JP3562486B2 - Recording method, recording apparatus, and recording medium - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a recording method for recording data on a rewritable recording medium, and more particularly to a recording method that enables a drive device to recognize a file structure at high speed even when data is additionally recorded. The present invention also relates to a recording device using the recording method and a recording medium on which data is recorded by the recording method.
[0002]
[Prior art]
In recent years, high-density optical discs represented by DVDs (Digital Versatile Discs) have been developed, and standards have been standardized. As a result, UDF (Universal Disk Format) was formulated. A rewritable DVD-RAM (DVD-Random Access Memory) uses a logical format according to the UDF. The UDF can be applied to a writable CD-R or a rewritable CD-RW.
[0003]
The UDF is configured by a hierarchical file system, and refers to sub directories and substantial files from information stored in a root directory. In the UDF, a reference to another sub directory or a reference to a substantial file is made from the information stored in the sub directory. Hereinafter, the directory is abbreviated as "Dir."
[0004]
That is, the recording area on the disk is accessed with a sector as a minimum unit. For example, in a DVD-RAM, access is made from the inside to the outside of the disk. From the innermost side, a system area in which volume information is written is arranged following the lead-in area, where a VRS (Volume Recognition Sequence), a MVDS (Main Volume Descriptor Sequence), an LVIS (Logical Volume Inventory) and an LVIS (Logical Volume Inventory) are provided. (Anchor Volume Descriptor Pointer) is written.
[0005]
Root Dir. Of the recording area where the file entry (File Entry, hereinafter abbreviated as “FE”) is written is recognized by sequentially referring to MVDS and FSD from AVDP. The FE includes attribute information of a file or directory and an allocation descriptor (hereinafter, abbreviated as “AD”). AD is information on logical addresses and sizes of files and directories.
[0006]
Root Dir. In the FE of AD, the root Dir. Are shown. Root Dir. Includes one or a plurality of file identification descriptors (File Identifier Descriptor, hereinafter abbreviated as “FID”), and the root Dir. The sub-Dir. Of the file or the FE of the file. By these FEs, the corresponding sub-Dir. And the entity of the file is referred to by each AD. Also, the sub Dir. May further include one or more FIDs. That is, in the UDF, the root Dir. Otherwise, access is performed in the order of FID, FE, and entity using FID and FE as pointers. In UDF, the FID, FE, and entity may be written anywhere in the recordable area.
[0007]
For example, a lead-in area is arranged on the innermost periphery of the disc, and a system area is arranged on the outer periphery of the lead-in area. Root Dir. Is disposed outside this system area, for example.
[0008]
Root Dir. From Sub Dir. The case where a file is accessed via a. That is, the root Dir. Of the root Dir. Sub Dir. Located at an address physically distant from the entity of Is referred to. Further, the sub Dir. Based on the FE AD of the sub-Dir. Of the sub-Dir. Is referred to. Similarly, the sub-Dir. Of the sub Dir. The FE of the file located at an address away from the entity of the file is referred to, and the AD of the FE of the file refers to the entity of the file located at an address away from the FE of the file.
[0009]
As described above, conventionally, when information on directories and files is scattered on a disk, it takes time to read the information. Therefore, for example, it is conceivable to collectively record pointer information such as FID and FE in a predetermined area of the disc.
[0010]
[Problems to be solved by the invention]
However, even in this case, a file may be written next to a free address generated when a corresponding FE or the like is deleted on the disk, for example, as the file is deleted. When such a situation occurs, there is a problem that the pointer information and the like recorded collectively at the beginning are divided, and it takes a long time to read the directory and file information.
[0011]
Therefore, an object of the present invention is to provide a recording method and apparatus capable of always accessing at high speed without dividing the pointer information at the time of file access, and recognizing an area where the pointer information is recorded, and a recording method. To provide a medium.
