JP6670995B2 - Information recording apparatus and information recording method - Google Patents

Description

  The present disclosure relates to an information recording apparatus and an information recording method for determining whether or not target data to be recorded on a write-once optical disc can be erased from the write-once optical disc after recording.

  A write-once optical disc such as a DVD-R or a BD-R is a recording medium on which a recording mark once recorded cannot be rewritten. Patent Document 1 discloses an information recording / reproducing apparatus for erasing data recorded on a write-once optical disc.

  The information recording / reproducing apparatus disclosed in Patent Document 1 generates processed data obtained by processing recording data to be recorded on a recording medium, and data for generating restoration data necessary for restoring the recording data from the processed data. It has processing means. The information recording / reproducing apparatus may further include a recording unit that separately records the recording data as the processed data and the restoration data at different positions on the recording medium, and a recording medium that erases the recording data. And an erasing means for making the restoration data recorded in the storage device unreadable. With this configuration, it is possible to erase data recorded on the write-once recording medium so that the data cannot be completely read.

JP-A-2005-038490

  The present disclosure provides an information recording apparatus and an information recording method for determining whether or not target data to be recorded on a write-once optical disc group can be erased from the write-once optical disc group after recording.

  In a first aspect of the present disclosure, an information recording device that records information on a write-once optical disc group is disclosed. The write-once optical disc group includes one or more write-once optical discs. The information recording apparatus determines, from the size of the spare area of the write-once optical disc group, a first consumption size that is the size of the spare area consumed when erasing data that has been erased after being recorded on the write-once optical disc group. When the data recorded on the write-once optical disc group but not yet erased is to be erased, the replacement corresponding to subtracting the second consumption size, which is the size of the replacement area estimated to be consumed, is performed. Calculate the remaining capacity of the area. When recording new data on the write-once optical disc group, the information recording apparatus assumes that the new data is erased after being recorded on the write-once optical disc, and the replacement area is assumed to be consumed at that time. The third consumption size, which is the size, is calculated. The information processing device compares the remaining capacity of the replacement area with the third consumption size, and records new data if the remaining capacity of the replacement area is equal to or larger than the third consumption size.

  The information recording device and the information recording method according to the present disclosure can record on a write-once optical disc group by determining whether target data to be recorded can be erased after recording.

Hardware configuration diagram of the information recording device of the present embodiment Functional configuration diagram of the information recording device of the present embodiment Diagram explaining the data structure of file information in the database Diagram showing logical configuration of optical disk Diagram showing logical configuration of optical disk Diagram illustrating changes in status on disk when file is updated Flow chart showing file update processing Diagram illustrating changes in directory structure due to file deletion Flowchart showing file deletion processing Flowchart showing file physical erasure processing Diagram illustrating changes in status on disk when file is erased Diagram illustrating changes in status on disk when file is erased Diagram illustrating physical erasure of data in the recording layer of a write-once optical disc Flowchart showing a scheduled synchronization process and a physical erasure process performed along with the synchronization process Flowchart showing recording processing of target data in the virtual file system Diagram explaining the criteria for determining whether the target data can be physically erased FIG. 3 is a diagram for explaining an outline of processing when erasing target data in an optical disk RAID system Flowchart showing a process for estimating the size of a replacement area consumed when erasing target data

  Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, an unnecessary detailed description may be omitted. For example, a detailed description of a well-known item or a redundant description of substantially the same configuration may be omitted. This is to prevent the following description from being unnecessarily redundant and to facilitate understanding by those skilled in the art.

  The inventors provide the accompanying drawings and the following description so that those skilled in the art can fully understand the present disclosure, and they are intended to limit the subject matter described in the claims. is not.

(Embodiment 1)
[1-1. Constitution]
[1-1-1. Information recording device]
FIG. 1 is a diagram illustrating a configuration of an information recording system 100 according to the present embodiment. 1, the information recording system 100 includes an information recording device 20 and a storage device 50. The information recording system 100 is connected to the client terminal 10 via a network 200.

  The client terminal 10 is a computer that uses functions and data provided by the information recording system 100 according to a user operation. The client terminal 10 issues a command for recording a file (data) to the storage device 50 and a command for reading a file (data) recorded in the storage device 50 to the information recording system 100 according to a user operation. I do.

  The information recording device 20 controls the storage device 50 in accordance with a command received from the client terminal 10 to record data on a recording medium (optical disk) in the storage device 50 and read data.

  The information recording device 20 includes a control unit 21 that controls the overall operation of the information recording device 20, a display unit 23 that displays various information, an operation unit 24 that receives a user operation, and a data storage unit that stores data and programs. 22. Further, the information recording device 20 includes a communication interface 26 for connecting an external device and a network interface 25 for connecting to the network 200.

  The display unit 23 includes, for example, a liquid crystal display or an organic EL display. The operation unit 24 includes various members operated by the user, such as a keyboard, a mouse, a touch pad, a touch panel, and buttons.

  The communication interface 26 is a circuit (module) for connecting the storage device 50 to the information recording device 20. The communication interface 26 performs communication according to a communication standard such as SAS (Serial Attached SCSI).

  The network interface 25 is a circuit (module) for connecting the information recording device 20 to a network (for example, LAN or WAN) via a wireless or wired communication line. The network interface 25 performs communication conforming to communication standards such as IEEE802.3, IEEE802.11a / 11b / 11g / 11ac, and WiFi.

  The data storage unit 22 is a recording medium that stores parameters, data, control programs, and the like necessary to realize a predetermined function, and is configured by a hard disk (HDD). The data storage unit 22 may be configured by a semiconductor storage device (SSD). The data storage unit 22 stores a database (described later) and also operates as a cache (described later) that temporarily stores data to be recorded on the optical disc and data read from the optical disc.

  The control unit 21 includes a CPU or an MPU, and realizes a predetermined function by executing a control program (software). The control program is stored in the data storage unit 22, for example.

  In addition, the information recording device 20 includes a RAM (not shown) configured by a semiconductor device such as a DRAM or an SRAM. The RAM temporarily stores data and also functions as a work area for the control unit 21.

