JP2008090955A - Media writing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To access a written file even if writing is interrupted in the midway when data is written in a recording medium by a session unit. <P>SOLUTION: This device is provided with a writing means for writing data in a medium by a session unit, a means for storing information to specify data written in the medium by the writing means, and a means for generating, when the writing means stops the writing in the middle of writing one session according to a predetermined stop instruction, and closes the session, management information regarding the written data by referring to the storage means. The writing means writes the management information as a session different from the closed session. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a technique for writing data to a recording medium.

  Conventionally, as a method of writing data to a recording medium such as a CD (Compact Disk) or a DVD (Digital Versatile Disk), a method that is performed in units of sessions is known. In this method, a new session can be additionally written even after the writing is once completed, and additional writing is possible.

  Normally, in such a writing method in units of sessions, if the writing of a session is interrupted halfway, the file body in the written data cannot be accessed. This is because the management information of the file body written together with the file body as part of the data becomes inaccurate. Further, since the session is not normally closed when it is interrupted, additional writing is impossible.

  Patent Document 1 is a technique for recovering a recording medium in which session writing is interrupted in the middle. In Patent Document 1, first, a session interrupted on the way is normally closed. Thereafter, the recording medium is restored by writing again the data to be written into the newly opened session.

JP 2003-85876 A

  However, the above-described method ignores data written in the interrupted session and rewrites data to be written from the beginning. Therefore, it is necessary to have enough free space to write data to be written from the beginning. Depending on the area occupied by the interrupted session, there may be insufficient free space and recovery may not be possible. In addition, since data written in the interrupted session is ignored, the file body for which writing has been completed is wasted.

  Accordingly, an object of the present invention is to enable access to a written file body even when writing is interrupted in the middle of writing data to a recording medium in units of sessions.

  A media writing apparatus according to one aspect of the present invention includes a writing unit that writes data to a medium in session units, a unit that stores information for specifying data written by the writing unit to the medium, Means for generating management information relating to written data with reference to the storage means when the writing means interrupts the writing according to a predetermined interruption instruction during writing of one session and closes the session; The writing means writes the management information into the medium as a session different from the closed session.

  In a preferred embodiment, the management information may be a directory record indicating a position of a file body in which writing has been completed in writing of the one session, and a path table indicating a position of the directory record.

  In a preferred embodiment, the information for specifying the data written on the medium includes whether or not writing has been completed for all the file bodies included in the data to be written, and all the information included in the data to be written. Write success / failure information indicating whether or not the writing of the directory record of the directory is completed, and file information indicating the writing position on the medium of the file body in which the writing has been completed may be included.

  In a preferred embodiment, the information for specifying the data written on the medium is information indicating the writing position on the medium of the directory record of each directory for all directories included in the data to be written. And the total number of writes indicating the number of directory records and file bodies of the child directories in which writing has been completed among the child directories and file bodies under the respective directories.

  According to the present invention, when data is written to a recording medium in session units, the written file body can be accessed even when the writing is interrupted.

  Hereinafter, a media writing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a functional configuration diagram of a media writing device 101 according to the present embodiment.

  The media writing device 101 writes data to be written (hereinafter, “data to be written”) to a recording medium. The data to be written may be data held inside the media writing device 101 or data recorded on a recording medium such as a memory card. Moreover, the recording media into which the write target data is written are, for example, CD, DVD and the like. In the present embodiment, a case where data recorded on the memory card 107 is written to the CD 108 will be described as an example.

  The media writing apparatus 101 is configured by, for example, a general-purpose computer system, and individual functions in the media writing apparatus 101 described below are realized by executing a computer program, for example. Further, the media writing device 101 can be realized as a single device, or can be incorporated into another device such as a printer, a digital multi-function peripheral, a viewer, and can be realized as a part of the function of the device. It can also be realized in combination with an electronic still camera or digital video camera by using a part of functions such as a still camera or a digital video camera.