[0012]
[Means for Solving the Problems]
In the present invention, in a recording method for recording data on a disk-shaped recording medium based on a hierarchical file system, management information for managing a hierarchical structure of the file system is recorded in a specific area of the disk-shaped recording medium, The unused area in the area is treated as a special file, and information on the initial location and size in the special file and information on the current location and size in the special file are recorded in the specific area. It is constituted by doing so.
[0013]
According to the present invention, in a recording device that records data on a disc-shaped recording medium based on a hierarchical file system, means for recording management information for managing a hierarchical structure of the file system in a specific area of the disc-shaped recording medium, Means for treating an unused area in the specific area as a special file; and information on an initial location and size in the special file and information on a current location and size in the special file. Means for recording in a specific area.
[0014]
Further, according to the present invention, in a recording medium for recording data on a disk-shaped recording medium based on a hierarchical file system, management information for managing a hierarchical structure of the file system is recorded in a specific area of the disk-shaped recording medium, The unused area in the area is treated as a special file, and information on the initial location and size in the special file and information on the current location and size in the special file are recorded in the specific area. It consists of what was done.
[0015]
Thus, in the present invention, when data is recorded on a disc-shaped recording medium based on a hierarchical file system, management information for managing the hierarchical structure of the file system is recorded in a specific area of the disc-shaped recording medium, Since the unused area in the specific area is treated as a special file, an area to which management information for managing the hierarchical structure of the file system is added is reliably secured in the specific area. For this reason, the hierarchical structure of the file system can be read at a high speed, and the reproduction start time can be reduced as compared with the related art.
[0016]
Further, in the present invention, the information on the initial location and size in the special file and the information on the current location and size in this special file are recorded in the specific area. Can be reliably recognized.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same components are denoted by the same reference numerals.
[0018]
FIG. 1 is a schematic diagram showing a logical format of a disk-shaped recording medium in association with a disk shape.
[0019]
FIG. 2 is a schematic diagram for explaining a method of creating an SMF in the SMA-2 area.
[0020]
In FIG. 1, the logical format of the disc-shaped recording medium 10 conforms to UDF (Universal Disk Format). In the disk-shaped recording medium 10, a lead-in area 11 is arranged on the innermost circumference. A logical sector number (Logical Sector Number, hereinafter abbreviated as "LSN") is allocated from the outside of the lead-in area 11, and the volume information area 12, the SMA (space management area) -1 area 15, and the SMA-2 area are assigned in that order. 16, an SMA-3 area 17 and a volume information area 13 are arranged, and a lead-out area 14 is arranged at the outermost periphery. The SMA-1 area 15 to the SMA-3 area 17 are assigned a logical block number (hereinafter, abbreviated as “LBN”).
[0021]
VRS, MVDS, and LVIS are written in the volume information area 12 based on the UDF regulations. AVDP is placed in LSN 256 in volume information area 12. Further, the AVDP is also written in the sector of the last logical sector number and the sector of (last logical sector number-256). The contents of the MVDS are written twice in the volume information area 13 inside the lead-out area 14 as an RVDS (Reserve Volume Descriptor Sequence).
[0022]
A partition area is provided between the logical sector number 272 and (the last logical sector number -272). The SMA-1 area 15 to the SMA-3 area 17 are arranged in this partition area. The SMA-1 area 15 provided on the innermost peripheral side of the partition area includes an FSDS (File Set Descriptor Sequence) and an SBD (Space Bitmap Descriptor) based on the UDF regulations. TD (Terminating Descriptor). The SBD stores information indicating the entire free area of the disk-shaped recording medium 10 and expresses this by setting a flag for each sector. FSD is the root in the hierarchical structure of the file system. , The logical address and the size of the FE (File Entry) are shown.
[0023]
1 and 2, the SMA-2 area 16 includes a root Dir. FE, Root Dir. Is an area where the entity of the SMF (Space Management File) and the entity of the SMF are placed. As will be described later, by reducing the required amount of the entity of the SMF as necessary, the sub-Dir. FE, including the FID that points to the file. Is placed in the SMA-2 area 16. That is, the FID and the FE of the directory are collectively recorded in the SMA-2 area 16.