  The storage device 50 is a device that stores an optical disk 101 as a recording medium and records and reproduces data on and from the optical disk 101 under the control of the information recording device 20. The storage device 50 includes a control unit 52, a changer 54, and an optical disk drive 56. The control unit 52 controls the operation of the entire storage device 50. The control unit 52 includes a CPU or an MPU, and realizes a predetermined function by executing a control program (software). Alternatively, the function of the control unit 52 may be realized by the control unit 21. The optical disk drive 56 is a device that writes data to the optical disk 101 and reads data from the optical disk 101. The changer 54 is a device for loading the optical disk 101 into the optical disk drive 56. The optical disc is a write-once optical disc such as a DVD-R or a BD-R.

  FIG. 2 is a diagram showing a functional configuration of the information recording device 20 of the present embodiment. Each configuration (function) of the information recording device 20 illustrated in FIG. 2 is realized by the control unit 21 executing a control program.

  The client terminal 10 receives a user operation using a Web browser such as Internet Explorer (Microsoft) as a GUI. The user can perform operations (instructions) for recording, moving, and reproducing data on the information recording system 100 (optical disc 101) via such a GUI. In this case, the client terminal 10 transmits information based on the HTTP (Hypertext Transfer Protocol) to the information recording system 100. In addition, the client terminal 10 can instruct the information recording system 100 (optical disc 101) to record or delete data using a file system (FS) access user interface (GUI). In this case, the client terminal 10 transmits a command based on CIFS (Common Internet File System) to the information recording device 20.

  The HTTP module 31 has a function of receiving information transmitted from the client terminal 10 according to the HTTP protocol. The CIFS module 32 has a function of receiving a command or data based on the CIFS received from the client terminal 10. For example, a delete command for deleting a file may be received via the HTTP module 31, and a command for updating (rewriting) the file may be received via the CIFS module 32.

  The cache 34 is means for temporarily storing data to be written to the optical disk 101 and data read from the optical disk 101. The cache 34 is realized by the data storage unit 22.

  The virtual file system 35 is a file system that manages files (data) stored in the cache 34. The virtual file system 35 is a file system that is scheduled to be changed based on an instruction from the client terminal 10, but is not actually changed, and logically manages the state of a file on the optical disk 101.

  The Web application 36 is a function that implements main operations of the information recording device 20 described below.

  The UDF (Universal Disk Format) 37 is a file system that manages files (data) recorded on the optical disc 101.

  The scheduler 38 has a function of executing file synchronization processing (details will be described later) on the optical disc 101 according to a schedule. The schedule is set by, for example, an administrator, and a time zone (start time and end time) in which the synchronization process is performed on the optical disc 101 is set. According to the set schedule, a synchronization process is performed on the optical disc 101 to reflect the data stored in the virtual file system 35 and the cache 34 on the optical disc 101. In the present embodiment, a file physical erasure process is also executed in the synchronization process by the scheduler 38.

  The database (DB) 33 manages file information including information related to the history of files recorded on the optical disc 101, and history information. The file information manages, for example, whether or not a file recorded on the optical disc 101 is to be deleted. The file information manages whether or not the file recorded on the optical disc 101 is a history file. Here, the history file is a file that was valid in the past but has been invalidated by updating or deleting the file. The file information manages whether or not the file recorded on the optical disk 101 is a synchronized file. Here, the term “synchronization” means that the state managed by the virtual file system 35 for a certain file is reflected on the optical disc 101. The history information manages the correspondence between a certain file and a history file related to the file, and refers to information that the file has been physically erased and information that includes a plan to physically erase the file in the future.

  FIG. 3 shows a configuration example of the file information stored in the database 33. The file information manages, for each file recorded on the optical disc 101, a file ID, a file name, a path indicating a file storage location, an erasure flag, and a history flag. The deletion flag is a flag indicating whether the file is a file to be deleted. When the value of the flag is “0”, it indicates that the file is not to be deleted, when “1”, it indicates that the file is to be deleted, and when “2”, the file has been deleted. Indicates that The history flag is a flag indicating whether or not the file is a history file. When the value of the flag is "0", it indicates that the file is not a history file, and when it is "1", it indicates that the file is a history file.

[1-1-2 Optical Disk]
4A and 4B are diagrams showing a logical configuration of the optical disc. The optical disc 101 in the present embodiment is a write-once recording medium. FIG. 4A is a diagram illustrating an area of the optical disc 101 according to the present embodiment. The disc-shaped optical disc 101 has one or more recording layers on which information can be recorded and reproduced. In this recording layer, a groove (groove) is formed spirally from the center, and a track is formed in either the groove (groove) or the land (region between the grooves). Each track includes a plurality of subdivided blocks 403. Grooves (grooves) of tracks are formed by wobbling, and the wobbling is provided with address information (hereinafter referred to as “physical address”) indicating a detailed position on the disk. The recording density of the track may be improved by providing the track on both the groove and the land and recording the information.

  The track width (track pitch) is, for example, 0.32 μm for a Blu-ray (registered trademark) disc (BD).

  The block 403 is a unit of error correction, and is a minimum data unit in which recording and reproduction operations are performed. The block 403 is, for example, 32 KB for a DVD and 64 KB (= 1 cluster) for a BD. When expressed in sectors (2 Kbytes), which is the minimum unit of data management of the optical disc 101, one cluster = 32 sectors. In the following, “cluster” and “block” are used interchangeably.

  The optical disc 101 includes a lead-in area 404, a data area 405, and a lead-out area 406. FIG. 4B is a diagram showing an area structure of the optical disc 101. The data area 405 includes a user data area 405-2 in which user data is recorded, and an internal spare area 405 having a spare area used for replacement recording of a defective area detected in the user data area 405-2. 1 and an external spare area 405-3.

  The lead-in area 404 and the lead-out area 406 mainly include an area for recording management information necessary for recording and reproducing on the optical disc 101. The lead-in area 404 and the lead-out area 406 function as margin areas for enabling the optical head 103 to follow a track even when the optical head 103 overruns when accessing the end of the data area 405. Fulfill.