  The media writing device 101 includes a controller 102, a memory 103, a user I / F 104, a memory card reader / writer 105, and a CD reader / writer 106.

  The memory card reader / writer 105 reads data stored in the memory card 107 and writes data to the memory card 107.

  The CD reader / writer 106 reads data stored on the CD 108 and writes data on the CD 108.

  The memory 103 stores written information that will be described later. The written information is created by the write control unit 1022 and stored in the memory 103. The written information stored in the memory 103 is referred to by the interruption control unit 1023.

  The user I / F 104 receives a write interruption from the user. The user I / F 104 that has received a write interruption request from the user notifies the controller 102 to that effect.

  The controller 102 controls each process performed by the media writing device 101. The controller 102 includes a write control unit 1021, a written information creation unit 1022, and an interruption control unit 1023.

  The write control unit 1021 performs a write process for writing the write target data to the CD 108. For example, first, the write control unit 1021 reads write target data from the memory card 107 via the memory card reader / writer 105. From the read write target data, the write control unit 1021 generates management information for the file body as described later. The writing control unit 1021 executes the writing process by writing the management information and the file body extracted from the writing target data to the CD 108 via the CD reader / writer 106.

  Here, the structure of data before writing (data to be written) and data after writing (data written to the CD 108) will be described with reference to FIGS.

  FIG. 2 is a diagram showing an example of the structure of the write target data 201 recorded on the memory card 107.

  The write target data 201 has, for example, a hierarchical structure as shown in the directory structure 202, and consists of a set of directories and file bodies. In the case of FIG. 2, as can be seen from the directory structure 202, there are two directories “ABC” and “DEF” under the root directory. Under “ABC”, there is one image file “ABC001.JPG”, and under “DEF”, there are three image files “DEF001.JPG”, “DEF002.JPG”, and “DEF003.JPG”. ”. The media writing device 101 can write all of these directories and file bodies to the CD 108, or can specify a part of the directories and file bodies and write only the specified portion to the CD 108. In the present embodiment, a case will be described in which all of these directories and file bodies are written to the CD.

  A FAT entry 203 shows such a hierarchical structure as a logical data structure. The media writing device 101 can read the write target data 201 by referring to the FAT entry 203.

  Reference numeral 204 shown in the FAT entry 203 is information about a directory (hereinafter, “directory information”). The directory information 204 includes a directory under the directory or a directory entry 205 of the file body. The directory entry 205 includes information such as the directory name or file name, the file size, the update date, the position of the directory information 204, or the position of the file body for the directory or file body. Therefore, the media writing device 101 can identify the hierarchical structure of the directory and the position of the file body by referring to the directory entry 205.

  The FAT entry 203 will be described in detail. As the directory information 204, directory information 204a for the root directory, directory information 204b for "ABC", and directory information 204c for "DEF" are stored. Further, the directory information 204a of the root directory includes a directory entry 205a of “ABC” and a directory entry 205b of “DEF”. Similarly, the directory information 204b of “ABC” includes the directory entry 205c of “ABC001.JPG”, and the directory information 204c of “DEF” includes the directory entry 205d of “DEF001.JPG” and “DEF002.JPG”. Directory entry 205e and directory entry 205f of “DEF003.JPG” are included.

  As described above, each directory entry 205 includes the location of the directory information 204 or the location of the file body for that directory or file body. That is, for example, the directory entry 205a of “ABC” has the location of the directory information 204b of “ABC”, and the directory entry 205c of “ABC001.JPG” has the location of the file body of “ABC001.JPG”, respectively. include. Therefore, the media writing device 101 refers to the directory entry “ABC” in the directory information 204a of the root directory, identifies the position of the directory information 204b of “ABC”, and “ABC001” in the directory information 204b of “ABC”. The location of “ABC001.JPG” can be specified by referring to the directory entry “.JPG”.

  FIG. 3 is a diagram showing an example of the structure of data 301 written to the CD 108.