[0024]
The SMF is composed of two entities, indicated by AD-0 and AD-1, respectively, in the SMF FE. The first entity of the SMF is an area secured for describing information on the location (logical address) and size of the area initially secured as the second entity of the SMF. In FIG. 2, the area is indicated by AD-0. As will be described later, the second entity of the SMF is an area reserved for use for FID created during recording of data on the disk-shaped recording medium 10 after format processing and FE of a directory. In FIG. 2, the area is indicated by AD-1.
[0025]
As described above, the SMF is divided into two entities, and the information on the initial location and size of the second entity is described in the first entity, so that the location where the FE of the SMF is recorded and the root / Dir. SMA-2 area can be defined regardless of where the FE is recorded. Further, as described later, the sub-Dir. Deletion and root / Dir. It can respond flexibly to the deletion of the files below.
[0026]
In such an SMF, an unused area of the SMA-2 area 16 is secured with a predetermined capacity at the time of formatting as a file with a specific attribute. By handling the unused area as a file as an SMF, it is possible to prevent the unused area from being recognized as a free area in the above-described SBD.
[0027]
Here, the route Dir. FE, Root Dir. May be stored in any of the SMA-2 areas 16, but from the viewpoint of high-speed access to these, the sectors are continuously recorded as shown in FIG. It is desirable. It should be noted that one object of the present invention, in which the drive device quickly recognizes in which sector the information recorded on the disk-shaped recording medium 10 is stored, has been achieved by providing the SMF.
[0028]
As already described in the conventional example, the FE indicates the location and size of the entity of the file or directory. The AD in the FE records such information. The FID is the name of a file or directory and the ICB (Information Control) in the FID.
Block) indicates the location and size of the FE.
[0029]
The SMA-3 area 17 is an area where the FE of the file and the data of the file are placed. In the SMA-3 area 17, the FE of the file and the data of the file corresponding to the FE are preferably arranged consecutively in address. When a file is added, it is preferable that the FE of the file to be added be arranged continuously in address with respect to the existing file, and the data of the file be arranged continuously in address. In this way, by arranging the FE of the file and the data of the file consecutively in address, the file can be accessed at high speed.
[0030]
Next, an example of a method of formatting the disk-shaped recording medium 10 will be described. It is assumed that the lead-in area 11 and the lead-out area 14 have already existed before the formatting process, for example, by being created in advance during a press process in the manufacturing process of the disk-shaped recording medium 10. The formatting process proceeds from the inner peripheral side to the outer peripheral side of the disk-shaped recording medium 10.
[0031]
When the format processing is started, first, the AVDP is written, and the above-described VRS, MVDS, and LVIS are written from outside the lead-in area 11.
[0032]
Next, a partition is created. In the partition, first, the SMA-1 area 15 is created, the FSD is written, and the root Dir. Is determined. Then, an SBD is created. At this time, the SMF area is secured by setting the above-described SMF area as a used area in the SBD.
[0033]
After the SBD is created and the SMA-1 area 15 is created, the SMA-2 area 16 is created from outside the SMA-1 area 15.
[0034]
In the creation of the SMA-2 area 16, first, based on the FSD written in the SMA-1 area 15, the root / Dir. Sector and root that describe the FE of the Dir. Are continuously secured and the root, Dir. Is written.
[0035]
Root Dir. Entity is the parent Dir. FID and SMF FID. In the FID of the SMF, the location of the FE of the SMF is specified.
[0036]
At this time, the attribute of the SMF is specified in the FID. The specified attribute of the SMF is for preventing the SMF from being erased, rewritten, or moved by another device or an OS (Operating System). For example, “hidden file attribute” is specified as an attribute of SMF. The “hidden file attribute” is an attribute that makes it impossible to view a file for which this attribute is set by a normal method.
