an alternative information management unit 343, and an alternative information generation unit 344.

  The file system information recognition unit 341 has the same basic functions as the file system information recognition unit 311. However, when recognizing the file system information, the file system information recognition unit 341 receives the main FS, the outer volume structure information, and the anchor information. read out. In the example of FIG. 22, since only a single main FS is recorded, the file system information recognition unit 341 can only read the main FS as file system information.

  The file system information generation unit 342 has the same basic functions as the file system information generation unit 62. However, when a file is added or updated, single file system information, outer anchor information, and The volume structure information is recorded in the User area, and the anchor information on the inner periphery side and the volume structure information are recorded in the SA area.

  The initialization unit 342a of the file system information generation unit 342 is basically the same as the initialization unit 312a. However, unlike the initialization unit 312a, a single main FS is set in the User area. That is, as shown in the upper part of FIG. 24 to be described later, the single main FS, the outer anchor information and the volume structure information are set in the region B153, and the inner anchor information and the volume structure information are , Region B151 is set. In FIG. 24, the volume structure information and anchor information on the inner circumference side, and the main FS, file, mirror FS, anchor information, and volume structure information are set as one SRR.

  The replacement information management unit 343, the memory 343a, the replacement information generation unit 344, and the memory 344a are the same as the replacement information management unit 63, the memory 63a, the replacement information generation unit 64, and the memory 64a of FIG. Is omitted.

  Next, the writing process by the recording / reproducing mechanism unit 22 in FIG. 22 will be described with reference to the flowchart in FIG.

  Note that the processing of steps S71 to S81 in the flowchart of FIG. 23 is the same as the processing of steps S41 to S45 and the processing of steps S47 to S51 described with reference to the flowchart of FIG. To do.

  In step S71, the file system information is read. In step S72, it is determined whether or not it is the first writing. For example, in the case of the first processing, in step S73, as shown in the upper part of FIG. The recorded file (Files (Stream + DB) in the figure) is recorded in the area B152 of the User area. In step S74, for example, as shown in the upper part of FIG. 24, a (single) main FS (FS (Metadata) in the figure) is recorded in the area B153 of the User area. In step S75, information on the volume structure on the outer peripheral side (Volume Str. In the figure) and anchor information (Anchor in the figure) are recorded in the area B153 of the User area. In step S76, information on the volume structure on the inner circumference side (Volume Str. In the figure) and anchor information (Anchor in the figure) are recorded in the area B151 of the User area.

  Further, in step S72, when a file is recorded by the above-described processing of steps S73 to S76, and then the file is additionally written, in step S77, as shown in the middle part of FIG. Files (Stream + DB) in the figure is added to the area B152 ′ of the User area. In step S78, the main FS described in the area B153 immediately before, the volume structure information on the outer peripheral side, and the anchor information are set to be unreadable.

  In step S79, the file system information is written in the area B153 ′ of the User area as shown in the middle part of FIG. Further, in step S80, the volume structure information and anchor information on the outer peripheral side are written in the area B153 ′ of the User area as shown in the middle part of FIG.

  Further, in step S81, the file system information generation unit 342 sets the inner volume structure information and the anchor information recorded in the middle area B151 in FIG.

  In step S82, the file system information generation unit 342 searches for the SA area at the nearest recordable position from the position where the volume structure information on the inner circumference side and the anchor information are recorded. For example, in the middle part of FIG. 24, the ISA is searched for as the nearest recordable SA area.

  In step S83, the file system information generation unit 342 records the inner-side anchor information and the volume structure information in the searched ISA area B151 ′ as shown in the middle of FIG.

  Further, when a file is added in this state, in step S77, the added file (Files (Stream + DB) in the figure) is stored in the area B152 ″ of the User area as shown in the lower part of FIG. It is added. In step S78, the main FS, volume structure information, and anchor information described immediately before in the area B153 ′ are set to be unreadable.

  In step S79, the main FS is written in the area B153 ″ of the User area as shown in the lower part of FIG.

  Further, in step S80, the file system information generation unit 312 writes the volume structure information and anchor information on the outer peripheral side in the area B153 ″ of the User area as shown in the lower part of FIG.

  In step S81, the volume structure information and the anchor information on the inner circumference recorded in the lower area B151 ′ of FIG. 24 are made unreadable. In step S82, the nearest SA area that can be recorded is searched from the position where the volume structure information and the anchor information on the inner circumference side are recorded. For example, in the lower part of FIG. 24, the ISA is searched as the nearest recordable SA area.

  In step S83, the inner circumference anchor information and the volume structure information are recorded in B151 ″ of the searched ISA area, as shown in the lower part of FIG.

  When a file is appended or updated by the above process, only the anchor information and volume structure information on the inner circumference side are recorded in the SA area, so the volume structure on the fixed logical address is recorded. Information and anchor information can be read out. Further, it is possible to further save the capacity consumed by the SA area as compared with the case of the recording / reproducing mechanism 22 in FIG. 3 or FIG. However, also in this case, the recording positions of the main FS, the outer anchor information, and the volume structure information are changed in the order of areas B153, B153 ′, and B153 ″ as shown in FIG. 24, for example. Therefore, it is necessary to change the logical address.

  The details of the recording processes in steps S73 to S77, S79, S80, and S83 in the flowchart of FIG. 23 will be described later.

  In the above, file system information (both main FS and mirror FS or main FS only), volume structure information and anchor information, or volume structure information and anchor information are set at the beginning of the volume space. Although an example of recording in the SA area each time there is an update has been described, the information is not limited to a combination of these, for example, any one of file system information, volume structure information or anchor information Also good.

  In addition, file system information, volume structure information, or anchor information is recorded in the SA area at the beginning of the volume space, and file system information that accompanies the addition or update of files without changing the logical address. In the above example, the file system information, the volume structure information, or the anchor information can be read by executing the update of the volume structure information or the anchor information. Alternatively, a part of the file may be recorded in the SA area when updating.

  FIG. 25 shows a recording / playback mechanism unit that records a part of a file in the SA area in addition to file system information, volume structure information, and anchor information when a file is added or updated. 22 configurations are shown.

  In the recording / reproducing mechanism unit 22 in FIG. 25, the same reference numerals are given to the components corresponding to those of the recording / reproducing mechanism unit 22 in FIG. 3, and the description thereof will be omitted as appropriate.

  25 differs from the recording / reproducing mechanism unit 22 in FIG. 3 in that a control unit 351 is provided instead of the control unit 51. The control unit 351 replaces the file system information recognition unit 61, the file system information generation unit 62, the alternative information management unit 63, and the alternative information generation unit 64 of the control unit 351 with a file system information recognition unit 361, a file system information generation It is different in that a unit 362, an alternative information management unit 363, and an alternative information generation unit 364 are provided.

  The basic function of the file system information recognition unit 361 is the same as that of the file system information recognition unit 51. However, when the file system information is recognized, the file system information recognition unit 361 is always recorded from a fixed logical address to the inner ISA. File system information, volume structure information, anchor information, and file (stream data database DB: hereinafter referred to as a file (DB)) are read, and the outer file system information, volume structure information, and Read anchor information from the User area.

  The file system information generation unit 362 has the same basic functions as the file system information generation unit 62. However, when a file is added or updated, the file system information, anchor information, and volume structure on the inner periphery side. And the file (DB) are recorded in the SA area, and file system information, anchor information, and volume structure information on the outer peripheral side are recorded in the User area.

  The initialization unit 362a of the file system information generation unit 362 is basically the same as the initialization unit 62a, but the file is converted into stream data (Files (Stream)) and a database (Files (DB)) at the time of formatting. Set separately. That is, as shown in the upper part of FIG. 27 to be described later, in addition to anchor information and volume structure information corresponding to the main FS (FS (Metadata)), the database information (Files (DB)) is set in the area B171. The anchor information and volume structure information corresponding to the mirror FS (FS (MD-Mirror)) are set in the area B173.

  The replacement information management unit 363, the memory 363a, the replacement information generation unit 364, and the memory 364a are the same as the replacement information management unit 63, the memory 63a, the replacement information generation unit 64, and the memory 64a of FIG. Is omitted.

  Next, the writing process by the recording / reproducing mechanism unit 22 of FIG. 25 will be described with reference to the flowchart of FIG.

  In addition, about the process of step S101, S102 of the flowchart of FIG. 26, the process of step S105 thru | or S108, and step S113 thru | or S118, the process of step S11, S12 demonstrated with reference to the flowchart of FIG. Since it is the same as the process of S17 and the process of step S21 thru | or S26, the description is abbreviate | omitted.

  In step S101, the file system information FS is read. In step S102, it is determined whether or not it is the first writing. For example, in the case of the first process, in step S103, the file system information generating unit 362 The stream data (Files (Stream)) input to the writing unit 73 is written to the User area on the recording medium 81 by the recording / reproducing block 53 via the ECC encoding unit 71 and the modulation unit 72.

  That is, as shown in the upper part of FIG. 27, the file system information generation unit 362 receives a file (Files (Stream) in the figure) input to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72. Is recorded in the area B172 set by the above-described formatting process on the recording medium 81.

  In step S104, the file system information generation unit 362 receives a database (Files (DB): database for managing stream data) input to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72. The recording / reproducing block 53 writes the data in the User area on the recording medium 81.

  That is, as shown in the upper part of FIG. 27, the file system information generation unit 362 receives a file (Files (Steram + in the figure) input to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72. DB)) is recorded in the area B 171 set by the above-described formatting process on the recording medium 81.