  The media writing device 101 writes data in session units. That is, data is written in a section surrounded by a lead-in 302 indicating the start of a session and a lead-out indicating the end of the session.

  Data to be written on the CD 108 includes a PVD (Primary Volume Descriptor) 303, a path table 304, a directory record 305, and a file body 306. The path table 304 and the directory record 305 are management information 307 for the file main body 306, and are information for representing the hierarchical structure of the directory and specifying the position of the file main body 306. The management information 307 is normally generated by referring to the FAT entry 203 of the write target data 201 and acquiring necessary information from the directory information 204 and the directory entry 205.

  The position where these data are written is specified based on the sector number assigned to the CD 108. Although sector numbers are shown in the figure, these are not accurate numerical values, but are simply given for explanation.

  The PVD 303 stores basic description information about the volume, for example, the volume name, the author name, the location of the path table 304, the directory record 305a of the root directory, and the like. FIG. 4 specifically shows information elements of the PVD 303. As can be seen from the figure, the PVD 303 stores the position of the path table 304 (sector number 2) and the position of the directory record 305a of the root directory (sector number 3).

  The path table 304 stores information on all directories in the volume, for example, the directory name, the directory name of the parent of the directory, the position of the directory record 305 of the directory, and the like. FIG. 5 shows the specific contents of the path table 304. For example, focusing on “ABC”, it can be seen that the parent directory is the root directory, and the position of the directory record 305b of “ABC” is sector number 4. That is, by referring to the path table 304, the position of the directory record 305b of “ABC” can be directly specified. As will be described later, each directory record 305 describes the position of the directory record 305 or the file body 306 of the directory under the directory, and it is also possible to trace each subdirectory one by one from the root directory. The target directory or file body 306 can be searched. In the case of “ABC”, the position (sector number 4) of the directory record 305b of “ABC” is specified by referring to the directory record 305a of the root directory. In this exhaustive search method, when searching for a directory or file body 306 at a shallow position, such as “ABC”, this is not a problem. It takes a lot of time. Therefore, the path table 304 is used to search the directory at high speed.

  The directory record 305 includes information on all directories or file bodies 306 under the directory (hereinafter, “detailed information”), for example, the directory name or file name, file size, update date for the directory or file body 306. The location of the directory record 305 or the location of the file body 306 is stored. This directory record 305 is generated for all directories and written to the CD 108. Therefore, in this embodiment, as shown in FIG. 3, a directory record of the root directory (hereinafter, “root directory record”. The same applies to other directories) 305a, an ABC directory record 305b, and a DEF directory record. 305c is generated and written to the CD 108.

  FIG. 6 shows the specific contents of each directory record 305. As can be seen from FIG. 5A, the root directory record 305a includes detailed information 601 regarding “ABC” and “DEF”. As a result, it is understood that “ABC” and “DEF” exist under the root directory. The detailed information 601 stores a start sector number. This start sector number indicates the position of the directory record 305 when the detailed information 601 relates to the directory, and indicates the position of the file main body 306 when the detailed information 601 relates to the file main body 306. Yes. Therefore, the start sector number 6 stored in the detailed information 601a regarding “DEF” indicates the position of the DEF directory record 305c. Similarly, since the ABC directory record 305b ((b) in the figure) includes detailed information 601b regarding “ABC001.JPG”, it can be seen that “ABC001.JPG” is present under “ABC”. . Further, the start sector number 5 stored in the detailed information 601b regarding “ABC001.JPG” is the file body of “ABC001.JPG” (hereinafter, “ABC001.JPG file body”. The same applies to other files) 306a. It will show the position.

  The file body 306 is the file body itself included in the write target data 201. Therefore, the file body extracted by referring to the directory information 204 and the directory entry 205 of the FAT entry 203 is written as it is.