[0037]
Next, an SMF FE is created. At the time of format processing, the FE of the SMF includes AD-0 that specifies the address and size in the file of the first entity and AD-1 that specifies the address and size in the file of the second entity. It is composed. Therefore, the file exists only by designating the FE, and can be used as a dummy file. “Read-only file attribute” and “system file attribute” are specified in the FE of the SMF.
[0038]
The “read-only file attribute” is an attribute indicating that the file for which this attribute is set is read-only, and that alteration or deletion is prohibited by the system. The “system file attribute” is an attribute indicating that the file to which this attribute is set is a file necessary for the system. By designating these three attributes together in the SMF, it is possible to prevent processes such as erasing, rewriting, and moving the SMF from being performed except for intentional operations. Note that these attributes can be canceled by a known method.
[0039]
Next, the root Dir. A first entity of the SMF is created to be continuous to the sector describing the entity of the SMF, and the initial location and size of the second entity of the SMF are described in this. That is, the location and size of the SMF in the second entity secured during the format processing are described in the first entity of the SMF. The format of this description is described in the form of an AD following the UDF, and in this specification, this pseudo AD is represented by [AD]. In FIG. 2, it is [AD-SMA2]. Then, as will be described later, since the second entity of the SMF may be extended and there may be a plurality of [AD] s, in order to indicate this number, in the form of an AED (Allocation Extended Descriptor) following the UDF. Is described. This pseudo AED is expressed as [AED] in this specification.
[0040]
As described above, by making the SMF exist in the SMA-2 area 16, a free area of the SMA-2 area 16 can be secured by the SMF. After the format processing, the sub Dir. When the FE and the entity of the sub-Dir. Are written, the area in the second entity of the SMF is deleted. Are created in the SMA-2 area 16.
[0041]
Thus, the SMA-2 area 16 is created. The SMA-3 area 17 is outside the SMA-2 area 16, but no processing is performed on the SMA-3 area 17. That is, the SMA-3 area 17 is an unused area, in which file data and the like are recorded after the format processing. Then, the RVDS is created by skipping over the area designated as the SMA-3 area 17. As described above, the information of the previously created MVDS is written twice, as described above. The RVDS is created, and the format processing of the disc-shaped recording medium 10 is completed.
[0042]
Next, after the format processing, the sub-Dir. A method for adding a description will be described.
[0043]
FIG. 3 is a schematic diagram for explaining a method of adding a subdirectory after the format processing.
With respect to the state of FIG. (New Dir.) Will be described.
[0044]
First, the root Dir. Of the new Dir. Is added. At this time, the route Dir. If there is a vacancy in the sector in which the entity is stored, as shown in FIG. 3, the sector is added. On the other hand, although not shown in the figure, if there is no empty space in the sector, after reducing the size (size) of the area in the second entity of the SMF, a new Dir. Is added.
[0045]
Next, the new Dir. , The size of the area in the second entity of the SMF is reduced. The new Dir. Is added.
[0046]
Next, the new Dir. (The FID of the parent Dir. In FIG. 3) is further reduced in size in the second entity of the SMF. The new Dir. Entity is added.
[0047]
Next, the information of AD-1 in the SMF FE is updated to reflect the change in size of the second SMF in the second entity.
[0048]
As a result of such an operation, the SMA-2 area 16 becomes as shown in FIG. Is added, and the added sub Dir. Information is collectively recorded in the SMA-2 area 16 together with the information on the already recorded directory.
[0049]
Next, the root Dir. The process of adding a file to the file will be described.
[0050]
FIG. 4 is a schematic diagram (part 1) illustrating a process of adding a file to the root directory after the format process.
[0051]
FIG. 5 is a schematic diagram (part 2) for explaining the process of adding a file to the root directory after the format process.
[0052]
For the state of FIG. A case where a file (new Dir.) Is added to the file will be described.