  In step S105, for example, as shown in the upper part of FIG. 27, the main FS (FS (Metadata) in the figure) is recorded in the area B171 of the User area. In step S106, information on the volume structure on the inner periphery side corresponding to the main FS (Volume Str. In the figure) and anchor information (Anchor in the figure) are recorded in the area B171 of the User area. In step S107, the mirror FS (FS (MD-Mirror) in the figure) is recorded in the area B173 of the User area. In step S108, information on the volume structure on the outer circumference side corresponding to the mirror FS (Volume Str. In the figure) and anchor information (Anchor in the figure) are recorded in the area B173 of the User area.

  Furthermore, in step S102, when a file is recorded by the processing of steps S103 to S108 described above, and then the file is added or updated, the processing proceeds to step S109.

  In step S109, the file system information generation unit 362 records the file (Stream: file consisting of stream data) input to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72 by the recording / reproducing block 53. It is written in the User area on the medium 81.

  That is, for example, when information is recorded in a state as shown in the upper part of FIG. 27, the file system information generating unit 62 includes the ECC encoding part 71 as shown in the middle part of FIG. The file (Files (Stream) in the figure) input to the writing unit 73 via the modulation unit 72 is recorded in the area B 172 ′ set by the above-described formatting process on the recording medium 81. More specifically, when the file is a postscript, the file system information generation unit 362 adds information added to the newly recorded information to the information recorded in the area B172 shown in the upper part of FIG. It records in area | region B172 'shown by the middle stage of FIG. When recording a file with updated new information, the file recorded in the area B172 shown in the upper part of FIG. 27 is made unreadable, and the newly updated file is set in an area adjacent to the area B172. The information of the area B 172 ′ is configured and recorded so as to be recorded.

  In step S110, the file system information generation unit 362 controls the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and information on the main FS (FS (Metadata)) and the volume structure on the inner circumference side. The anchor information and Files (DB) are made unreadable from the recording medium 81 by the recording / reproducing block 53.

  That is, as shown in the middle part of FIG. 27, the file system information generation unit 362 has the main FS (FS (Metadata)), volume structure information, anchor information, and Files (DB) recorded in the area B171. (The database file updated when the file is added or updated) is made unreadable from the recording medium 81 by the recording / reproducing block 53.

  In step S111, the file system information generation unit 362 overwrites the new main FS (FS (Metadata)), volume structure information, anchor information, and database file (Files (DB)) in the process of step S110. Find the nearest SA area that can.

  That is, in the case of the single-layer BR-D, the SA area is either the OSA provided on the outer peripheral side or the ISA provided on the inner peripheral side. For example, in the case of the middle stage in FIG. When FS (FS (Metadata)), volume structure information, anchor information, and file Files (DB) can be recorded, and the nearest SA area is ISA, the file system information generation unit 362 records ISA. Select as the closest possible region.

  In step S112, the file system information generation unit 312 records the database file (Files (DB)) in the searched SA area. That is, for example, as shown in the middle part of FIG. 27, the file system information generation unit 362 records the database file (Files (DB)) in the area B171 ′ on the ISA that is the searched SA area.

  In step S113, the file system information generation unit 362 records the main FS in the searched SA area. That is, for example, as shown in the middle part of FIG. 27, the file system information generation unit 312 records the file system information in an area B171 ′ on the ISA that is the searched SA area.

  In step S114, the volume structure information and anchor information corresponding to the main FS are written into the area B 171 ′ of the SA area as shown in the middle part of FIG.

  In step S115, the mirror FS (FS (MD-Mirror)), the volume structure information on the outer peripheral side, and the anchor information recorded in the middle area B173 in FIG. 27 are made unreadable. In step S116, the SA area at the nearest position where the new mirror FS, volume structure information, and anchor information can be recorded is searched. For example, in the middle of FIG. 27, OSA is searched for as the nearest recordable SA area.

  In steps S117 and S118, the mirror FS, the outer anchor information, and the volume structure information are recorded in the searched OSA area B173 ′ as shown in the middle of FIG.

  Further, when a file is added in this state, in step S109, as shown in the lower part of FIG. 27, the added file (Files (Stream) in the figure is added to the area B172 ″ of the User area). In step S110, the main FS, the inner peripheral volume structure information, and the anchor information described in the area B171 ′ immediately before are set to be unreadable.

  In step S111, the closest position at which a new main FS (FS (Metadata)), volume structure information, anchor information, and database file (Files (DB)) can be recorded by the process of step S110. SA area is searched. For example, in the lower case of FIG. 27, a new main FS (FS (Metadata)), volume structure information, anchor information, and file Files (DB) can be recorded, and the nearest SA area is ISA. The file system information generation unit 362 selects the nearest area where the ISA can be recorded.

  In step S112, the database file (Files (DB)) is recorded in the searched SA area. That is, for example, as shown in the lower part of FIG. 27, the database file (Files (DB)) is recorded in the area B171 ″ on the ISA that is the searched SA area.

  In step S113, the main FS is written in the area B171 ″ of the User area as shown in the lower part of FIG.

  Further, in step S114, the volume structure information and anchor information on the inner circumference side corresponding to the main FS are written in the area B171 ″ of the User area as shown in the lower part of FIG.

  In step S115, the mirror FS (FS (MD-Mirror)), volume structure information, and anchor information recorded in the lower area B173 ′ of FIG. 27 are made unreadable. In step S116, the SA area at the nearest position where the new mirror FS, volume structure information, and anchor information can be recorded is searched. For example, in the lower part of FIG. 27, the OSA is searched for as the nearest recordable SA area.

  In steps S117 and S118, the mirror FS, the outer anchor information corresponding to the mirror FS, and the volume structure information are stored in B173 ″ of the searched OSA area as shown in the lower part of FIG. To be recorded.

  When a file is added or updated by the above process, in addition to the main FS and the anchor information and volume structure information on the inner periphery corresponding to the main FS, the database file (Files (DB)) is SA Since the data is recorded in the area, the stream data can be read without changing the allocation of the file system information when executing the read process for reproducing the stream data.

  Further, in either of the recording / reproducing mechanism 22 shown in FIGS. 19 and 22, a database file (Files (DB)) may be added as information recorded in the SA area.

  Furthermore, it goes without saying that the processing described in the above-described writing processing can realize the same processing even if the recording order is changed, but the processing for recording on the recording medium 81 is continuously performed. It is desirable that the processing be performed in one direction, which is performed from the inner peripheral side toward the outer peripheral side or from the outer peripheral side toward the inner peripheral side. By setting the processing order in this way, it is possible to speed up the writing process or the reading process.

  The details of each recording process in steps S103 to S109, S112 to S114, S117, and S118 in the flowchart of FIG. 26 will be described later.

  In the above example, when a file is added or updated, all or part of the update information of file system information, anchor information, and volume structure information is sequentially recorded in the SA area. However, when a file is added or updated, the update information of file system information, anchor information, and volume structure information is not limited to the SA area, but is recorded in the User area or SA area. You may make it do.

  In FIG. 28, when a file is added or updated, file system information, anchor information, and update information of volume structure information are written to the User area or SA area without being limited to the SA area. The structure of the recording / reproducing mechanism 22 is shown. In the recording / reproducing mechanism unit 22 in FIG. 28, the same reference numerals are given to the components corresponding to those of the recording / reproducing mechanism unit 22 in FIG. 3, and the description thereof will be omitted as appropriate.

  In the configuration of the recording / reproducing mechanism unit 22 in FIG. 28 and the recording / reproducing mechanism unit 22 in FIG. 3, the difference is that a control unit 371 is provided instead of the control unit 51. The control unit 371 replaces the file system information recognition unit 61, the file system information generation unit 62, the alternative information management unit 63, and the alternative information generation unit 64 of the control unit 51 with a file system information recognition unit 381, a file system information generation It is different in that a unit 382, an alternative information management unit 383, and an alternative information generation unit 384 are provided.

  The file system information recognition unit 381 is the same as the file system information recognition unit 61.

  The file system information generation unit 382 has the same basic functions as the file system information generation unit 62, but when a file is added or updated, the main FS that is added or updated, and anchor information on the outer periphery side , And volume structure information, mirror FS, anchor information on the inner circumference side, and volume structure information can be either an area (User area or SA area) that is close to each existing position. ), The main FS before update, the outer anchor information, and the volume structure information, the mirror FS, the inner anchor information, and the volume structure information. That is, the file system information generation unit 382 can also update the actual updated data on the recording medium 81 without changing the position on the logical address, as in the case of recording in the SA area. Record at the position.

  The replacement information management unit 383, the memory 383a, the replacement information generation unit 384, and the memory 384a are the same as the replacement information management unit 63, the memory 63a, the replacement information generation unit 64, and the memory 64a of FIG. Is omitted.

  Next, a writing process for writing information to the recording medium 81 formatted (initialized) by the process of FIG. 14 by the recording / reproducing mechanism unit 22 of FIG. 28 will be described with reference to the flowchart of FIG. In the flowchart of FIG. 29, the processing of steps S131 to S137, S139, and step S143 is the same as the processing of steps S11 to S19 and step S23 in the flowchart of FIG. .

  In step S138, the file system information generation unit 382 includes a file (Stream + DB: stream data and a database for managing the stream data) input to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72. File) is written in the User area on the recording medium 81 by the recording / reproducing block 53.

  That is, for example, when information is recorded on the recording medium 81 in the state shown in the upper part of FIG. 30, as shown in the lower part of FIG. The file (File1 ′ (Steram + DB) in the figure) input to the writing unit 73 via the modulation unit 72 is recorded in the area B192 ′ set by the above-described formatting process on the recording medium 81. . More specifically, when the file is an additional write, the file system information generation unit 382 adds information newly added to the information recorded in the area B192 shown in the upper part of FIG. It records in area | region B192 'shown by the lower stage of FIG. When recording a file with updated new information, the file recorded in the area B192 shown in the upper part of FIG. 30 is made unreadable, and the newly updated file is set in an area adjacent to the area B192. The information of the area B192 ′ is configured and recorded so as to be recorded. In FIG. 30, File2 (Steram + DB)) is a newly recorded file at a different timing from File1 (Steram + DB)).