  As can be understood from the above description, in the data 301 after writing, the position of the file body 306 is specified by using the management information 307. For example, DEF001. The position of the JPG file body 306b is specified as follows. That is, first, referring to the PVD 303, the position (sector number 3) of the root directory record 305a is acquired. Next, the location (sector number 6) of the DEF directory record is acquired with reference to the root directory record 305a. Then, referring to the DEF directory record 305c, DEF001. The position (sector number 7) of the JPG file body 306b is specified. There are also the following methods. That is, referring to the PVD 303, the position (sector number 2) of the path table 304 is acquired. Referring to the path table 304, the position (sector number 6) of the DEF directory record 305c is acquired, and the DEF001. The position (sector number 7) of the JPG file body 306b is specified.

  If the writing is interrupted in the middle, the management information 307 includes information on the directory record 305 and the file main body 306 that have not been written, and becomes inaccurate. Therefore, even if the session is closed thereafter, the management information 307 cannot be used, and the file main body 306 cannot be accessed.

  The media writing apparatus 101 according to the present embodiment enables access to the written file body 306 even when writing is interrupted in the middle. That is, the media writing device 101 regenerates the management information 307 so that the file main body 306 that has been written before the interruption can be referred to. The media writing device 101 writes the regenerated management information (hereinafter referred to as “appropriate management information”) to a new session so that the written file body 306 can be accessed.

  Returning to FIG. 1, a method for generating appropriate management information will be described below.

  The written information creation unit 1022 creates information necessary for generating appropriate management information (hereinafter “written information”). The written information is information for specifying the file body 306 that has been written to the CD 108. For example, information indicating the directory record 305 and the file body 306 for which writing has been completed before being interrupted, and position information of the file body 306 are included. The information indicating the directory record 305 and the file body 306 for which writing has been completed before the interruption may be, for example, a list of directory names or file names for which writing has been completed, May be information indicating whether or not writing has been performed for all directories and the file main body 306. Further, the position information of the file body 306 that has been written may be any information that can identify the start sector number of the file body 306.

  FIG. 7 is a diagram showing an example of the written information 701. As shown in FIG. 3, DEF002. The written information 701 is shown when writing is interrupted during the writing of the JPG file body. In the figure, written information 701 is individually created for all directories included in the write target data 201. The root directory written information 701a ((a) in the figure) is written information relating to the root directory. Similarly, ABC written information 701b ((b) in the figure) and DEF written information 701c ((c) in the figure) are written information relating to “ABC” and written information relating to “DEF”, respectively. Each written information 701 stores information indicating whether or not writing has been completed for the directory record 305 of the directory (hereinafter, “write success / failure information”) 702. In the drawing, the write success / failure information 702 is “written” for all directories. As a result, it can be seen that the writing is completed for the directory records 305 of all the directories. Each written information 701 includes information indicating whether or not writing has been completed for the file main body 306 under the directory and information including a start sector number indicating the position of the file main body 306 (hereinafter, “ File information ") 703 is stored. For example, when viewing the file information 703c of the DEF written information 701c, “DEF001.JPG” stores the start sector number. As a result, DEF001. It can be seen that the writing of the JPG file body has been completed, and its starting sector number is 7. On the other hand, for “DEF002.JPG” and “DEF003.JPG”, the start sector number is not stored. As a result, it is also understood that writing has not been completed for these file bodies 306.

  Further, written information as indicated by reference numeral 701 ′ is also conceivable. In the written information 701 ′, among the directory record 305 and the file body 306 of the directory under the directory, the total number of directory records 305 and file bodies 306 that have been written (hereinafter, “total number of writes”) 704, The start sector number (hereinafter referred to as “start start sector number”) 705 of the directory record of the directory is stored. Normally, when the write target data 201 is written to the CD 108, the structure of the data 301 to be written is determined based on the configuration of the FAT entry 203. That is, by referring to the FAT entry 203, it is possible to know in what arrangement the directory record 305 and the file body 306 are written. Therefore, if the total number of writes 704 and the head start sector number 705 are known, the FAT entry 203 is referred to, information indicating the directory record 305 and the file body 306 that have been written before the interruption, and the position information of the file body 306. You can know. Specifically, for example, the storage order of the plurality of detailed information 601 included in the directory record 305 is determined according to the storage order of the directory entry 205 included in the directory information 204. Therefore, it can be seen which directory record 305 or file body 306 has been written by looking at the total number of writes 704 for the directory. Further, the size of the directory record 305 is fixed, and the size of the file body 306 can be known by referring to the corresponding directory entry 205. As described above, the arrangement of the directory record 305 and the file main body 306 is also known from the FAT entry 203, so that the position of the file main body 306 can be specified from the head start sector number 705. In this way, by configuring the written information 701 ′ by the total number of writes 704 and the head start sector number 705, the required information amount can be reduced compared to the written information 701, and the amount of use of the memory 103 Can be reduced.