  The lead-in area 404 is an area where recording and reproduction are performed as needed. The lead-in area 404, unlike the user data area 405-2, is an area in which the user cannot directly record and reproduce. The lead-in area 404 includes areas such as a BCA (Burst Cutting Area), a drive area (Drive Area), and a DMA (Defective Management Area; defect management area).

  The BCA is a pre-recording area formed on a barcode including disc-related information and information unique to each disc by using a special device at the stage of manufacturing the optical disc 101. For example, the reflection film is removed by laser. This is an area formed by In the BCA, for example, information such as a serial number unique to every optical disk 101 is stored.

  The drive area is an area in which the information recording system 100 (storage device 50) can freely record information and the like necessary for control of its own device.

  The management information area is an area in which management information such as information on the area structure of the data area 405 on the optical disc 101, information on defective blocks, or information indicating the recording state of the optical disc 101 can be recorded.

  Note that the lead-in area 404 of the optical disk 101 may further include an area such as an OPC (Optimum Power Control) area for adjusting the recording power of the optical disk drive 56 and a PreWrite area for performing tracking / focus adjustment. Good.

[1-2. motion]
The operation of the information recording system 100 configured as described above will be described. When the client terminal 10 receives a user operation such as recording or reproducing a file on the information recording system 100, the client terminal 10 transmits information indicating the operation (hereinafter referred to as “command”) to the information recording device 20. The information recording device 20 of the information recording system 100 receives a command from the client terminal 10. The control unit 21 of the information recording device 20 instructs the storage device 50 according to the received command. The storage device 50 (control unit 52) records and reproduces data on the optical disc 101 in accordance with an instruction from the information recording device 20.

[1-2-1. Synchronous processing]
The information recording system 100 according to the present embodiment adds a new file, rewrites (updates) a part of a file, or deletes a file on the optical disc 101 as a recording medium according to a command from a client terminal. In this case, before adding a file to the optical disc 101, data (file) to be recorded or updated is temporarily recorded in the cache 34.

  That is, the cache 34 is initially loaded with all data recorded on the optical disc 101. Thereafter, according to the command received from the client terminal 10, addition, update, deletion, etc. of the file are performed on the cache 34. The management of the files on the cache 34 is performed by the virtual file system 35. Thereafter, a process (referred to as “synchronous process”) of reflecting the state of the data on the virtual file system 35 and the cache 34 on the optical disc 101 is performed. The storage state of the file (data) managed by the virtual file system 35 is reflected on the optical disk 101 by the synchronization processing, and the optical disk 101 is in a state in which the file has been added, updated, or deleted according to a command from the client terminal 10.

  As described above, in the information recording system 100, when a command is received from the client terminal 10, the data is once updated on the cache 34, and then the synchronization process is performed on the optical disc 101. The contents are reflected on the optical disk 101. Thus, when a command is received a plurality of times, the data is updated on the cache 34 a plurality of times, and then the synchronization process is performed only once on the optical disc 101, whereby the processing by the command for the plurality of times can be performed on the optical disc 101. Can be reflected. Therefore, the frequency of loading the optical disc 101 into the optical disc drive 56 can be reduced, and the efficiency of the recording process on the optical disc 101 can be improved.

[1-2-2. File Update]
In the present embodiment, since the optical disk 101 is a write-once optical disk, data once recorded on the optical disk 101 cannot be updated (rewritten) or erased at the same physical position on the disk. . Hereinafter, a file update process for the optical disc 101 in the information recording system 100 will be described.

  The information recording device 20 of the information recording system 100 receives from the client terminal 10 an update command for rewriting a part of the file. In the update command, the file name of the file to be updated, the position of the data to be updated, the length of the data to be updated, and the data to be updated are specified.

  When receiving the update command from the client terminal 10, the information recording device 20 first updates the data in the cache 34 and updates the virtual file system 35 according to the update command.

  After that, the information recording device 20 executes a synchronization process on the optical disc 101 in order to reflect the status of the file managed by the cache 34 and the virtual file system 35 on the optical disc 101.

  The process on the optical disc 101 when updating (rewriting) a file (referred to as “target file”) already recorded in the user data area of the optical disc 101 will be specifically described with reference to FIG.

  When updating the target file 61a, first, the target file 61a is updated (rewritten) according to the update command, and a new file (hereinafter, referred to as an "updated file") 61b is generated. Then, the updated file 61b is recorded in a free area (an area different from the area where the original target file 61a is recorded) in the user data area. At this time, since the recording location of the file 61b is changed, the contents of the file entry (FE) information in the file system for managing the files in the optical disc 101 are rewritten, and the rewritten file entry information 63a is rewritten in the user data area. It is recorded in a predetermined free area (an area different from the original file entry information).

  Further, the target file 61a as the update source of the file 61b is renamed, and the storage location is changed from the current folder to the trash folder. Here, the trash folder is an example of a folder for storing files that have been logically invalidated by erasure or the like. That is, on the optical disk 101, the data of the renamed original target file 61a exists as it is. Such data of the original target file 61a is managed on the database 33 as a "history file". The file tree information of the history file (original target file 61a) is changed so as to be stored in the trash folder, and the changed file tree information 63b is recorded in a free area. In this state, the user can confirm the history file (the original target file 61a) by referring to the trash folder in the optical disc 101.

  The correspondence between the updated file 61b and the related history file (the original target file 61a) is managed by history information in the database 33. Further, a plurality of file entry information and file tree information in the optical disc 101 are generated with the update of the file, and information indicating the latest file entry information and file tree information is used as management information (not shown), for example, in the optical disc 101. It is stored in the lead-in area.

  As described above, according to the information recording device 20 of the present embodiment, the file before updating is changed to a history file by updating the file, and the history file is stored in the trash folder.

  With reference to the flowchart of FIG. 6, the flow of a process of updating a file recorded on the optical disc 101 will be described.

  When receiving the update command from the client terminal 10 (S11), the control unit 21 of the information recording device 20 first updates the file according to the update command to update the cache 34 and the virtual file system 35 (S12-S13). ). Specifically, the control unit 21 renames the file name of the file (original file) specified as the update target, and updates the virtual file system 35 so that the renamed original file is stored in the trash folder ( S12). Further, the control unit 21 newly adds the updated file on the cache 34 and the virtual file system 35 according to the update command (S13).