  In step S140, the file system information generation unit 382 receives the new main FS (FS (Metadata)) generated by adding or updating the file, volume structure information, and anchor information in the process of step S139. Search for the nearest User area or SA area that can be overwritten.

  That is, for example, in the case of the upper part of FIG. 30, new main FS (FS (Metadata)) and volume structure information and anchor information can be recorded, and adjacent to the outer periphery direction as the nearest User area or SA area When there is a vacant area in the area (the area closest to the outer circumference direction) (in the case of the adjacent position on the right side of the area B191 in FIG. 30), the file system information generation unit 62 displays the area B191 ′ shown in the middle stage of FIG. Is searched as the closest recordable area.

  In step S141, the file system information generation unit 382 supplies the main FS to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and is searched by the recording / reproducing block 53 by the process of step S20. Write to the User area or SA area.

  That is, as shown in the middle part of FIG. 30, the file system information generation unit 382 supplies the file system information to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and It is written in the area B191 ′ of the User area.

  Further, in step S142, the file system information generation unit 382 sends the inner volume side volume structure information and anchor information corresponding to the main FS to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72. Then, the recording / reproducing block 53 is written in the User area or the SA area retrieved by the process of step S140.

  That is, as shown in the lower part of FIG. 30, the file system information generation unit 382 sends the volume structure information and anchor information on the inner circumference side to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72. Supplied and written in the area B 191 ′ of the User area on the recording medium 81.

  In step S144, the file system information generation unit 382 can record the new outer mirror FS (FS (MD-Mirror)), volume structure information, and anchor information in the process of step S143. Search the User area or SA area of the location.

  That is, in the case of FIG. 30, the file system information generation unit 382 performs the outer circumferential direction with respect to the area B193 in which the outer mirror FS (FS (MD-Mirror)), volume structure information, and anchor information are recorded. The OSA area B193 ′ is selected as the closest recordable area adjacent to.

  In step S145, the file system information generation unit 382 supplies the mirror FS to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and the file system information is recorded by the recording / reproducing block 53 in step S144. Write to the User area or SA area retrieved by the process.

  That is, as shown in the lower part of FIG. 30, the file system information generation unit 382 supplies the mirror FS to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and the OSA on the recording medium 81. In the area B193 ′.

  Further, in step S146, the file system information generation unit 382 supplies the outer volume side volume structure information and anchor information corresponding to the mirror FS to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72. Then, the recording / reproducing block 53 is written in the User area or the SA area searched by the process of step S144.

  That is, as shown in the lower part of FIG. 30, the file system information generation unit 382 supplies the volume structure information and anchor information on the outer peripheral side to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72. Then, the data is written in the area B193 ′ in the OSA on the recording medium 81.

  As a result of the above processing, when a file is added or updated, file system information, anchor information, and volume structure information update information are sequentially recorded as alternative sectors in the closest User area or SA area. Therefore, even though the file system information, anchor information, and volume structure information are sequentially recorded at physically different positions, the recorded file system information, anchor information, and volume structure information Information can be recorded on a recording medium without changing the logical address of the information. Further, it is not necessary to rewrite logical addresses such as file system information, anchor information, and volume structure information every time a file is added or updated. As a result, even for recording media that cannot be overwritten at the same location, for example, write-at-once media, information that is obliged to be recorded at a fixed location on the logical address is processed as if it were overwritten. It can be handled as if Further, since both the User area and the SA area are used by adding or updating a file, the SA area originally provided when a defective sector is generated on the recording medium 81 is changed to the original area. While securing the area to be used for the purpose, it can be used for normal file addition and overwriting as necessary.

  In the above description, the recording is performed in the nearest area adjacent in the outer circumferential direction. However, the recording may be performed in the area adjacent in the inner circumferential direction, or one of them may be selected. Further, details of each recording process in steps S133 to S138, S141, S142, S145, and S146 in the flowchart of FIG. 29 will be described later.

  In the above, when a file is appended or updated, file system information, anchor information, and volume structure information update information are sequentially recorded as alternative sectors in the nearest user area or SA area. As described above, when setting the dedicated SRR for recording file system information, anchor information, and volume structure information, respectively, when a file is added or updated, Update information of file system information, anchor information, and volume structure information may be recorded in the free area. In this case, if there is no free area in the dedicated SRR, it may be recorded in the SA area.

  FIG. 31 shows the setting of dedicated SRRs for recording file system information, anchor information, and volume structure information. When a file is added or updated, the file system information is stored in a free area in each SRR. 2 shows a configuration of the recording / reproducing mechanism unit 22 that records the anchor information and the update information of the volume structure information. In the recording / reproducing mechanism unit 22 of FIG. 31, the same reference numerals are given to the components corresponding to those of the recording / reproducing mechanism unit 22 of FIG. 3, and the description thereof will be omitted as appropriate.

  In the configuration of the recording / reproducing mechanism unit 22 in FIG. 31 and the recording / reproducing mechanism unit 22 in FIG. 3, the difference is that a control unit 391 is provided instead of the control unit 51. The control unit 391 replaces the file system information recognition unit 61, the file system information generation unit 62, the alternative information management unit 63, and the alternative information generation unit 64 of the control unit 51 with a file system information recognition unit 401, a file system information generation It is different in that a unit 402, an alternative information management unit 403, and an alternative information generation unit 404 are provided.

  The file system information recognition unit 401 is the same as the file system information recognition unit 61.

  The file system information generation unit 402 has the same basic functions as the file system information generation unit 62, but when recording a file, the main FS, the outer anchor information, the volume structure information, the mirror FS In addition, the anchor information on the inner circumference side and the information on the volume structure are recorded in each dedicated SRR. The file system information generation unit 402 also updates the main FS, the outer anchor information, the volume structure information, the mirror FS, and the inner anchor information when the file is added or updated. , And volume structure information to the area in each dedicated SRR (which may be either the User area or the SA area), the main FS before being updated, the anchor information on the outer peripheral side, and It is recorded as an alternative to the volume structure information, the mirror FS, the inner anchor information, and the volume structure information. In other words, the file system information generation unit 402 changes the actual updated data on the recording medium 81 without changing the position on the logical address as in the case of recording in the SA area. Record at the position.

  The replacement information management unit 403, the memory 403a, the replacement information generation unit 404, and the memory 404a are the same as the replacement information management unit 63, the memory 63a, the replacement information generation unit 64, and the memory 64a of FIG. Is omitted.

  Next, a writing process for writing information to the recording medium 81 formatted (initialized) by the process of FIG. 14 by the recording / playback mechanism unit 22 of FIG. 31 will be described with reference to the flowchart of FIG.

  In step S <b> 161, the file system information generation unit 402 generates and reads file system information based on information such as an additionally written or updated file attribute.

  In step S <b> 162, the file system information generation unit 402 determines whether it is the first writing process for the recording medium 81.

  In step S162, for example, when it is determined that it is the first writing, the process proceeds to step S163, and the file system information generation unit 402 passes the ECC encoding unit 71 and the modulation unit 72 through the writing unit. Recording / playback block 53 records a file (Stream + DB: stream data (Files (Stream) in FIG. 33)) and a database (Files (DB) in FIG. 81 is written in a dedicated SRR in the User area.

  That is, as shown in the upper part of FIG. 33, the file system information generation unit 402 receives a file (Files (Steram) in the figure) input to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72. And Files (BD management)) are recorded in the area B204 in the dedicated SRR 504 for recording the file (Files (Steram)) in the area set by the above-described formatting process on the recording medium 81, and the file (Files (BD management)) is recorded in the area B203 in the dedicated SRR 503 for recording. In FIG. 33, as described above, the case where the recording medium 81 is a single-layer BD-R is shown.

  In step S164, the file system information generation unit 402 supplies the main FS to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and the recording / playback block 53 stores the main FS in the User area on the recording medium 81. Write to the dedicated SRR 502 of the FS.

  That is, as shown in the upper part of FIG. 33, the file system information generation unit 402 supplies the file system information to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and By the above-described formatting process, the main FS is recorded in the area B202 of the dedicated SRR 502 set for recording (recorded as “FS (Metadata)” in the figure).

  In step S165, the file system information generation unit 402 supplies the volume structure information and anchor information on the inner circumference side to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and the recording / reproducing block 53 The data is written in a dedicated SRR in the User area on the recording medium 81.

  That is, as shown in the upper part of FIG. 33, the file system information generation unit 402 supplies the volume structure information and anchor information to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and records them. By the above-described formatting process on the medium 81, the volume structure information and the anchor information on the inner circumference side corresponding to the main FS are recorded in the area B201 in the dedicated SRR 501 set for recording ("Volume Str" in the figure). . "And" Anchor ").

  In step S166, the file system information generation unit 402 supplies the mirror FS to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and the recording / playback block 53 performs exclusive use in the User area on the recording medium 81. Write to SRR.

  That is, as shown in the upper part of FIG. 33, the file system information generation unit 402 supplies the mirror FS to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and the above-mentioned on the recording medium 81. By the formatting process, the data is recorded in the area B205 in the dedicated SRR 505 set for recording the mirror FS (recorded as “FS (MD-Mirror)” in the figure).

  In step S 167, the file system information generation unit 402 supplies the volume structure information and anchor information on the outer peripheral side to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and is recorded by the recording / reproducing block 53. The data is written in a dedicated SRR in the User area on the medium 81.