  Returning again to FIG. The written information creation unit 1022 creates the above-described written information 701 and stores it in the memory 103. The written information 701 is updated every time the directory record 305 or the file body 306 is written, so that the written information creation unit 1022 updates the written information stored in the memory 103 each time. To do.

  When the writing process is interrupted halfway, the interruption control unit 1023 generates appropriate management information and writes it in a new session. The interruption of the write process occurs, for example, due to a write interruption request or a write error received via the user I / F 104.

  As described above, the appropriate management information is management information (path table 304 and directory record 305) that enables reference to the file body 306 that has been written before the interruption. Proper management information is generated with reference to written information 701 stored in the memory. Hereinafter, as shown in FIG. A method for generating proper management information and its structure will be described with reference to FIGS. 8 to 11, taking as an example a case where writing is interrupted in the middle of writing the JPG file body.

  FIG. 8 shows an example of the structure of data 801 that is newly written after the interruption.

  As described above, the appropriate management information 808 is written in a new session (here, the second session). Therefore, first, the lead-out 802 is written at the end of the first session, and the first session is closed. In addition, the second session is opened and data is written in a section surrounded by lead-in 803 and lead-out 807. Newly written data is PVD 804 and appropriate management information 808 (path table 805 and directory record 806).

  The contents of PVD 804 are shown in FIG. The PVD 804 includes the position information of the path table and the root directory record, and here, the position information of the path table 805 and the root directory record 806a newly written in the second session is stored. That is, the start sector number 12 of the path table 805 and the start sector number 13 of the root directory record 806a are stored.

  The contents of the path table 805 are shown in FIG. The contents of the path table 805 change depending on the directory record 305 for which writing has been completed before being interrupted. For example, when the DEF directory record 305c is not written, the regenerated path table 805 does not have an item “DEF”. Accordingly, the written information 701 is referred to in order to specify a directory to be included in the path table 805. Looking at the write success / failure information 702 of the written information 701 regarding each directory, it can be seen that writing has been completed for the directory records 305 of all the directories (root directory, “ABC”, “DEF”). Therefore, the path table 805 includes all directories.

  The path table 805 stores the positions of the directory records 305 related to all the directories. Here, the positions of the directory records 806 newly written in the second session are stored. That is, the start sector number 13 of the root directory record 806a, the start sector number 14 of the ABC directory record 806b, and the start sector number 15 of the DEF directory record 806c are stored.

  The contents of the directory record 806 are shown in FIG. The contents of the directory record 806 vary depending on the directory record 305 and the file body 306 that have been written before being interrupted. For example, when the DEF directory record 305c is not written, the regenerated root directory record 806a has no detailed information 1101a regarding “DEF”. Also, the DEF directory record 806c is not generated. Accordingly, the written information 701 is referred to in order to specify the directory record 806 itself to be generated and the detailed information 1101 to be included in the directory record 806. First, when the write success / failure information 702 of the written information 701 related to each directory is seen, it can be seen that writing has been completed for the directory records 305 of all directories (root directory, “ABC”, “DEF”). A directory record 806 is generated for the directory.