  For example, an example will be described in which an update command for a file with the file name “C.sh” stored in the folder “@CC” is received. The control unit 21 renames the file name “C.sh” of the file to be updated to “C.1.sh” and moves the original file having the renamed file name “C.1.sh” to the trash folder. . Further, the control unit 21 updates the file to be updated according to the command to generate new data (file), and uses the newly generated data (file) as an updated file having the file name “C.sh”. , The cache 34 and the virtual file system 35. As a result, on the cache 34, the updated data with the file name "C.sh" is recorded in the folder "$ CC", and the original data with the file name "C.sh.1" is stored in the trash folder. The file is recorded.

  After that, a synchronization process is performed to synchronize (match) the logical state of the optical disk 101 managed by the virtual file system 35 with the actual physical state of the optical disk 101. The synchronization process may be executed at a timing arbitrarily designated by the user, may be continuously executed after the process related to the update to the virtual file system 35, or when the time set by the scheduler 38 function is reached. May be executed.

  In the synchronization process, the control unit 21 issues an instruction to the storage device 50 to record the updated file on the optical disk 101 based on the state of the file managed by the virtual file system 35 and the cache 34 (S14). Thereby, for example, as shown in FIG. 5, the data of the updated file 61b is recorded in a free area (an area different from the area where the original target file 61a is recorded) on the optical disc 101.

  Next, the control unit 21 changes the file entry information for the original file on the optical disc 101 (S15). Specifically, the control unit 21 renames the file name of the original file and changes the file entry information so that the storage location is changed to the trash folder. The changed file entry information is recorded in an area different from the original file entry.

  Further, the control unit 21 changes the file tree information for the original file (S16). That is, the control unit 21 changes the file tree information of the original file so that the original file is stored in the trash folder, and records the changed file tree information in an area different from the original file tree information.

  Thereafter, the control unit 21 registers the original file as a history file in the database 33 (S17). For example, in FIG. 3, when the original file having the file name "C.sh" is updated, the file name of the original file is changed to "C.1.sh" and the storage location is changed to the trash folder ({CC}). It is changed to the trash can (C.1.sh), the history flag is set to "1", and registered in the database 33.

  As described above, the entity data of the updated file is newly recorded on the optical disc 101, and the original file before the update is renamed and moved to the trash folder. In this state, the user can confirm that the original file exists in the trash folder by browsing the trash folder of the optical disc 101 through the virtual file system 35 or the UDF on the client terminal 10.

[1-2-3. File erase]
The file erasure by the information recording system 100 of the present embodiment will be described. When receiving the erasure command from the client terminal 10, the information recording device 20 of the information recording system 100 first logically erases the erasure target file. Here, logically deleting means moving the storage location of the file to the trash folder on the virtual file system 35. In a state where the file is logically erased, the actual data of the file is effectively present on the optical disk 101, so that the data of the file can be reproduced (read).

  In the logical erasure, the information recording apparatus 20 moves the erasure target file to the trash folder on the virtual file system 35, and sets the erasure flag to “1” for the erasure target file and the related history file (hereinafter, “1”). This is simply referred to as “setting the erase flag to 1”). For example, as shown in FIG. 7A, Data000. In the state where the file of Bin is stored, Data000. When an erasing command for erasing the bin is received, as shown in FIG. Bin files are logically deleted and moved to the trash folder. In this state, the user browses the trash folder to obtain Data000. The existence and content of the bin file can be confirmed.

  After that, the information recording device 20 performs a synchronization process on the optical disk 101, and reflects the disk state managed by the virtual file system 35 on the optical disk 101. As a result, the file to be erased is moved to the trash folder along with the history file on the optical disc 101. After that, the information recording device 20 performs physical erasure on the file for which the erasure flag is set. Physical erasure is to overwrite the data of the erasure target file so that the file cannot be played. After physical erasure, the user can confirm the existence of the erased file by browsing the trash folder, but cannot reproduce (read) the data of the erased file. For example, as shown in FIG. When the file of bin is physically erased, Data000.bin is deleted. The file name of the bin file can be confirmed in the trash folder, but the data cannot be read (that is, it has been substantially deleted). However, it may not be possible to confirm the existence of the physically deleted file on the virtual file system. The erase flag is set to “2” for the physically erased file and the physically erased history file related thereto (hereinafter, this is simply referred to as “set the erase flag to 2”).

  FIG. 8 is a flowchart showing the flow of the above-described file erasing process. The erasing process of the information recording device 20 will be described more specifically with reference to the flowchart of FIG.

  When the control unit 21 of the information recording device 20 receives from the client terminal 10 an erasure command specifying the erasure target file (S31), the control unit 21 logically erases the erasure target file on the virtual file system 35 (S32). Specifically, on the virtual file system 35, the deletion target file is moved from the folder in which the deletion target file is currently stored to the trash folder.

  Next, the control unit 21 sets an erasure flag of the erasure target file on the file information of the database 33 (that is, sets the value of the erasure flag to “1 (erasure target)”) (S33). Further, the history flag of the file to be deleted is set (that is, the value of the history flag is set to “1 (history file)”) (S33).

  Further, the control unit 21 refers to the history information in the database 33 and searches for a history file related to the file to be deleted (S34). When at least one history file is found (YES in S35), the control unit 21 sets an erasure flag for the found history file in the file information of the database 33 (S36).

  As described above, upon receiving the erase command, the file to be erased is moved to the trash folder on the virtual file system 35, and the erase flag and the history flag are set. Further, the deletion flag is set to “1” also for the history file related to the deletion target file. In this state, it is only logically deleted on the virtual file system 35. Thereafter, the control unit 21 executes the physical erasure (S37).

  The operation of the physical erasure by the information recording device 20 will be described with reference to the flowchart of FIG. The physical erasure is executed at an arbitrary timing according to a user's instruction or based on a preset schedule or the like.