  That is, as shown in the upper part of FIG. 33, the file system information generation unit 402 supplies the outer volume structure information and anchor information to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72. Then, by the above-described formatting process on the recording medium 81, the information is recorded in the area B206 in the dedicated SRR 506 set to record the volume structure information and anchor information on the outer peripheral side corresponding to the mirror FS (“ “Volume Str.” And “Anchor” of 2).

  On the other hand, when it is determined in step S162 that it is not the first writing, that is, for example, when information is recorded at least once by the processes of steps S163 to S167, the process proceeds to step S168.

  In step S168, the file system information generation unit 402 receives a file (Stream + DB: stream data (Files (stream) in the figure)) input to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and A file (Files (BD management) in the figure) consisting of a database for managing the stream data is written by the recording / playback block 53 in a dedicated SRR in the User area on the recording medium 81.

  That is, for example, when information is recorded in a state where the recording medium 81 is as shown in the upper part of FIG. 33, as shown in the lower part of FIG. The file (Files (Steram) and Files (BD management) in the figure) input to the writing unit 73 via the modulation unit 72 is stored in the dedicated SRR 504 set by the above-described formatting process on the recording medium 81. Recording is performed in the area B 204 ′ and the area B 203 ′ of the dedicated SRR 503. More specifically, when the file is added as indicated by “Additional Files (Stream)” in the figure, the file system information generation unit 402 adds the area B204 of the dedicated SRR 504 shown in the lower part of FIG. Information obtained by adding the newly added information to the recorded information is recorded in the area B204 ′ of the dedicated SRR 504 shown in the lower part of FIG. In addition, when a file is recorded in which new information is updated as indicated by “additional files (BD management)” in the figure, the file is recorded in the area B203 in the dedicated SRR 503 shown in the lower part of FIG. The information of the area B203 ′ is configured and recorded so that the newly updated file is recorded in the area adjacent to the area B203 of the dedicated SRR 503.

  In step S169, the file system information generation unit 402 controls the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and information on the main FS (FS (Metadata)) and volume structure, and The anchor information is made unreadable from the recording medium 81 by the recording / reproducing block 53.

  That is, as shown in the lower part of FIG. 33, the file system information generation unit 402 is recorded in the main FS (FS (Metadata)) recorded in the area B202 of the dedicated SRR 502 and in the area B201 of the dedicated SRR 501. The information of the volume structure and the anchor information are made unreadable from the recording medium 81 by the recording / reproducing block 53. In FIG. 33, the area which is made unreadable is indicated by white characters on a black background, and will be indicated similarly thereafter.

  In step S170, the file system information generation unit 402 creates a new main FS (FS (Metadata)) generated by appending or updating a file, volume structure information, and anchor information in the process of step S169. With reference to each dedicated SRR, a new main FS (FS (Metadata)), a volume structure information, and a nearest position where anchor information can be recorded are searched.

  That is, in the case of the upper part of FIG. 33, the file system information generation unit 402 sets the new main FS in the dedicated SRR 502 of the main FS (FS (Metadata)) as a recordable position in the dedicated SRR 502 where reading is disabled. The region B202 ′ adjacent to the region B202 is searched. In addition, the file system information generation unit 402 sets the volume structure information, the new volume structure information in the anchor information dedicated SRR 501, and the dedicated SRR 501 that cannot be read as a position where the anchor information can be recorded. A region B201 ′ adjacent to the region B201 is searched.

  In step S171, the file system information generation unit 402 determines whether there is a free area for recording a new main FS in the dedicated SRR of the main FS. In the case of FIG. 33, since it exists, the process proceeds to step S172.

  In step S172, the file system information generation unit 402 supplies the main FS to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and is searched by the recording / reproducing block 53 by the process of step S170. Let the area write.

  That is, as shown in the lower part of FIG. 33, the file system information generation unit 402 supplies the file system information to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and The data is written in the area B202 ′ in the dedicated SRR 502.

  In step S174, the file system information generation unit 402 determines whether there is a free area for recording the volume structure information and the anchor information in the volume structure information and the anchor information dedicated SRR. Determine. In the upper case of FIG. 33, since it exists, the process proceeds to step S175.

  In step S175, the file system information generation unit 402 supplies the inner volume structure information and anchor information corresponding to the main FS to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72. The recording / playback block 53 is made to write the volume structure information and the anchor information retrieved by the processing of step S170 into the area in the dedicated SRR.

  That is, as shown in the lower part of FIG. 33, the file system information generation unit 402 sends the volume structure information and anchor information on the inner circumference side to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72. Then, the information on the volume structure on the inner circumference side on the recording medium 81 and the anchor information are written in the area B 201 ′ in the dedicated SRR 501.

  In step S177, the file system information generation unit 402 controls the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and mirrors FS (FS (FS ( MD-Mirror)), volume structure information, and anchor information are made unreadable from the recording medium 81 by the recording / reproducing block 53.

  That is, as shown in the lower part of FIG. 33, the file system information generation unit 402 performs mirror FS (FS (MD-Mirror)) recorded in the area B113 in the dedicated SRR 505 of the mirror FS (FS (MD-Mirror)). In addition, the volume structure information and the volume structure information and anchor information in the dedicated SRR 506 for anchor information are made unreadable from the recording medium 81 by the recording / playback block 53.

  In step S178, the file system information generation unit 402, in response to the process in step S177, performs a new outer mirror FS (FS (MD (MD-Mirror)) in the dedicated SRR of the outer mirror FS (FS (MD-Mirror)). -Mirror)) searches the nearest SA area or Use that can be recorded, and also searches the nearest SA area that can record volume structure information and anchor information.

  That is, in the case of the upper part of FIG. 33, the file system information generation unit 402 is made unreadable as the closest position where the new mirror FS in the dedicated SRR 505 of the mirror FS (FS (MD-Mirror)) can be recorded. The area B205 ′ adjacent to the area B205 in the dedicated SRR 505 is searched. Further, the file system information generation unit 402 sets the volume structure information, the new volume structure information in the dedicated SRR 506 for anchor information, and the dedicated SRR 506 that cannot be read as a position where the anchor information can be recorded. A region B206 ′ that is the SA region closest to the region B206 is searched.

  In step S179, the file system information generating unit 402 determines whether there is a free area for recording the mirror FS in the dedicated SRR of the mirror FS. In the upper case of FIG. 33, since it exists, the process proceeds to step S180.

  In step S180, the file system information generation unit 402 supplies the mirror FS to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and is searched by the recording / reproducing block 53 by the process of step S178. Let the area write.

  That is, as shown in the lower part of FIG. 33, the file system information generation unit 402 supplies the file system information to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and The data is written in the area B205 ′ in the dedicated SRR 505.

  Furthermore, in step S182, the file system information generation unit 402 supplies the volume structure information and anchor information on the outer peripheral side corresponding to the mirror FS to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72. Then, the recording / reproducing block 53 is written in the OSA area retrieved by the process of step S178.

  That is, in the case of the upper part of FIG. 33, the file system information generation unit 402 mirrors the information on the volume structure on the outer peripheral side corresponding to the mirror FS and the OSA area B206 ′ searched as a position where the anchor information can be recorded. Information on the volume structure on the outer peripheral side corresponding to the FS and anchor information are recorded.

  On the other hand, for example, as shown in the upper part of FIG. 34, when the main FS is recorded in the area B202 that is the entire area of the dedicated SRR 502 of the main FS, in step S169, as shown in the lower part of FIG. The entire area of the area B202 in which the FS is recorded cannot be read, and no area in which the new main FS can be recorded exists in the dedicated SRR 502. In such a case, in step S171, it is determined that there is no free area in which the new main FS can be recorded, and the process proceeds to step S173.

  In step S173, the file system information generation unit 402 supplies the main FS to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and writes it in the SA area at the nearest position by the recording / reproducing block 53. Make it.

  That is, as shown in the lower part of FIG. 33, the file system information generation unit 402 supplies the file system information to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and The data is written in the area B202 ′ in the ISA.

  Similarly, for example, as shown in the upper part of FIG. 34, information on the volume structure corresponding to the main FS, information on the volume structure corresponding to the main FS in the area B201 that is the entire area of the dedicated SRR 501 for anchor information, and If the anchor information has been recorded, in step S169, as shown in the lower part of FIG. 34, the entire area of the area B201 in which the main FS is recorded cannot be read, and the volume structure corresponding to the new main FS has been recorded. There is no free area in the dedicated SRR 501 in which information and anchor information can be recorded. In such a case, in step S174, it is determined that there is no free area in which the volume structure information and the anchor information corresponding to the new main FS can be recorded, and the process proceeds to step S176.

  In step S173, the file system information generation unit 402 supplies the inner peripheral volume structure information and anchor information corresponding to the main FS to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72. The data is written in the SA area closest to the recording / reproducing block 53.

  That is, as shown in the lower part of FIG. 34, the file system information generation unit 402 sends the volume structure information and anchor information on the inner circumference side to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72. Supplied and written in the area B201 ′ in the ISA on the recording medium 81.

  Furthermore, in step S179, for example, as shown in the upper part of FIG. 34, when the mirror FS information is recorded in the area B205 that is the entire area of the dedicated SRR 505 for the mirror FS information, in step S177, As shown in the lower part, the entire area of the area B205 in which the mirror FS is recorded cannot be read, and there is no free area in the dedicated SRR 505 in which information of the new mirror FS can be recorded. In such a case, in step S179, it is determined that there is no free area in which new mirror FS information can be recorded, and the process proceeds to step S181.

  In step S181, the file system information generation unit 402 supplies the mirror FS to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and the file system information is recorded at the closest position by the recording / reproducing block 53. Write to the SA area.

  That is, as shown in the lower part of FIG. 33, the file system information generation unit 402 supplies the mirror FS to the writing unit 73 via the ECC encoding unit 71 and the modulation unit 72, and the OSA on the recording medium 81 In the area B205 ′.