[0053]
First, the root Dir. Is added to the entity of. At this time, the route Dir. If there is a vacancy in the sector where the entity is stored, as shown in FIG. 4, an addition is made to the sector.
[0054]
On the other hand, if there is no free space in the sector, as shown in FIG. 5, after reducing the size of the area in the second entity of the SMF, the FID of the new file is added to the vacant area due to the reduction. Is done. In this case, since the size of the second entity of the SMF has been changed, the information of AD-1 in the SMF FE is updated.
[0055]
Next, the FE of the new file is added to the area of the SMF-3 area 17. Next, the entity of the new file (data of the parent file in FIGS. 4 and 5) is added to the area of the SMF-3 area 17. Thus, the FE and entity of the file are located in the SMA-3 area 17.
[0056]
As a result of such an operation, the SMA-2 area 16 becomes as shown in FIG. 4 or FIG. 5, and the new file is the root / Dir. The lower part is added, and information on the added new file is collectively recorded in the SMA-2 area 16 together with information on the already recorded directory.
[0057]
Here, in the case of recording a plurality of files, from the viewpoint of enabling continuous access and high-speed access, the entity of the file is arranged immediately after the FE of the file, and a continuous It is preferable to place each file in the file.
[0058]
For example, the root Dir. The FE of the file to be added (referred to as file A) is created at the address indicated by the FID added in the entity of. The entity of the file A is continuously written in address to the FE of the file A. Further, when writing the file B, the file C,..., The FE of the file B is successively created at the rear end of the entity of the file A written immediately before, and the address of the FE is The substance of file B is written continuously. Similarly, for the next file C, similarly, the FE of the file C is continuously created from the rear end of the immediately preceding file B in an address manner, and the entity of the file C is continuously addressed in an address to the FE of the file C. Written.
[0059]
By the way, for example, the root Dir. Many sub-Dir. When a new file is added, the root, Dir. Of the entity of the sub Dir. FE, Sub Dir. Many FIDs of the new file in the entity of are added. As a result, the SMA-2 area 16 may be full due to the added FE or FID. FIG. 6 shows such a state.
[0060]
FIG. 6 is a schematic diagram illustrating a state in which the second entity of the SMF is used up.
[0061]
In FIG. 6, since the second entity of the SMF has been used up, AD-1 indicating the second entity of the SMF has disappeared in the FE of the SMF. Here, since the information about the second entity of the SMF is described in the first entity of the SMF, the drive device can recognize the location and the size of the SMA-2 area 16, and The mutual positional relationship between directories and files recorded on the recording medium 10 can be recognized at high speed.
[0062]
In such a case, if there is a free space in the capacity of the SMA-3 area 17, the SMA-3 area 17 is further divided into a plurality of SMA areas by using the free space, so that the SMA-2 area 16 is divided. An SMA-4 area which is an extended area and an SMA-5 area corresponding to an SMA-3 area for recording data are newly created outside the position where the file exists in the SMA-3 area 17. This is shown in FIG.
[0063]
FIG. 7 is a schematic diagram for explaining a process of expanding the second entity of the SMF.
[0064]
In FIG. 7, by securing the SMA-4 area, information on the initial location and size of the SMA-4 area is added to the entity pointed to by AD-0 of the SMF as [AD-SMA4] in AD format. [AED] is updated with the addition of this table. The location and size of the newly secured SMA-4 area are added to the FE of the SMF as AD-2.
[0065]
Then, the root Dir. The sub Dir. When a file or a file is added, an operation similar to the operation described above with reference to FIGS. 3 to 5 is performed on the second entity of the SMF indicated by AD-2.
[0066]
Next, the sub-Dir. Will be described.
[0067]
FIG. 8 is a schematic diagram (part 1) for explaining a method of deleting a sub directory added after the format processing.
[0068]
FIG. 9 is a schematic diagram (part 2) for explaining a method of deleting a sub directory added after the format processing.