  The control unit 21 of the information recording device 20 instructs the control unit 52 of the storage device 50 to change the file entry information on the optical disk 101 based on the virtual file system 35 (S51). Further, the control unit 21 of the information recording device 20 instructs the control unit 52 of the storage device 50 to change the file tree information on the optical disk 101 based on the virtual file system 35 (S52). That is, the control unit 21 of the information recording device 20 instructs the control unit 52 of the storage device 50 to change the file tree information so that the storage location of the deletion target file is the trash folder.

  The control unit 52 of the storage device 50 changes the file entry information and the file tree information based on the instruction from the control unit 21 of the information recording device 20. At this time, as shown in FIG. 10A, the control unit 52 of the storage device 50 stores the changed file entry information 63a and the changed file tree information 63b on the optical disc 101 as the original file entry information and the original file tree. The information is recorded in an area different from the area where the information is stored. At this time, the entity data of the file to be deleted is not changed.

  Then, the control unit 21 of the storage device 50 refers to the file information of the database 33 and physically deletes the file whose deletion flag is set to “1” with reference to the file information of the database 33. (S53). The control unit 52 of the storage device 50 receives the instruction and physically erases the file on the optical disk 101.

  Physical erasure is realized by making a file to be erased unplayable. For example, by overwriting at least a part of data of a file to be erased with a predetermined erasing pattern, the file is made unplayable. That is, the file to be deleted is made unreproducible by overwriting at least one of the entity data, the synchronization data, and the error correction data of the file to be deleted with a predetermined deletion pattern. For example, as shown in FIG. 11, the overwriting is performed by transforming the recording marks constituting the data of the file to be erased into longer recording marks in the recording layer of the optical disc 101. By deforming the recording mark, it becomes impossible to read the file thereafter, and the file is substantially erased.

  As described above, after physical erasure is performed on a file for which the erasure flag is set to “1”, the erasure flag is set to “2”. After this, it becomes impossible to read the file on which the physical erasure has been performed. The timing of the physical erasure may be performed at a timing arbitrarily specified by the user, may be performed at a timing scheduled in advance, or may be performed at the same time as the synchronization process is performed. .

  Hereinafter, with reference to FIG. 12, a description will be given of a process in a case where physical erasure is performed in a synchronization process performed at a previously scheduled timing.

  The control unit 21 uses the function of the scheduler 38 to determine whether the current time has reached the time at which the synchronization process starts (S61). When determining that the current time has reached the start time of the synchronization process (S61), the control unit 21 starts the synchronization process.

  First, the control unit 21 checks with the storage device 50 whether the optical disk 101 is online (that is, whether the optical disk 101 is loaded in the optical disk drive 56) (S62). When the optical disk 101 is not in the online state, the control unit 21 instructs the storage device 50 to load the optical disk 101 into the optical disk drive 56 (S65).

  Thereafter, the control unit 21 performs a synchronization process on the optical disc 101 according to the virtual file system 35 and the cache 34 (S63). In the synchronization process, the control unit 21 adds a file (substance data), file entry information, file tree information, and the like on the optical disc 101 so that the state of the data managed by the virtual file system 35 is reflected on the optical disc 101. , Changes, etc. are made. For example, as shown in FIG. 5, for the updated file, the data of the updated file is newly recorded on the optical disc 101, and the original file before the update is renamed and stored in the trash folder. Thus, the file entry information and the file tree information are changed and newly recorded. As for the file to be deleted, as shown in FIG. 10A, the file entry information 63a and the file tree information 63b are changed on the optical disc 101 so that the file to be deleted is stored in the trash folder.

  As described above, regarding the erasure of a file, a synchronization process is executed, and only by reflecting the contents of the virtual file system 35, the erasure target file is logically erased. That is, the file to be erased has only been moved to the trash folder for management on the optical disc 101.

  After the completion of the synchronization processing, the control unit 21 refers to the file information of the database 33 to search for a file whose deletion flag is set to “1”, and physically deletes the searched file. (S64). In accordance with the instruction from the control unit 21 of the information recording device 20, the control unit 52 of the storage device 50 physically erases the instructed file on the optical disk 101 and sets the erase flag to “2”. The physically erased file cannot be read (see FIG. 10B).

[1-2-4. File Record]
With reference to FIGS. 13 and 14, a file recording method will be described as an example of a data recording method of the information recording device 20.

  When new data is recorded in the virtual file system 35, the control unit 21 refers to the file information of the database 33 and determines the size of the free spare area (the free capacity of the spare area) as the target data to be recorded. It is determined whether the size is larger than the size estimated to be consumed by the replacement recording when erasing after recording (S73 in FIG. 13). That is, the control unit 21 firstly deletes the erased size (the size of FIG. 14A), the first planned erase size (the size of FIG. 14B), and the second planned erase size (the size of FIG. 14). (Size of (C)) is calculated. The erased size (the size of (A) in FIG. 14) is the erased size consumed by replacement recording when data is erased from the optical disc 101. The first scheduled erasing size (the size of (B) in FIG. 14) is a size estimated to be consumed by replacement recording when erasing the data of the erasure flag “1”, which is to be erased from the optical disc 101. . The second planned erase size (the size (C) in FIG. 14) is consumed by replacement recording when erasing data of the erase flag “0” that has been recorded on the optical disc 101 and has not yet been erased and is not scheduled to be erased. Estimated size. Next, the control unit 21 calculates the size of the empty spare area (the size of S− (A + B + C) in FIG. 14) by subtracting these from the size of the spare area (the size of (S) in FIG. 14). Next, the control unit 21 determines whether or not the size of the empty spare area (the size of S− (A + B + C) in FIG. 14) is the size to be erased (the size of (P) in FIG. 14). The scheduled erasure size (the size of (P) in FIG. 14) is a size that is estimated to be consumed by replacement recording when the target data to be recorded is to be erased after being recorded on the optical disc 101.

  The size of the vacant spare area (the size of S− (A + B + C) in FIG. 14) is estimated to be consumed by replacement recording when the target data to be recorded is to be erased after being recorded on the optical disk 101 ( If the size is equal to or larger than ((P) size in FIG. 14) (Y in S73), the control unit 21 moves the target data to the virtual file system (S74). Otherwise (N of S73), the control unit 21 notifies the user that the size of the free replacement area is insufficient (S75).