  32 will be described in detail later in each recording process in steps S163 to S168, S172, S173, S175, S176, and S180 to S182 in the flowchart of FIG.

  Through the above process, when a file is added or updated, the added or updated file system information, anchor information, and volume structure information update information are sequentially added to the dedicated SRR, or Since file system information, anchor information, and volume structure information before update are recorded as alternatives, file system information, anchor information, and volume structure information are sequentially recorded in physically different positions. Nevertheless, the information can be recorded on the recording medium without changing the logical addresses of the recorded file system information, anchor information, and volume structure information. Further, it is not necessary to rewrite logical addresses such as file system information, anchor information, and volume structure information every time a file is added or updated. As a result, even for recording media that cannot be overwritten at the same location, for example, write-at-once media, information that is obliged to be recorded at a fixed location on the logical address is processed as if it were overwritten. It can be handled as if

  Furthermore, data recorded when a file is added or updated is basically recorded in the User area in the dedicated SRR for each piece of information. When this happens, the SA area used can be saved, and the process of appending or updating the file is repeated, and there is no sufficient capacity in each dedicated SRR. In this case, since the SA area can be used, it is possible to effectively use the SA area for data recording processing while avoiding unnecessary consumption of the SA area.

  Next, the processing of steps S13 to S18, S21, S22, S25, and S26 in the flowchart of FIG. 17, the processing of steps S43 to S48, S50, S51, S54, and S55 in the flowchart of FIG. 20, and the flowchart of FIG. Steps S73 to S77, S79, S80, and S83, steps S103 to S109, S112 to S114, S117, and S118 in the flowchart of FIG. 26, steps S133 to S138, S141, S142, S145, and S146 in the flowchart of FIG. Details of the recording process of steps S163 to S168, S172, S173, S175, S176, S180 to S182 in the flowchart of FIG. 32 will be described.

  In each of the recording processes described above, replacement information consisting of a list of replacement source information and replacement destination information is generated as temporary DL (temporary DL) for each ECC cluster in the file to be overwritten or updated. Based on the alternative information management process and this temporary DL, the alternative source information and the alternative destination information are organized, and finally the final DL (hereinafter referred to as the final DL) recorded on the recording medium is recorded. This is divided into actual recording processing in which data is actually recorded on the recording medium 81 in units of clusters.

  First, the alternative information management process will be described with reference to the flowchart of FIG.

  In step S201, the alternative information management unit 63 determines whether there is an overwritten or updated cluster, and the process is repeated until it is determined that there is an overwritten or updated cluster. In step S201, for example, the process of recording the main FS in the SA area is executed by the process of step S21 in the flowchart of FIG. 17, so that the main FS recorded in the block B111 as an alternative source in FIG. However, if it is recorded in the block B111 ′ as an alternative destination, it is determined that there is an overwritten or updated cluster, and the process proceeds to step S202.

  In step S202, the replacement information management unit 63 confirms the position of the replacement source of data in a predetermined cluster unit constituting the data of the file to be overwritten or updated. For example, as shown in the upper part of FIG. 36, when the substitution source address is a cluster of A, the substitution source position A is confirmed. In the upper left part of FIG. 36, each cell indicates data of one cluster, A and B indicate addresses indicating the positions of the clusters, and one cell is indicated in the right direction in the drawing. The address is set so that the cluster address is incremented by 1 every time. Further, the hatched cluster indicates a cluster in which data is actually arranged, and the black cluster indicates a cluster in which no data is recorded.

  In step S203, the substitution information management unit 63 sets and stores the substitution destination position of the data in a predetermined cluster unit of the file data to be overwritten or updated. For example, as shown in the upper left part of FIG. 36, when the replacement destination position of a cluster whose replacement source position is A is B, data is stored in the replacement destination position B in the memory 63a.

  In step S204, the alternative information management unit 63 determines whether or not an error has occurred in the processing of step S203 described above. For example, if it is determined that no error has occurred, the processing is performed in step S205. Proceed to

  In step S205, the substitution information management unit 63 confirms the position of the substitution destination address.

  In step S206, the substitution information management unit 63 generates the DL generated in the memory 63a by the above-described formatting process based on the substitution source and substitution destination addresses of the cluster constituting the file data to be overwritten or updated. And the process returns to step S201.

  For example, in this case, the list is recorded as in the uppermost list in the upper right part of FIG. In the upper right part of FIG. 36, the head address of the substitution source, the head address of the substitution destination, and the cluster range are described from the left. In the uppermost part in the upper right part of FIG. 36, it is indicated that the start address of the replacement source is A and the start address of the replacement destination is B. The range is one, and the replacement is substantially performed. It is shown that one cluster from the beginning of the original A is replaced with a position corresponding to one cluster starting from the replacement destination B. In the case of the upper left stage of FIG. 36, the process of steps S202 to S206 is repeated four times, thereby generating a temporary DL as shown in the upper right part of FIG. That is, in the upper left and right of FIG. 36, data whose substitution source is one cluster from the beginning of the position of the address A + 1 is replaced with data for one class from the beginning of the position of the substitution destination address B + 1 by overwriting or updating. The data whose substitution source is one cluster from the beginning of the position of the address A + 2 is replaced with data of one class from the beginning of the position of the substitution destination address B + 2 by overwriting or updating, and the substitution source is the address A + 3 It is shown that the data that becomes one cluster from the head of the position is replaced with data for one class from the head of the position of the replacement destination address B + 3 by overwriting or updating.

  Furthermore, for example, in the case of the upper left and right states in FIG. 36, when only the data for one cluster at the location of the address A + 2 is overwritten as shown in the upper left portion of FIG. The original address is A + 2, and the substitution destination address is changed from B + 1 to D in step S203. As a result, in the upper right part of FIG. 37, the data for one cluster whose replacement source address is A + 2 at the top is the data for one cluster from the replacement destination address D (the vertical line in FIG. 37 is painted). It has been updated so that it can be replaced by a square.

  On the other hand, if it is determined in step S205 that an error has occurred, the process returns to step S203, and the subsequent processes are repeated. That is, as shown in the upper left part of FIG. 38, the data for one cluster starting from the replacement source address A + 2 is set to the position of one cluster starting from the address B + 2 as the replacement destination. When these temporary DL information is recorded on the memory 63a and an error occurs for some reason, a replacement destination is newly set again. In the case of FIG. 38, the replacement destination address is changed from B + 2 to C. Changed to As a result, as shown in the upper right part of FIG. 38, when the replacement source start address is A + 2, the replacement destination start address is changed to C (the cell painted with the grid lines in FIG. 38). .

  Through the above processing, a temporary DL composed of replacement source information and replacement destination information is generated in cluster units.

  Next, the actual recording process will be described with reference to the flowchart of FIG.

  In step S221, the alternative information generation unit 64 determines whether or not the control unit 51 has instructed recording of data on the recording medium 81. This recording instruction is, for example, when the capacity to be recorded in the memory 63a exceeds the limit capacity or when the above-described substitution management process is stopped (when the process of step S201 is repeated). And so on.

  When recording is instructed in step S221, in step S222, the replacement information generation unit 64 determines whether the replacement destination track (SRR) is in the same track, that is, the replacement destination track is different. It is determined whether it is a track (or SA area). For example, if it is determined that they are not the same track, the process proceeds to step S223.

  In step S223, the alternative information generation unit 64 determines whether or not the size of the file to be overwritten or updated is larger than the size of the original file, and if it is determined that it is not larger The process proceeds to step S225.

  In step S225, the alternative information generation unit 64 inquires of the alternative information management unit 63 and determines whether or not the cluster information recorded in the temporary DL is continuous. For example, as shown in the upper left and right of FIG. 36, when the address of the start position of the replacement source cluster is A to A + 3 and the address of the start position of the replacement destination cluster is B to B + 3, respectively. Since the replacement destination addresses are continuously arranged for each cluster, it is determined that the DL arrangement is continuous, and the process proceeds to step S227.

  In step S227, the alternative information generation unit 64 generates and records the final DL in a state where the alternative destinations are collected in one place on another track in the memory 64a. That is, based on the description of the temporary DL as shown in the upper right part of FIG. 36, as shown in the lower left part of FIG. As shown in the lower right part of FIG. 36, the replacement source start address is A, and the replacement destination start address is B, as shown in the lower right part of FIG. , The range is recorded as 4. In this way, the temporary DL information consisting of the cluster-by-cluster substitution source and substitution destination information is converted into substitution source and substitution destination information for multiple consecutive clusters, thereby generating a final DL with a smaller temporary DL. And stored in the memory 64a.

  Further, in step S228, the alternative information generation unit 64 causes the recording unit 52 to write data to the recording medium 81 based on the final DL stored in the memory 64a, and also outputs the final DL to the recording medium 81. Let the top record.

  Since the final DL is generated based on the temporary DL information in this way, the number of lists can be reduced, and the recording capacity of the DL (final DL) recorded on the recording medium 81 can be reduced. Thus, the capacity of the recording medium 81 consumed by overwriting or updating can be saved.

  In step S225, for example, as shown in FIG. 37 or FIG. 38, when the temporary DL is recorded, it is determined that the clusters are not continuously arranged. That is, for example, in FIG. 37, the ranges for each cluster starting from the replacement destination addresses B and B + 1 corresponding to the replacement source addresses A and A + 1 are continuous, but the replacement source addresses A + 2 and A + 3 The address of the alternative destination corresponding to is a range for one cluster starting from D and B + 3, respectively, and the clusters are not continuous. For this reason, in step S225, it determines with it not being continuous, and the process progresses to step S226.