[0069]
FIG. 8 shows the sub-Dir. FIG. 9 shows a state of the SMA-2 area 16 before deletion of the sub-Dir. Shows the state of the SMA-2 area 16 after deleting the.
[0070]
In FIG. 8, as described with reference to FIG. 3, the SMA-2 area 16 stores the sub-Dir. Root. Dir. Of the added sub-Dir. FID is new Dir. 1 FID, New Dir. 2 FID, New Dir. 3 are added to the area where the second entity of the SMF is reduced and vacated, and each of the added sub-Dir. FE and entity are new Dir. 1 FE and entity, new Dir. 2 FE and entity, new Dir. 3 FE and entity, etc. are added.
[0071]
In such a state, the sub-Dir. Will be described.
[0072]
First, the drive device refers to the first entity of the SMF indicated by AD-0 of the FE of the SMF, and recognizes the initial range of the second entity of the SMF from the location and size indicated by [AD].
[0073]
Next, the drive device determines the sub-Dir. FID, FE, and entity are deleted. The entity describing the FID to be deleted is updated to reflect this deletion.
[0074]
Next, the drive device deletes the deleted sub-Dir. It is determined whether or not the FE and the entity are within the initial range.
[0075]
Next, if the drive device is within the initial range, the deleted sub-Dir. Since the FE and the actual area are unused areas, an AD indicating this is added to the FE of the SMF.
[0076]
For example, in the state shown in FIG. Is the new Dir. 2, if the root / Dir. Of the new Dir. 2 is deleted and updated, and the new Dir. The FE of No. 2 and the AD indicating the sector in which the entity is stored are added to the FE of the SMF as AD-12.
[0077]
Since the initial location and size information of the second entity of the SMF is described in the first entity of the SMF, the sub-Dir. Is within the initial range in the second instance of the SMF. If it is within the range, the deleted sub-Dir. By adding the sector in which the FE and the entity are stored to the FE of the SMF, the sector can be handled again as the second entity of the SMF. For this reason, although the sector is treated as an SMF, it is recognized as a part of a file, but a new sub-Dir. Is added, the sector can be assigned, and information about the directory can be collected.
[0078]
Here, in the above description, the sub-Dir. Has been described, but when a file is deleted or an empty sector is generated by deleting an FID, whether or not the empty sector exists within the initial range in the second entity of the SMF is determined. It is determined and processed similarly.
[0079]
Next, a drive device applicable to the present invention will be described.
[0080]
FIG. 10 is a diagram illustrating a configuration of an example of a drive device.
[0081]
Here, the above-mentioned disc-shaped recording medium 10 is a recording medium using a phase-change metal material for the recording layer, and the drive device 50 controls the temperature applied to the recording layer by adjusting the output of the laser to adjust the crystal / crystal. Data is recorded on the disk-shaped recording medium 10 by a phase change technique that changes the state to an amorphous state.
[0082]
In FIG. 10, a drive device 50 includes a spindle motor 51, an optical pickup 52, a laser driver 53, a recording equalizer 54, a buffer memory 55, and an encoder / decoder circuit 56 (hereinafter, abbreviated as "ENC / DEC circuit"). 56, a thread mechanism 57, an RF signal processing circuit 58, an address extraction 59, a drive control microcomputer 60, an interface (hereinafter abbreviated as "I / F") 61, a servo circuit 62, and a memory 63.
[0083]
The spindle motor 51 drives the chucked disk-shaped recording medium 10 to rotate, and the rotation speed is servo-controlled by a servo circuit 62.
[0084]
Recording and reproduction of data on the disk-shaped recording medium 10 are performed by the optical pickup 52. The optical pickup 52 is thread-transferred by the thread mechanism 57 in the radial direction of the disk-shaped recording medium 10.
[0085]
Data from the external digital device 71 is supplied to the drive device 50 via an I / F 61, for example, a SCSI (Small Computer System Interface). Here, the digital device 71 may be any digital device as long as it is capable of inputting and outputting digital signals and having an appropriate interface, such as a personal computer or a portable digital video recorder with a camera. It may be built into the device.