  As described above, whether or not physical erasure is possible is determined based on the availability of the spare area before recording, so that it can be determined whether data to be recorded from now on can be surely physically erased later and recorded.

  In the present embodiment, the size of the spare area consumed at the time of data erasure is set as the first consumption size for data already recorded and erased on the write-once optical disc. In this case, the first consumption size is the first planned erase size described above.

  It is assumed that data that has already been recorded on a write-once optical disc and has not been erased is to be erased from the write-once optical disc. The size of the replacement area consumed by this erasing process is defined as a second consumption size. In this case, the second consumption size is the sum of the second planned erase size and the third planned erase size described above.

  Then, new data is recorded on the write-once optical disc. In this case, it is assumed that new data is once recorded on the write-once optical disc, and the data is erased from the write-once optical disc after recording. In this case, the size of the replacement area consumed for erasing the new data is defined as a third consumption size.

  As described above, in order for new data to be recorded / erased on the write-once optical disc, the first consumption size and the second consumption size are subtracted from the size of the replacement area, and the result of the subtraction is larger than the third consumption size. Then, after new data is recorded on the write-once optical disc, it can be erased.

  When the information recording apparatus of the present embodiment does not include the cache 34 and the virtual file system 35 as shown in FIG. 2, the information recording apparatus records new data directly on the write-once optical disc. Becomes

  On the other hand, when the information recording device includes the cache 34 and the virtual file system 35, there are further points to be considered in the above description.

  If the cache 34 and the virtual file system 35 are provided at the preceding stage of the write-once optical disc, other data that exists on the cache 34 and the virtual file system 35 but has not yet been recorded on the write-once optical disc may exist. There is. It is assumed that other data is erased after being recorded on the write-once optical disc. The size of the replacement area consumed by the other data erasing process is defined as a fourth consumption size.

  When recording new data on a write-once optical disc, the first consumption size, the second consumption size, and the fourth consumption size are subtracted from the size of the spare area, and the result of the subtraction is a size equal to or greater than the third consumption size. If so, new data is recorded in the cache 34 or the virtual file system 35.

  After that, data is recorded on the write-once optical disc based on the contents of the cache 34 and the virtual file system 35.

  Note that data recorded in the cache 34 or the virtual file system 35 and deleted from the cache 34 or the virtual file system 35 before data is recorded on the write-once optical disc is included in the above-mentioned fourth consumption size calculation target. Absent.

  In the above description, the case where a single write-once optical disc is used has been described as an example. However, the content of the invention described in this embodiment is not limited to this. The invention described in the present embodiment can be similarly implemented even if the above-mentioned write-once optical disc is replaced with a write-once optical disc group including one or more write-once optical discs.

  Further, in the above description, the case where a predetermined consumption size is subtracted from the replacement area has been described as an example, but the contents of the present embodiment are not limited to this. A value obtained by subtracting the first consumption size, the second consumption size, and the like from the size of the replacement area may be appropriately updated. In this case, by subtracting the third consumption size or the fourth consumption size from the updated value, it is possible to obtain a subtraction result equivalent to that described above.

  In the following, the first planned erase size (the size of (B) in FIG. 14), the second planned erase size (the size of (C) in FIG. 14), and the planned erase size (the (P) of FIG. 14) described above. The process of estimating the size of the replacement area consumed when erasing the target data, which is used for estimating the size, will be described with reference to FIG. An outline of a process for erasing target data in the optical disk RAID system, which is a premise of this estimation, will be described with reference to FIG.

  FIG. 15 shows a RAID5 system configuration using write-once optical disks 701, 702, 703, and 704 as an example of an optical disk RAID system. Sectors are arranged on the write-once optical disc. A sector is a minimum unit of data management of a write-once optical disc that constitutes a RAID system. For example, sectors of addresses D10, D11, D12, and D13 are arranged on the optical disk 701. Addresses A1 to A12 are assigned as a RAID system. Addresses P1, P2, P3, and P4 are sectors for storing parity, which is error correction information for ensuring the reliability of data included in other addresses of the corresponding stripe. Stripes are arranged in the RAID system. A stripe is a unit for ensuring redundancy. For example, the stripe 801 is composed of the sector of the address D10 of the optical disk 701, the address D20 of the optical disk 702, the address D30 of the optical disk 703, and the address D40 of the optical disk 704. In the example of FIG. 15, file 1 is recorded in the sector group 901 and file 2 is recorded in the sector group 902.

  That is, the RAID system described in the present embodiment is a write-once optical disc group including a plurality of write-once optical discs.

  When reading the file 2 from the RAID system, the contents of the sector at the addresses A2, A3, A4, A5, and A6 of the RAID system may be read. This corresponds to reading the address D11 of the optical disk 701, the addresses D20 and D21 of the optical disk 702, the address D30 of the optical disk 703, and the address D41 of the optical disk 704. If the address A6 cannot be reproduced, the RAID system restores and reproduces the contents of the address A6 from the contents of the addresses A4 and A5 and the contents of the parity P2 in the stripe 802 to which the address A6 belongs. In other words, even if reading from one optical disk is impossible, the RAID system secures redundancy that enables reading.

  When erasing file 2, all sectors on which at least part of file 2 is recorded are overwritten on all optical disks. In the example of FIG. 15, the sector at the addresses A2 to A6 in which the file 2 is stored is overwritten. When erasing the file 2, the sector including all the parities of all the stripes including the file 2 is overwritten. In the example of FIG. 15, the sector at the address P1 of the stripe 801 and the sector at the address P2 of the stripe 802 are overwritten. When another stripe is included in the stripe including the file 2, all the overwritten sectors among the sectors of the stripe are alternately recorded. In the example of FIG. 15, the stripe 801 includes a file 1 other than the file 2 in addition to the file 2. Therefore, the sectors of the addresses A2, A3, and P1 overwritten among the sectors of the stripe 801 are alternately recorded. Specifically, of the sectors of the stripe 801, the sectors at addresses A 2 and A 3 where the file 2 was included are alternately recorded at the addresses D 2 S 0 and D 3 S 0 of the optical disk 702. At this time, with respect to the sector at the address A2, all the recorded portions of the file 2 are replaced with 00H data for replacement recording, and for the portions where the file 1 is recorded, the original data of the original file 1 are replaced and recorded. Further, of the sectors of the stripe 801, the sector including the parity of the address P 1 is alternately recorded at the address D 4 S 0 of the optical disk 702. At this time, the parity is recalculated based on the data of the alternately recorded sector and is alternately recorded. As described above, when the file 2 is erased, of the stripe 801 including the file 2 and the file other than the file 2, the size of the sector including the file 2 (the sector at the addresses A2 and A3) and the sector including the parity (the sector at the address P1) ) Is alternately recorded, and an alternate area having the same size as the total size is consumed.