  In step S226, the substitute information generating unit 64 continuously rearranges a plurality of substitute destination addresses based on the temporary DL information. That is, for example, as shown in the lower left part of FIG. 37, the data of the cluster in which the replacement source addresses are continuously arranged in the range of A to A + 3 has the replacement destination addresses continuous in the range of D to D + 3. Therefore, it is possible to arrange them continuously. As a result, in step S227, which is the subsequent process, it is possible to generate a final DL that is configured to be collected in one place on another alternative track. In the lower right part of FIG. 37, a final DL is generated indicating that the substitution source is 4 clusters from the position where the start address is A and the substitution destination is 4 clusters from the position where the start address is D. Will be.

  As a result, similarly to the above, it is possible to save the capacity of the recording medium 81 consumed by overwriting or updating.

  Furthermore, when it is determined in step S223 that the file composed of a plurality of substitution source clusters has been enlarged by overwriting or updating, the substitution information generating unit 64 obtains data corresponding to the size of the file that has been enlarged by the overwriting process. Record the constituent clusters continuously in the alternative source.

  That is, as shown in the upper part of FIG. 40, the substitution source file A is recorded in the range of addresses A to A + 3, and the file A ′ generated by overwriting this file A is shown in the middle left part of FIG. As shown in the figure, when the size is increased by one cluster starting from the address A + 4 (cluster indicated by the grid in FIG. 40), the alternative information generating unit 64 uses the one cluster starting from the address A + 4. Minutes of overwritten data are recorded after the substitute data.

  In summary, when the replacement destination is not the same track but another track or the SA area as described above, as shown in the lower part of FIG. 40, the logical area is indicated by the area R1. The addresses A to A + 4 are continuous ranges, and there are two physical recording areas, areas R2-1 and R2-2. Therefore, when the file A is read from the recording medium 81, it is read in the order of the areas R2-1 and R2-2, so that it is necessary to physically read it in the direction opposite to the recording direction. As a result, when the replacement destination is not the same track, logical addresses are continuous, so that the processing on the file system is easy to manage. However, in this case, physically, the arrangement of the clusters is not continuous, and the reading order is changed, so that reading of the file cannot be realized at high speed.

  On the other hand, if the alternative destination is in the same track in step S222, the processing of steps S225 to S227 is executed in steps S229 to S231, and further, the processing of steps S223 and S224 is executed in steps S232 and S233. . That is, the processing order is switched. However, in step S233, the cluster data corresponding to the size of the file is continuously recorded in the data recorded in the alternative destination.

  That is, if the replacement destination is the same track, the replacement destination is in the same track, and therefore, as shown in the middle part of FIG. 41, four clusters starting from address B that are consecutive positions with respect to the replacement source Area (4 clusters area starting from address B (= A + 4)), and when overwritten or updated at the continuous address B + 4 position, the larger cluster area (in the figure) Lattice grids) are recorded.

  In summary, when the replacement destination is the same track as described above, as shown in the lower part of FIG. 41, the logical area includes the range of addresses A to A + 3 indicated by area R1-1, It is shown in two places with the range of the address B + 4 shown by R1-2, and it becomes one place of the area R2 as a physical recording area. On the other hand, as shown in the lower part of FIG. 41, when the file A is read from the recording medium 81, since the region R2 can be read continuously, it is physically easy to read in the recording direction.

  As a result, when the replacement destination is the same track, the logical address is divided and difficult to manage in the processing on the file system, but physically, the arrangement is continuous. Therefore, file reading can be realized at high speed.

  The final DL in the right middle part of FIGS. 40 and 41 is the same in that the substitution source is an area for 4 clusters from address A, and the corresponding substitution destination is for 4 clusters from address B. . However, the address B is not in the same track in FIG. 40 but in the same track in FIG.

  That is, whether or not the alternative destination is in the same track has advantages and disadvantages as described above, and it is necessary to use them properly according to the application. For example, in the case where, for example, moving image data, audio data, or the like in which information of a file to be recorded has a time constraint on reproduction, it is desirable to record the replacement destination in the same track. On the other hand, it is better not to use the same track as the replacement destination in order to facilitate the management of the data without any restriction on the reproduction time of the database or the like.

  Furthermore, the difference in whether or not the replacement destination is within the same track is caused by a contradiction between the logical arrangement and the physical arrangement, but is recorded if recording is performed so as to eliminate these contradictions. The file may be in any data format.

  For example, if no replacement information management process is performed and a file instructed to be overwritten is recorded in a new area, the logical arrangement and the physical arrangement match.

  FIG. 42 is a flow chart for explaining the actual recording process when no replacement process management process is performed and the overwritten file is sequentially recorded in a new area.

  In step S261, the file system information generation unit 62 determines whether overwriting or updating of a new file has been instructed, and repeats the processing until instructed. When overwriting or updating is instructed, in step S262, the file system information generating unit 62 records a file overwritten or updated in a new area.

  That is, as shown in the upper part of FIG. 43, when the original file A is recorded in the range of addresses A to A + 3, when the file A is overwritten or updated as the file A ′, As shown in the left middle part, the file A ′ is overwritten or updated in the range of addresses B to B + 4 continuous to the area where the file A was recorded, so that it is shown in the lower part of FIG. As described above, since the area R1 indicating the logical arrangement is the same as the area R2 indicating the physical arrangement, no contradiction occurs, and management and reproduction of any type of file is easy. Therefore, the reading speed can be increased. In this case, since the file to be updated or overwritten is updated or overwritten with both the logical address and the physical address, registration to the DL is not performed as shown in the middle right part of FIG. Not needed (no alternative source, alternative destination, and range information).

  Next, actual recording processing when the recording medium 81 is loaded will be described with reference to the flowchart of FIG. In the actual recording process when the recording medium 81 is mounted, the DL recorded on the recording medium 81 is recorded in the form of a temporary DL as described in cluster units, and the replacement destination addresses are continuous. In the case where the recording medium 81 is not put together, it is a process of reading and collecting the recording medium 81 when the recording medium 81 is loaded. In the flowchart of FIG. 44, the processing of steps S262 to S269 is the same as the processing of steps S222 and S225 to S231 in the flowchart of FIG.

  That is, in step S261, the process is repeated until the recording medium 81 is loaded. When the recording medium 81 is loaded, the processes in steps S262 to S269 are executed.

  For example, as shown in the upper left and right of FIG. 45, in the upper temporary DL, the replacement destination corresponding to the replacement source for one cluster starting from the position of address A is one cluster starting from the position of address B. The substitution destination corresponding to the substitution source for one cluster starting from the position of address A + 1 is the range of one cluster starting from the position of address B + 1, and the position of address A + 2 is the beginning. The replacement destination corresponding to the replacement source for one cluster is a range for one cluster starting from the position of address B + 2, and the replacement destination corresponding to the replacement source for one cluster starting from the position of address A + 3 is , The range of one cluster starting from the position of address B + 3. Therefore, since the information is in units of clusters, it is necessary to attach a list that constitutes the DL for each cluster, and the DL becomes large.

  However, due to the actual recording process when the recording medium 81 is mounted as described with reference to the flowchart of FIG. 44, in the lower DL of FIG. 45, the substitution corresponding to the substitution source for four clusters starting at the position of the address A The destination indicates a range corresponding to four clusters starting from the position of the address B, and is indicated as one list (one piece of information that is a combination of substitution source, substitution destination, and range information). As a result, the information constituting the DL can be reduced. Also, with this processing, even if the recording medium 81 on which information is recorded by the recording / reproducing apparatus that does not have the function of reducing the DL as described with reference to the flowchart of FIG. Therefore, the storage capacity consumed by the DL recording in the subsequent processing can be saved.

  According to the present invention, when adding or updating a file, the User area or SA area is used as an alternative sector, so file system information, anchor information, volume structure information, and stream Data that is required to be recorded in a fixed location on the logical address of the data database file, and reading after the update can be easily performed. At this time, the file system information, anchor information, volume structure information, and stream data database file are selectively recorded in the SA area, thereby reducing the consumption of the SA area capacity. Can be made. Furthermore, even when updating files frequently, there is no need to re-lay out and record the updated files again. For example, when adding or updating data on write-at-once media, etc. It becomes possible to save the required recording capacity. In addition, by using both the User area and SA area to record the information of files that have been overwritten or updated using the User area and SA area as an alternative to the information before being overwritten or updated, the SA area used area is recorded. It is possible to save. Further, when data is recorded, the list in the final DL can be reduced by continuously arranging the clusters of the temporary DL, so that the final DL recorded on the recording medium 81 can be used. it can.

  Next, the SA area setting process, which is the process of step S1 described with reference to the flowchart of FIG. 14, will be described with reference to the flowchart of FIG.

  In step S291, the initialization unit 62a of the file system information generation unit 62 of the control unit 51 controls the writing unit 73 to secure an SA (Spare Area) area on the recording medium 81 for the recording / playback block 53. To do.

  In step S292, the initialization unit 62a determines whether or not the logical overwriting is set when the recording medium 81 after formatting is used. The setting with logical overwriting or the setting without logical overwriting may be set by the user in advance, or at the stage before the start of formatting, that is, immediately before the processing of step S292 is started. A selection screen for inquiring whether or not to enable the logical overwriting function to the user may be displayed, and the presence or absence of logical overwriting may be determined based on the selection result. Furthermore, it may be set as an option of the format command.

  For example, if it is determined in step S292 that the logical overwriting is set, in step S293, the initialization unit 62a sets the first ratio of the SA (Spare Area) area to the TDMA area.

  On the other hand, if it is determined in step S292 that the logical overwriting is not set, that is, the logical overwriting is not set, in step S294, the initialization unit 62a selects the SA (Spare Area) area. A second ratio smaller than the first ratio is set in the TDMA area.