  Further, the detailed information 1101 to be included in each directory record 806 is specified as follows. That is, in the case of the detailed information 1101 related to the directory, the directory record 806 of the directory is generated, and in the case of the detailed information 1101 related to the file main body 306, it is specified depending on whether the writing to the file main body 306 is completed. The As described above, in the case of using the written information 701, directory records are generated for all directories. Accordingly, the detailed information 1101 of “ABC” and “DEF” is included in the root directory record 806a ((a) in the figure). Further, when viewing the file information 703b of the ABC written information 701b, ABC001. It can be seen that writing has been completed for the JPG file body 306a. Therefore, the ABC directory record 806b ((b) in the figure) includes ABC001. Detailed information 1101 of the JPG file main body 306a is included. Further, when viewing the file information 703c of the DEF written information 701c, DEF001. Writing has been completed for the JPG file main body 306b, but DEF002. JPG file main body 306c and DEF003. As for the JPG file body, it can be seen that the writing has not been completed. Therefore, the DEF directory record 806c ((c) in the figure) contains DEF001. The detailed information 1101 of the JPG file main body 306b is included (the detailed information 1101 of the DEF002.JPG file main body 306c and the DEF003.JPG file main body is not included).

  Next, the contents stored in each detailed information 1101. In particular, the start sector number is determined as follows. That is, in the case of the detailed information 1101 regarding the directory, the position where the directory record 806 of the directory is newly written is set as the start sector number. Therefore, for example, the position (sector number 15) where the DEF directory record 806c is written is stored in the start sector number of the detailed information 1101a regarding “DEF”. Further, in the case of the detailed information 1101 regarding the file body 306, the position when the file body 306 was written before the interruption is set as the start sector number. Therefore, in this case, the file information 703 of the written information 701 is referred to. For example, the start sector number of the detailed information 1101b regarding “ABC001.JPG” includes ABC001. The position when the JPG file main body 306a is written before the interruption, that is, the sector number 5 in the first session is stored. This ABC001. The position of the JPG file main body 306a is obtained by referring to the file information 703b of the ABC written information 701b. The contents other than the start sector number are the same as the management information 307 that can no longer be used. This can be obtained by referring to the FAT entry 203 of the write target data 201 again.

  Hereinafter, with reference to FIG. 12 and FIG. 13, the flow of the operation when the writing process is interrupted will be described.

  FIG. 12 is a flowchart showing processing when writing according to the present embodiment is interrupted.

  When the write control unit 1021 is performing writing, for example, the user I / F receives a write interruption request, and the writing process is interrupted (S1201).

  When the writing process is interrupted, the interrupt control unit 1022 closes the session in which the writing is interrupted (S1202). Further, the interruption control unit 1022 opens a new session in order to write appropriate management information 808 (S1203).

  Thereafter, PVD 804 is generated and written into a new session (S1204).

  Further, appropriate management information 808 is generated and written into a new session (S1205, S1206).

  Finally, the process when the new session is closed and the writing is interrupted is completed (S1207).

  FIG. 13 is a flowchart showing a process for generating appropriate management information 808. This process corresponds to S1205 in FIG.

  The interruption control unit 1022 generates appropriate management information 808 (S1301).

  That is, first, the interruption control unit 1022 refers to the written information 701, specifies a directory record 806 to be written, and generates a path table 805 (S1302).

  Next, the interruption control unit 1022 selects one directory included in the write target data 201 and determines whether to generate the directory record 806 (S1303, S1304). As described above, this determination is made by referring to the write success / failure information 702 in the written information 701 of the corresponding directory.

  When the directory record 806 is generated for the selected directory (S1304: YES), as described above, the directory record 305 and the file body 306 that have been written before being interrupted with reference to the written information 701 are referred to. And the position of the file body 306 are acquired, and a directory record 806 is generated (S1305). Note that the FAT entry 203 is also referred to when the directory record 806 is generated.