[0086]
The I / F 61 is connected to an ENC / DEC circuit 56 and a drive control microcomputer. The ENC / DEC circuit 56 includes a buffer memory 55, a recording equalizer 54, an RF signal processing circuit 58, a servo circuit 62, and a drive control microcomputer. 60 are connected.
[0087]
The memory 55 is a buffer memory that holds write data or read data. The write data is supplied from the digital device 71 to the ENC / DEC circuit 56 via the I / F 61. The ENC / DEC circuit 56 generates data in the above-described format at the time of recording, and then encodes the data according to the format. Then, the ENC / DEC circuit 56 performs a decoding process at the time of reproduction, and outputs digital data to the digital device 71 via the I / F 61.
[0088]
The address is added, for example, as a subcode in the ENC / DEC circuit 56, and is also added to a header in the data.
[0089]
Data from the ENC / DEC 56 is supplied to the laser driver 53 via the recording equalizer 54. The laser driver 53 generates a drive waveform having a predetermined level necessary for recording data on the disk-shaped recording medium 10. An output of the laser driver 53 is supplied to a laser in the optical pickup 52, and a laser beam having an intensity corresponding to the output is applied to the disk-shaped recording medium 10 to record data. In addition, the laser driver 53 appropriately controls the intensity of the laser beam by the APC (Automatic Power Control) in the RF signal processing circuit 58 as described above.
[0090]
On the other hand, a signal generated by the optical pickup 52 due to return light from the disk-shaped recording medium 10 is supplied to an RF signal processing circuit 58. The address extraction circuit 59 extracts address information based on the signal supplied from the RF signal processing circuit 58. The extracted address information is supplied to the drive control microcomputer 60.
[0091]
Further, the RF signal processing circuit 58 generates a tracking error signal TE and a focus error signal FE by a matrix amplifier calculating a detection signal of a photodetector in the optical pickup 52. The tracking error signal TE and the focus error signal FE are supplied to the servo circuit 62.
[0092]
The drive control microcomputer 60 controls the seek operation using the address, and controls the laser power using the control signal. The drive control microcomputer 60 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like, and includes an I / F 61, an ENC / DEC circuit 56, an RF signal processing circuit 58, a servo circuit 62, and the like. Control the entire drive. Therefore, the drive control microcomputer 60 controls the sub Dir. The various processes described above are performed when adding / deleting a file and adding / deleting a file. Further, the memory 63 can be connected to the drive control microcomputer 60.
[0093]
Further, an RF signal obtained by reproducing the disc-shaped recording medium 10 is supplied to an ENC / DEC circuit 56, which demodulates a modulation process performed at the time of recording and decodes an error correction code (that is, decodes an error correction code). , Error correction) and the like. The ENC / DEC circuit 56 stores the reproduced data in the buffer memory 55 and, upon receiving a read command from the digital device 71, transfers the read data to the digital device via the I / F 61.
[0094]
The frame synchronization signal, the tracking error signal TE and the focus error signal FE from the RF signal processing circuit 58, and the address information from the address extraction circuit 59 are supplied to the servo circuit 62. The servo circuit 62 performs tracking servo and focus servo for the optical pickup 52, spindle servo for the spindle motor 51, and thread servo for the thread mechanism 57.
[0095]
In the above description, the format data for the disk-shaped recording medium 10 is generated by the ENC / DEC circuit 56, but this is not limited to this example. The format data can be generated by the drive control microcomputer 60. The format data may be supplied from the digital device 71.
[0096]
【The invention's effect】
As described above, the present invention relates to Dir. The names, addresses, lengths, and the like of files and files are collectively recorded in a predetermined area (SMA-2 area) on the disk-shaped recording medium. Therefore, there is an effect that such management information can be read at high speed.