  In other words, when the logical overwrite function is used, it is expected that the physical information (track management data or alternative information) on the recording medium will frequently be updated, so the TDMA usage area is expected to increase. The Therefore, when the logical overwriting function is used, for example, as shown in the upper part of FIG. 47, 50% is set in the TDMA area as the first ratio of the SA area. On the other hand, when the logical overwrite function is not used, for example, as shown in the lower part of FIG. 47, 25% is set in the TDMA area as a second ratio smaller than the first ratio in the SA area.

  In the upper part of FIG. 47, 50% of the ISA shown in the range L1 is set as the TDMA region in the ISA, and 50% of the OSA shown in the range L1 ′ is set as the TDMA region. % Area is set as TDMA area. In the lower part of FIG. 47, 25% of the ISAs in the ISA indicated by the range L2 is set as the TDMA region, and 25% of the OSAs indicated by the range L2 ′ is set in the TDMA region. The area is set to the TDMA area.

  Therefore, for example, when ISA is 256 MB, the TDMA area of ISA is 128 MB when logical overwriting is performed, and the TDMA area of ISA is 64 MB when logical overwriting is not performed. On the other hand, for example, when OSA is 512 MB, the OSA TDMA area is 256 MB when logical overwriting is performed, and the OSA TDMA area is 128 MB when logical overwriting is not performed.

  Through the processing as described above, it becomes possible to set a TDMA area corresponding to the presence or absence of logical overwriting. Therefore, when using the recording medium 81 using the logical overwriting function, physical information is repeatedly updated. It is possible to execute such processing.

  By the way, it is conceivable that the SRR set as the recording area of the FS becomes full when the update of the FS is repeated by the processing as described above. In such a case, an unused area is divided to newly set an area for recording an FS, and a new FS recording area is secured (division processing will be described later). However, when the FS recording area is divided in this way, when a plurality of files are read at a high speed, the reading process may be delayed. In addition, if the alternative management information managed by TDMA exceeds a predetermined size, the TDMA area is consumed greatly for each update, and the TDMA area may be used up with a small number of updates. In view of this, the arrangement of the FS may be optimized so that reading or writing can be performed at high speed.

  FIG. 48 shows a configuration of the recording / reproducing mechanism unit 22 that can execute the FS recording area optimization process.

  In the recording / reproducing mechanism unit 22 in FIG. 48, the same reference numerals are given to the components corresponding to those of the recording / reproducing mechanism unit 22 in FIG. 3, and the description thereof will be omitted as appropriate.

  48 differs from the recording / reproducing mechanism 22 in FIG. 3 in that a controller 421 is provided in place of the controller 51. The control unit 421 is different in that an optimization unit 431 is newly provided in addition to the function of the control unit 51.

  The optimization unit 431 logically and physically optimizes the FS when the TDMA usage area in the SA area of the recording medium 81 is greater than or equal to a predetermined capacity.

  The FS optimization unit 431a of the optimization unit 431 executes optimization processing (logical area) in the FS layer of information recorded on the recording medium 81. The physical layer optimization unit 431b performs optimization processing in the physical layer of information recorded on the recording medium 81.

  When there is no recordable area in the FS SRR, the dividing unit 431c divides the unused area in the SRR of the recording medium 81 into an area for recording a new FS and an area for recording a file. To do. This division processing is performed at a timing different from the optimization processing, and details of the division processing will be described later.

  Next, the optimization process will be described with reference to the flowchart of FIG.

  In step S <b> 311, the optimization unit 431 controls the reading unit 91 to use the capacity of the used area (currently latest alternative management information) of the TDMA area in the SA area on the storage medium 81, and the FS. Read unused area of SRR for.

  In step S312, the optimization unit 431 determines whether or not the used capacity in the TDMA area is equal to or greater than a predetermined capacity. For example, if the latest TDMA replacement management information is not the predetermined capacity, the processing is performed. Returns to step S311. That is, the processes of steps S311 and S312 are repeated until it is determined that the used capacity (latest replacement management information) in the TDMA area is equal to or greater than a predetermined capacity.

  In step S312, for example, when it is determined that the used area in the TDMA area is greater than or equal to a predetermined capacity, in step S313, the FS layer optimization unit 431a reads FSs of a plurality of FS layers.

  That is, for example, as shown in the upper part of FIG. 50, it is assumed that FS is logically recorded in area B301 and file information (Files in the figure) is recorded in area B302. In this state, as shown in the lower part of FIG. 50, new file information is logically recorded in the area B303, and the update information of the file information recorded in the area B302 is used as an alternative area in the area B302 ′. When the recordable area disappears in the SRR for FS due to the area 301 that is the FS area and the area B301 ′ in which the replacement information is recorded, the area B302 is recorded in the SRR of the SRR in which the area B302 is recorded. The unused area is divided by a division process described later to generate an SRR consisting of a new FS area and an SRR consisting of a file recording area, and an FS is added to the area B301 ″ as an additional file (stream in the figure) Are added to area B304. Note that NWA in the figure indicates a new writable area, and a new FS or file is recorded from the position where the NWA of each area is written.

  For example, in the case shown in the lower part of FIG. 50, the FS layer optimization unit 431a performs the divided regions B301, B301 ″ as shown in the upper part of FIG. 51 (the same figure as the lower part of FIG. 50). Read multiple FS recorded in. In the figure, the black portion indicates the area where the FS or file is recorded, and the hatched portion indicates the area where the alternative recording is performed.

  In step S314, the FS layer optimizing unit 431a combines the read FSs recorded in the divided areas B301 and B301 ″ into 1 (combines them into 1 FS), and FIG. As shown in the lower part of FIG.

  That is, when reading a stream file, it is necessary to read the stream file after reading the divided FS recorded in the areas B301 and B301 ″ as the FS read first, as shown in the upper part of FIG. For this reason, it may take time to read the stream file. However, since the FS layer is optimized by recording logically in the FS layer by processing as described above, the FS can be read at a time, and the reading speed is increased. In addition, the writing speed can be increased.

  In step S315, the physical layer optimization unit 431b reads the FS recorded in a physically dispersed state on the recording medium 81.

  That is, as shown in the upper part of FIG. 52, in the physical area on the recording medium 81, when FS is recorded in the area B321 and file information (Files in the figure) is recorded in the area B322, in the lower part of FIG. As shown, the file information is newly recorded in the area B323 or the file recorded in the area B322 is updated, and the replacement information is recorded in the area B332, so that the FS is updated and the area B321 is updated. It is assumed that the information of the area B321 ′ is recorded as the replacement information in the area B331 ′ in the ISA, and the information of the area 321 ″ of the area 321 is recorded as the replacement information in the area B331 ′.

  In step S315, the physical layer optimizing unit 431b is distributed as areas B321, B331 ′, and B331 ″ in the case of the upper part of FIG. 53 (the same figure as the lower part of FIG. 52), for example. Read all FS recorded in.

  In step S316, the physical layer optimization unit 431b generates one FS in which the read FSs recorded in a physically dispersed state are collected (combined with one FS) and records the FS.

  That is, the physical layer optimizing unit 431b collects FSs recorded in a distributed state such as regions B321, B331 ′, and B331 ″ shown in the upper part of FIG. 53, and is shown in the middle part of FIG. As described above, recording is performed in the area B341. As a result, since the FS is physically recorded collectively, the file reading speed can be improved.

  In step S317, the physical layer optimization unit 431b confirms that one FS in which a plurality of FSs recorded in the physically dispersed state is recorded is recorded, and then the physical layer optimization unit 431b. Supplies the update block command to the alternative information generation unit 64 to the optimization unit 431.

  In step S318, the substitute information generating unit 64 updates the substitute information X based on the updateblock command, and records new substitute information X ′ in the TDMA area. In other words, since the area where FS is physically recorded is recorded in one continuous area, there is virtually no information to be managed by DL, so the substitute information itself becomes smaller. (Alternative information X ′ in the lower part of FIG. 53 is a smaller file than alternative information X in the middle part of FIG. 53). For this reason, even if a file is updated or added after this processing, the replacement information updated on the TDMA can be reduced, so that the consumption of the TDMA area can be reduced.

  With the above optimization process, the FS recording areas in the FS layer and physical layer are combined into one, so the number of TDMA accesses can be reduced, and the file information read and write speeds are improved. In addition, since the replacement information becomes smaller, it becomes possible to reduce the TDMA consumption area by adding or updating the subsequent files.

  As a result, the following processing becomes possible. That is, for example, as shown in the upper part of FIG. 54, the first FS is recorded in the area B381, and further, the SRR of the first FS is used up in the state where the FS is updated and recorded in the area B382. FS is recorded in the area B386. Further, the file information is recorded in the areas B383 and B384, and after being recorded in the area B384, the file recorded in the area B383 is updated and is recorded as a substitute in the area B385, and further, the additional file information is added to the area B387. When (additional Files (stream)) is recorded, the processing in steps S313 and S314 causes the region B401 to be added to the region B401 in the FS layer as shown in the middle part of FIG. The FS recorded in B386 is collected and recorded.

  Further, as shown in the lower part of FIG. 54, the processing of steps S315 to S318 physically records the FS and records the replacement information Y recorded in the TDMA with a smaller capacity. Information Y ′ is updated and recorded.

  As a result of the above processing, the number of times of reading the alternative information recorded in the TDMA is reduced, the number of accesses to the TDMA is reduced, the file reading speed and the writing speed on the recording medium 81 are increased, and the TDMA Therefore, when the file information is added or updated, the area consumed in the TDMA can be reduced by the replacement information added to the TDMA area.

  Next, the division process will be described with reference to the flowchart of FIG.

  In step S331, the dividing unit 431c determines whether or not there is no unrecorded area in the SRR (track) set for FS, that is, whether or not the SRR is full, and is not recorded in the SRR. This process is repeated until it is determined that the area is no longer present.