  When the directory record 806 is not generated for the selected directory (S1304: NO), or when the generation of the directory record 806 is completed, whether or not the processing of S1303 to S1305 has been performed for all the directories included in the write target data 201 (S1306). If not performed for all directories (S1306: NO), the processing of S1303 to S1305 is repeated for all directories. If not (S1306: YES), the generation process of the appropriate management information 808 is completed (S1307).

  As described above, by writing appropriate management information to a new session, when writing data to a recording medium in units of sessions, even if the writing is interrupted, the written file itself is restored. It becomes accessible.

  The above-described embodiments of the present invention are examples for explaining the present invention, and are not intended to limit the scope of the present invention only to those embodiments. The present invention can be implemented in various other modes without departing from the gist thereof.

  That is, the written information is not limited to the format shown in the present embodiment. For example, the format of a directory record to be regenerated as appropriate management information can be used as it is. In this case, the amount of information stored in the memory becomes large, but since the written information becomes the appropriate management information as it is, the processing load for generating the appropriate management information is reduced.

It is a functional block diagram of the media writing apparatus which concerns on one Embodiment of this invention. It is an example of the write target data according to an embodiment of the present invention. It is an example of the data written in CD concerning one Embodiment of this invention. It is an example of PVD which concerns on one Embodiment of this invention. It is an example of the path table which concerns on one Embodiment of this invention. It is an example of the directory record which concerns on one Embodiment of this invention. It is an example of the written information which concerns on one Embodiment of this invention. It is an example of the data newly written after the interruption concerning one embodiment of the present invention. It is an example of PVD newly written after interruption according to an embodiment of the present invention. It is an example of the path table newly written after interruption according to an embodiment of the present invention. It is an example of the directory record newly written after interruption based on one Embodiment of this invention. It is a flowchart which shows a process when the writing which concerns on one Embodiment of this invention is interrupted. It is a flowchart which shows the production | generation process of the appropriate management information which concerns on one Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 101 ... Media writing device, 102 ... Controller, 103 ... Memory, 104 ... User I / F, 105 ... Memory card reader / writer, 106 ... CD reader / writer, 107 ... Memory card, 108 ... CD, 201 ... Data to be written 202 ... directory entry, 203 ... FAT entry, 204 ... directory information, 205 ... directory entry, 301 ... data to be written, 307 ... management information, 601 ... detailed information, 701 ... written information, 702 ... write success / failure information, 703 ... File information, 704 ... Total number of writes, 705 ... First start sector number, 801 ... Data written after interruption, 808 ... Appropriate management information

Claims (5)

Writing means for writing data to the media in session units;
Means for storing information for identifying data written to the medium by the writing means;
Means for generating management information relating to written data with reference to the storage means when the writing means interrupts the writing according to a predetermined interruption instruction during writing of one session and closes the session; Prepared,
The media writing apparatus characterized in that the writing means writes the management information to the media as a session different from the closed session.   2. The media writing according to claim 1, wherein the management information is a directory record indicating a position of a file body in which writing has been completed in writing of the one session, and a path table indicating a position of the directory record. apparatus. Information for specifying the data written on the medium is:
Write success / failure information indicating whether writing has been completed for all file bodies included in the data to be written and whether writing has been completed for directory records of all directories included in the data to be written;
2. The media writing apparatus according to claim 1, further comprising: file information indicating a writing position on the medium of the file body in which the writing has been completed.   The information for specifying the data written on the medium includes information indicating the writing position on the medium of the directory record of each directory, and information under each directory for all directories included in the data to be written. 2. The media writing apparatus according to claim 1, further comprising: a directory record of a child directory in which writing has been completed among the child directories and file bodies in the directory and a total number of writes indicating the number of file bodies. A computer program for enabling reference to data that has been written when writing to the medium is interrupted,
Writing data to the media in session units;
Storing information for specifying data written to the medium in the writing;
When the writing is interrupted according to a predetermined interruption instruction during the writing of one session and the session is closed, the information related to the written data is referred to by referring to the information for specifying the data written to the stored medium. Generating management information;
A computer program, comprising: writing the management information to the medium as a session different from the closed session.

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