[0097]
In the present invention, the sub-Dir. And root Dir. Since the information of the initial range in the area (the second entity of SMF) for storing the information about the file below is recorded on the disc-shaped recording medium, regardless of the location of the FE of the root / Dir or the FE of the SMF, The SMA-2 region can be defined.
[0098]
In the present invention, the free area of the SMA-2 area is managed as a file. Further, after the format processing, the sub-Dir. After adding files and sub-Dir. Also, a free space generated by deleting a file is managed again as a part of the file. Therefore, there is an effect that writing from the other OS, for example, to the SMA-2 area can be restricted.
[0099]
Further, according to the present invention, when the SMA-2 area secured at the time of the format processing becomes full, the information of the file managed as the free area of the SMA-2 area can be rewritten by simply rewriting the information of the file. There is an effect that two regions can be extended.
[0100]
Further, according to the present invention, since a special attribute is set for a file managed as a free area in the SMA-2 area, the file managed as a free area is deleted from another OS or the like. This has the effect of being prevented beforehand.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a logical format of a disk-shaped recording medium in association with a disk shape.
FIG. 2 is a schematic diagram for explaining a method of creating an SMF in an SMA-2 area.
FIG. 3 is a schematic diagram for explaining a method of adding a subdirectory after a format process.
FIG. 4 is a schematic diagram (part 1) for explaining a process of adding a file to a root directory after a format process;
FIG. 5 is a schematic diagram (part 2) for explaining a process of adding a file to a root directory after a format process;
FIG. 6 is a schematic diagram illustrating a state in which a second entity of the SMF is used up.
FIG. 7 is a schematic diagram illustrating a process of expanding a second entity of the SMF.
FIG. 8 is a schematic diagram (part 1) for explaining a method of deleting a sub directory added after a format process;
FIG. 9 is a schematic diagram (part 2) for explaining a method of deleting a sub directory added after a format process.
FIG. 10 is a block diagram illustrating a configuration of an example of a drive device.
[Explanation of symbols]
10 Disc-shaped recording medium
15 Space Management Area-1
16 Space Management Area-2
17 Space Management Area-3
21 Root directory file entry
22 Root directory entity
23 Space Management File File Entry

Claims (7)

In a recording method for recording data on a disc-shaped recording medium based on a hierarchical file system,
Management information for managing the hierarchical structure of the file system is recorded in a specific area of the disk-shaped recording medium,
To treat the unused area in the specific area as a special file,
A recording method, wherein information on an initial location and size in the special file and information on a current location and size in the special file are recorded in the specific area. When adding the management information to the specific area, reduce the size of the special file according to the added management information,
The recording method according to claim 1, wherein the management information to be added is recorded in a portion vacated in the specific area by being reduced in size. When there is no more area for adding the management information in the specific area, a new special file is set as an unused area of the disk-shaped recording medium, and the initial location and size of the new special file are set. 2. The special file area is enlarged by recording information on the current location and size in the new special file in the specific area. The recording method described. When deleting the added management information, if the management information to be deleted is in the initial area of the special file, the information relating to the location and size of the part vacated by the deletion is stored in the specific area. 2. The recording method according to claim 1, wherein the information is recorded in the medium. 2. The recording method according to claim 1, wherein a hidden file attribute, a system file attribute, and a read-only file attribute are set for the special file. In a recording device that records data on a disk-shaped recording medium based on a hierarchical file system,
Means for recording management information for managing the hierarchical structure of the file system in a specific area of the disk-shaped recording medium;
Means for treating an unused area in the specific area as a special file;
Recording means for recording information on an initial location and size in the special file and information on a current location and size in the special file in the specific area. In a recording medium that records data on a disc-shaped recording medium based on a hierarchical file system,
Management information for managing the hierarchical structure of the file system is recorded in a specific area of the disc-shaped recording medium,
Unused area in the specific area is treated as a special file,
A recording medium, wherein information on an initial location and size in the special file and information on a current location and size in the special file are recorded in the specific area.

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