  For example, as shown in the upper part of FIG. 56, from the state where the FS is recorded in the area B501 and the file information (Files) is recorded in the area B502, the file information is added and recorded in the area B503. Alternatively, the file information recorded in the area B502 is updated and recorded in the area B502 ′ as a substitute, so that the FS is updated, the area B501 ′ is consumed, and the SRR # 2 set for the FS is full. In step S331, it is determined that there is no unrecorded area in the SRR (track) set for FS, and the process proceeds to step S332.

  In step S332, the dividing unit 431c divides the SRR of the unused area, and in step S333, sets the area for FS and the area for File in each divided SRR, and the processing returns to step S331.

  That is, in the middle part of FIG. 56, as shown in the lower part of FIG. 56, SRR # 3 for recording file information is divided, SRR # 4 is set as a FS track, and SRR # 5 is set as file information. Set to recording track (File track).

  There are several methods for dividing SRR.

  The first method is based on the command Reserve (A, B). This command is, for example, a developed command that designates an area of size A by Reserve (A) as a reservation command for the used area. In this method, the area is reserved by size A and size B.

  As a second method, a split (X, A) command that is a split command is used. The Split (X, A) command is a command for instructing to divide the X track (SRR # X) into an area of size A and the remaining area. By this command, the designated track is divided into two.

  That is, for example, as shown in FIG. 57, it is assumed that a recorded area B531 exists in the SRR (Track # n) in the Open state (Open Reserved Track (Track # n)). 56 corresponds to the area obtained by combining the areas B502, B503, and B502 ′ in the middle of FIG. 56).

  In the case of the upper part of FIG. 57, the track n (Track #n) is divided by Split (n, A) as shown in the middle part of FIG. That is, the track n is a size A track n (Open Reserved Track (Track # n)) (an area 532 composed of an area B531 and an area B541) and a track (n + 1) (Open Reserved Track (Track # n + 1)). )) (Region B533). Accordingly, in the lower part of FIG. 56, the area 541 is assigned to the FS track, and the area B521 is assigned to the File track. However, in this case, the area 541 is the same track as the area 531 and recording is continued from the recorded area 531.

  The third method is a method using a Split (X, A, B) command, which is a developed split command of the second method. The Split (X, A, B) command is a command for instructing to divide the X track (SRR # X) into a size A region, a size B region, and the remaining region. With this command, the designated track is divided into three.

  As a fourth method, a Split ′ (Y, A) command that applies the split command of the second method is used. The Split '(Y, A) command is a command for instructing to divide the SRR # Y (track Y) area into a used area, a size A area, and the remaining area. With this command, the designated track is divided into three.

  In the case of the upper part of FIG. 57, the track n (Track #n) is divided by Split ′ (n, A) as shown in the lower part of FIG. That is, the track n is a used track n (Closed Track (Track # n)) (area 531), a track of size A (n + 1) (Open Track (Track # n + 1)) (area B551), and a track ( n + 2) (Open Track (Track # n + 1)) (area B552). Therefore, in the lower part of FIG. 56, the area 551 is assigned to the FS track, and the area B552 is assigned to the File track.

  However, as shown in the middle part of FIG. 56, in the Split command, the track before splitting and the track after splitting (SRR) are both open, but in the Split 'command, the recorded area is closed. It becomes a state.

  Further, as a fifth method, a Split ′ (Y, A, B) command, which is a split command of an extension of Split ′ (Y, A), is used. The Split '(Y, A, B) command is a command for instructing to divide the Y track (SRR # X) into a recorded area, an area of size A, an area of size B, and the remaining area. is there.

  In the above commands, A and B are parameters for specifying the size, but they may be commands indicating the position where division is started. The Split 'command can specify a large number of divisions with fewer parameters than the Split command. As a result, even if the number of bits that can be used for the command is minimized, it can be used effectively. In the above, an example of a command that divides SRR into four at maximum is shown, but a command that divides SRR into a larger number may be used by the same method as the above-described command.

  With the above processing, even if the SRR set for the FS is used up, a new SRR for the FS can be set.

  In the above, the area for recording the main FS has been described. However, even when the area for recording the mirror FS is set, it can be newly set by the same method.

  Here, the division processing for the mirror FS will be described with reference to the flowchart of FIG.

  In step S351, the dividing unit 431c determines whether there is no unrecorded area in the SRR (track) set for the mirror FS, that is, whether the SRR is full. This process is repeated until it is determined that there is no recording area.

  For example, as shown in the upper part of FIG. 59, the FS is recorded in the region B571, the file information (Files) is recorded in the region B572, and the mirror FS is recorded in the region B573. As described above, the file information is added to the area B581 and recorded, so that the FS is updated, the area B571 ′ is consumed, the mirror FS is updated, the area B573 ′ is consumed, and the mirror FS is used. If the set SRR # 4 is full, it is determined in step S351 that there is no unrecorded area in the SRR (track) set for the mirror FS, and the process proceeds to step S352.

  In step S352, the dividing unit 431c divides the SRR of the unused area, and in step S353, sets the area for mirror FS and the area for File in each divided SRR, and the processing returns to step S351. .

  That is, in the case of the middle part of FIG. 59, as shown in the lower part of FIG. 59, SRR # 3 for recording file information is divided, SRR # 4 is set as a mirror FS track, and SRR # 3 is not yet recorded. The use area is set as a file information recording track (File track).

  The SRR dividing method in this case is the same as that described above, but the region set in the mirror FS is preferably set to be a position close to the SRR for the mirror FS.

  Further, if the dedicated areas of the main FS and the mirror FS have the same size, there is a possibility that the recordable area may be lost at the same time. In such a case, the unused area may be divided into four tracks by the above-described command, and may be divided into a recorded area, a file area, a main FS area, and a mirror FS area. If the mirror FS area is set to a position close to the original mirror FS area, it is possible to suppress a decrease in reading and writing speed.

  With the above processing, even if the SRR set for the mirror FS is used up, a new SRR for the mirror FS can be set.

  The series of processes described above can be executed by hardware, but can also be executed by software. When a series of processes is executed by software, a program constituting the software may execute various functions by installing a computer incorporated in dedicated hardware or various programs. For example, it is installed from a recording medium in a general-purpose personal computer.

  As shown in FIG. 2, the recording medium on which the program is recorded is distributed to provide the program to the user separately from the computer, and a magnetic disk 41 (including a flexible disk) on which the program is recorded, By a package medium comprising an optical disk 42 (including compact disc-read only memory (CD-ROM), DVD (digital versatile disk)), a magneto-optical disk 43 (including MD (mini-disc)), or a semiconductor memory 44 In addition to being configured, it is configured by a ROM 12 on which a program is recorded and a hard disk included in the storage unit 18 provided to the user in a state of being incorporated in a computer in advance.

  In this specification, the step of describing the program recorded on the recording medium is not limited to the processing performed in time series in the order described, but of course, it is not necessarily performed in time series. Or the process performed separately is included.

  22 recording / playback mechanism unit, 51 control unit, 52 recording unit, 53 recording / playback block, 54 playback unit, 61 file system information recognition unit, 62 file system information generation unit, 63 alternative information management unit, 63a memory, 64 alternative information generation Section, 64a memory, 71 ECC encoding section, 72 modulation section, 73 writing section, 81 recording medium, 91 reading section, 92 demodulation section, 93 ECC decoding section, 301 file system information recognition section, 302 file system information generation section , 303 Alternative information management unit, 303a memory, 304 Alternative information generation unit, 304a memory, 311 File system information recognition unit, 312 File system information generation unit, 313 Alternative information management unit, 313a memory, 314 Alternative information generation unit, 314a memory , 331 control unit, 341 file system information recognition unit, 342 file system information generation unit, 343 alternative information management unit, 343a memory, 344 alternative information generation unit, 344a memory, 351 control unit, 361 file system information recognition unit, 362 file System information generation unit, 363 substitution information management unit, 363a memory, 364 substitution information generation unit, 364a memory, 371 control unit, 381 file system information recognition unit, 382 file system information generation unit, 383 substitution information management unit, 383a memory, 384 alternative information generation unit, 384a memory, 391 control unit, 401 file system information recognition unit, 402 file system information generation unit, 403 alternative information management unit, 403a memory, 404 alternative information generation unit, 404a memory, 431 optimization unit, 431a FS layer optimization unit, 431b physical layer optimization unit, 431c division unit

Claims (4)

Securing means for securing an alternative information recording area on the recording medium;
In the case of logical overwriting, in the case of no logical overwriting, in the TDMA area where information managed by the defect list that associates the position of the substitution source and the position of the substitution destination set in the substitution information recording area is recorded. An information recording apparatus comprising: setting means for setting the TDMA area at a rate larger than the rate. A securing step for securing an alternative information recording area on the recording medium;
In the case of logical overwriting, in the case of no logical overwriting, in the TDMA area where information managed by the defect list that associates the position of the substitution source and the position of the substitution destination set in the substitution information recording area is recorded. A setting step of setting the TDMA area at a rate larger than the rate. A securing control step for controlling securing of the alternative information recording area on the recording medium;
In the case of logical overwriting, in the case of no logical overwriting, in the TDMA area where information managed by the defect list that associates the position of the substitution source and the position of the substitution destination set in the substitution information recording area is recorded. And a setting control step for controlling the setting of the TDMA area at a rate larger than the rate. A program storage medium storing a computer-readable program. A securing control step for controlling securing of the alternative information recording area on the recording medium;
In the case of logical overwriting, in the case of no logical overwriting, in the TDMA area where information managed by the defect list that associates the position of the substitution source and the position of the substitution destination set in the substitution information recording area is recorded. A program for causing a computer to execute processing including a setting control step for controlling setting of the TDMA area at a rate larger than the rate.

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