  With reference to the configuration example of FIG. 15 and the flowchart shown in FIG. 16, a process of estimating the size X of the replacement area consumed when erasing the target data will be described. First, all stripes including both the target data and the data other than the target data are specified (S81). For example, when the target data is file 2 in the configuration of FIG. 15, the corresponding stripe is stripe 801. Next, the total X1 of the sizes of the sectors including the target data of all the stripes specified in S81 is obtained (S82). For example, if the target data is file 2 in the configuration of FIG. 15, X1 is the size of two sectors at addresses A2 and A3. Further, a total X2 of the sizes of the sectors including the parities of all the stripes specified in S81 is obtained (S83). For example, when the target data is file 2 in the configuration of FIG. 15, X2 is the size of one sector of the address P1. Then, the size X of the replacement area to be consumed can be estimated as X = X1 + X2 (S84). For example, when the target data is file 2 in the configuration of FIG. 15, X has a size of three sectors.

  More specifically, the control unit 21 of the information recording device 20 calculates the erased size from, for example, an erase history.

  The control unit 21 of the information recording device 20 estimates the first planned erase size (the size of (B) in FIG. 14) according to the flow illustrated in FIG. 16 with the data of the erase flag “1” as the target data. That is, the control unit 21 deletes all stripes including both data to be erased from the optical disks 701, 702, 703, and 704 and data other than data to be erased from the optical disks 701, 702, 703, and 704. Identify. Then, the control unit 21 sets the first erasure scheduled size to the total size of the sector, which is the minimum unit of data management including data to be erased from the optical disks 701, 702, 703, and 704, of all the specified stripes. It is calculated by adding the total size of the sector, which is the minimum unit of data management including parity.

  The control unit 21 of the information recording device 20 estimates the second planned erase size (the size of (C) in FIG. 14) by using the data of the erase flag “0” as the target data according to the flow illustrated in FIG. That is, the control unit 21 records the data recorded on the optical discs 701, 702, 703, and 704 and not yet erased and not scheduled to be erased, and the data recorded on the optical discs 701, 702, 703, and 704 but not erased and erased. Identify all stripes that contain both non-scheduled data. Then, the control unit 21 sets the second planned erasure size in the data management of all the specified stripes, including data that has been recorded on the optical discs 701, 702, 703, and 704 and has not been erased and is not scheduled to be erased. It is calculated by adding the total size of the sector which is the minimum unit and the total size of the sector which is the minimum unit of data management including parity.

  The control unit 21 of the information recording device 20 subtracts the known erased size (the size of FIG. 14A) and these sizes from the known size of the replacement area (the size of FIG. 14S). Thus, the size of the empty spare area (the size of S− (A + B + C) in FIG. 14) is obtained.

  In addition, the control unit 21 of the information recording device 20 sets the data to be recorded from now on the optical discs 701, 702, 703, and 704 as the target data, and executes the size shown in FIG. 14 (P) size). That is, the control unit 21 is configured to record data to be recorded from now on the optical discs 701, 702, 703, and 704 and data to be recorded from the optical discs 701, 702, 703, and 704. All stripes that include both data other than the above data are specified. Then, the control unit 21 determines the planned erase size (the size (P) in FIG. 14) when the target data to be recorded from all the specified stripes is recorded on the optical discs 701, 702, 703, and 704. It is calculated by adding the total size of the sector which is the minimum unit of data management including data and the total size of the sector which is the minimum unit of data management including parity.

  Then, the control unit 21 of the information recording device 20 determines whether physical erasure is possible or not based on the estimation based on the availability of the spare area before recording the data to be recorded. It can be determined whether the data to be erased can be physically erased later (S73 in FIG. 13, FIG. 14).

  When the information recording device includes the cache 34 and the virtual file system 35, the fourth consumption size should be considered. The estimation of the fourth consumption size also includes the first planned erase size (the size of FIG. 14B), the second planned erase size (the size of FIG. 14C), and the planned erase size (FIG. 14P). Size).

[1-3. Effects]
As described above, the information recording apparatus of the present embodiment is an information recording apparatus that records information on a write-once optical disc group. The write-once optical disc group includes one or more write-once optical discs. When recording new data, the control unit calculates the remaining amount of the spare area corresponding to subtracting the first consumption size and the second consumption size from the size of the spare area of the write-once optical disc group. . The information recording apparatus records the remaining data in the replacement area and the third consumption size. If the remaining capacity is equal to or larger than the third consumption size, the information recording apparatus records new data.

  If there is no storage unit such as a cache or a virtual file system, the information recording device directly records new data on a write-once optical disc group.

  Conversely, when the information recording device includes a storage unit such as a cache or a virtual file system, the first consumption size, the second consumption size, and the fourth consumption size are subtracted from the size of the spare area of the write-once optical disc group. Then, the remaining amount of the replacement area corresponding to the operation is calculated. The remaining amount is compared with the third consumption size. If the remaining amount is equal to or larger than the third consumption size, the information recording device records new data in the storage unit. After that, the data in the storage unit is reflected on the write-once optical disc group.

  According to the invention described in the present embodiment, when data is recorded on a write-once optical disc group, it can be determined whether or not the data can be actually erased after recording on the write-once optical disc group. . Therefore, it is possible to suppress the occurrence of the problem that data cannot be erased after recording on the write-once optical disc group.

  Furthermore, according to the invention described in the present embodiment, it is possible to appropriately cope with any case where the information recording device has a storage unit such as a cache or not.

(Other embodiments)
As described above, Embodiment 1 has been described as an example of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can be applied to embodiments in which changes, replacements, additions, omissions, and the like are made as appropriate. Further, a new embodiment can be obtained by combining the components described in the first embodiment.

  Therefore, other embodiments will be exemplified below.

  In the above embodiment, the control units 21 and 52 have been described as being CPUs or MPUs that realize predetermined functions in cooperation with software. However, the control units 21 and 52 may be realized by dedicated electronic circuits designed to realize predetermined functions. That is, the control units 21 and 52 can be realized by a CPU, an MPU, a DSP, an FPGA, an ASIC, or the like.

  In FIG. 1 of the above embodiment, the storage device 50 having only one optical disk 101 has been described for the sake of simplicity, but the storage device 50 stores a plurality of optical disks, and the changer 54 controls the optical disk drive. It is also possible to switch the optical disk to be loaded into the 56.

  In the above embodiment, the case where the present invention is implemented in the information recording apparatus has been described as an example, but the invention described in the present embodiment is not limited to this. It can also be realized as an information recording method using a device. In this case, the processing performed by the control units 21 and 52 and the like can be realized by constituting each step as a configuration step.

  As described above, the embodiments have been described as examples of the technology in the present disclosure. For that purpose, the accompanying drawings and the detailed description have been provided.

  Accordingly, among the components described in the accompanying drawings and the detailed description, not only those components that are essential for solving the problem, but also those that are not essential for solving the problem in order to exemplify the technology. May also be included. Therefore, it should not be immediately recognized that these non-essential components are essential based on the fact that the non-essential components are described in the accompanying drawings and the detailed description.

  Further, since the above-described embodiments are for exemplifying the technology in the present disclosure, various changes, replacements, additions, omissions, and the like can be made within the scope of the claims or the equivalents thereof.

  According to the present disclosure, it is applicable to an information recording device and an information recording method for recording data on a write-once optical disc.

Reference Signs List 10 client terminal 20 information recording device 21 information recording device control unit 22 data storage unit 33 database 34 cache 35 virtual file system 50 storage device 52 storage device control unit 54 changer 56 optical disk drive 100 information recording system 101, 701, 702, 703,704 optical disk 200 network

Claims (9)

An information recording apparatus for recording information on a write-once optical disc group,
The write-once optical disc group includes a plurality of write-once optical discs,
The plurality of write-once optical discs each constitute a user data area in which data is recorded, and a spare area used for replacement recording of a defective area detected in the user data area,
The information recording device includes a control unit that controls recording and erasure of data on the write-once optical disc group,
The control unit, when recording new data, from the size of the replacement area of the write-once optical disc group,
A first consumer size which is the size of the spare area which is consumed in the erasing data recorded to the recordable optical disc group,
A second consumer size which is the size of the spare area which is estimated to be consumed when erasing the data recorded to the recordable optical disc group,
Calculating a remaining amount of the spare area corresponding to the subtracting, the replacement area in which the remaining amount is estimated to be consumed when erasing the new data after recording the write-once optical disc group If the size is equal to or larger than the third consumption size, the new data is recorded.
Information recording device. Further, a storage unit for temporarily storing data recorded on the write-once optical disc group and data recorded on the write-once optical disc group,
The control unit, when recording the new data, from the size of the replacement area of the write-once optical disc group, the first consumption size, the second consumption size,
The size of a spare area that is temporarily stored in the storage unit and is estimated to be consumed when data that has not yet been recorded on the write-once optical disc group is erased after being recorded on the write-once optical disc group. A fourth consumption size,
Is calculated, and if the remaining amount is equal to or larger than the third consumption size, the new data is temporarily stored in the storage unit.
According to the data of the storage unit, record data on the write-once optical disc group,
The information recording device according to claim 1. The control unit, before recording data on the write-once optical disc group, removes the data deleted from the storage unit from the calculation target of the fourth consumption size,
The information recording device according to claim 2. If the remaining amount of the spare area is equal to or larger than the third consumption size, the control unit directly records the new data on the write-once optical disc group.
The information recording device according to claim 1. The write-once optical disc group is composed of a plurality of write-once optical discs,
The control unit manages the write-once optical disc group as a stripe extending over the plurality of write-once optical discs, records data and error correction information of the data on the stripe, and writes the write-once optical disc group. Is controlled as one virtual recording medium,
Furthermore, the control unit calculates the first consumption size based on a stripe recorded on the write-once optical disc group and both data of already erased data and other data are recorded,
The information recording device according to claim 2. The stripe is configured in units of sectors dispersed on a plurality of write-once optical disks,
The control unit is configured to record, among the stripes, a size of a sector in which the error correction information of the stripe is recorded, and both data already erased and already recorded on the write-once optical disc group and other data are recorded. Calculating the first consumption size based on the size of the sector that is located,
The information recording device according to claim 5. When erasing data recorded on the write-once optical disc group, the control unit estimates the second consumption size based on a stripe on which both the data to be erased and other data are recorded. Do
The information recording device according to claim 5. The control unit, when erasing data to be newly recorded on the write-once optical disc group from the write-once optical disc group, based on the stripe on which both the data and other data are recorded. 3 Estimate consumption size,
The information recording device according to claim 5. An information recording method for recording information on a write-once optical disc group,
The write-once optical disc group is a plurality of write-once optical discs,
The plurality of write-once optical discs each constitute a user data area in which data is recorded, and a substitute area used for substitute recording of a defective area detected in the user data area,
Calculating a first consumption size, which is the size of a replacement area of the write-once optical disc group consumed when data recorded on the write-once optical disc group is erased;
Calculating a second consumption size that is an estimated consumption size of the replacement area when erasing data recorded on the write-once optical disc group;
Calculating a third consumption size, which is a consumption size of the replacement area estimated when erasing the new data from the write-once optical disc group when new data is to be recorded on the write-once optical disc group; When,
Calculating the remaining amount of the replacement area corresponding to subtracting the first consumption size and the second consumption size from the size of the replacement area;
Recording the new data when the third consumption size is greater than or equal to the remaining amount;
An information recording method comprising:

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