JP2007128286A - Reproducing apparatus, reproducing method and reproducing program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To quickly read out data from a detachable recording medium even when the recording medium is replaced. <P>SOLUTION: A cache area 31 corresponding to a recording area of an optical disk 3 is secured in an HDD 4 and cache information 30 is prepared on the basis of the identification information of the optical disk 3. Data read out from the optical disk 3 are cached in the area 31 and a flag of a position corresponding to a sector read out from the optical disk 3 is set to "1" on a bit map in the information 30. When the optical disk 3 is loaded again after replacing the optical disk 3 by another disk, the corresponding information 30 corresponding to the identification information of the optical disk 3 is acquired. When a reading instruction to the optical disk 3 is outputted, the information 30 is referred to, and when the cache of the data whose reading is instructed is judged on the basis of the bit map, the cached data are read out from the HDD 4 instead of the optical disk 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a playback apparatus, a playback method, and a playback program that increase the access speed for data recorded on a removable recording medium.

  Conventionally, an imaging apparatus such as a video camera has been mainly an imaging apparatus that records AV (Audio Video) data such as video and audio on a recording medium such as a magnetic tape. In recent years, with the increase in recording capacity and access speed of optical discs, imaging devices using optical discs as recording media have appeared.

  In recent years, the processing speed of a computer device such as a personal computer has been improved, and an example in which AV data editing work or the like is performed on the computer device is increasing. When editing AV data shot by an imaging device using a magnetic tape as a recording medium using a computer device or the like, for example, a data format in which an OS (Operating System) can recognize AV data recorded on a magnetic tape It was necessary to edit the file after it was converted into a hard disk drive connected to the computer device and recognized as a file.

  On the other hand, when using an imaging device using an optical disc as a recording medium, for example, AV data obtained by imaging is recorded as a file on an optical disc formatted with a file system compatible with a computer device such as UDF (Universal Disc Format). Will do. According to this, the recorded AV data can be directly taken out as a file from the optical disk simply by loading the optical disk into the optical disk drive mounted on the computer apparatus.

  By the way, when editing AV data, searching for a target section from recorded AV data requires operations such as scrubbing, high-speed fast-forward, and fast-rewind while reproducing the AV data. When the above-described operation is performed on the AV data recorded on the optical disc, random seek occurs even if the AV data to be edited is recorded in a continuous area of the optical disc. At this time, since the optical disk drive has poor seek performance as compared with the hard disk drive, when a scrub operation, high-speed fast-forward, or fast-reverse is performed, fewer images are displayed per unit time. Therefore, detailed editing cannot be performed and a satisfactory operation feeling cannot be obtained.

  In order to solve this problem, AV data read from the optical disk is cached in, for example, a hard disk drive or a buffer memory, and when the data is read again, the data cached in the hard disk drive or the buffer memory is read. Yes. Patent Document 1 describes a technique for increasing the access speed to an optical disk using a cache as described above.

JP-A-9-35423

  However, in the conventional method, only data about the optical disk loaded in the optical disk drive immediately before is cached in the hard disk drive or buffer memory, and data previously cached when another optical disk is loaded in the optical disk drive. Was to be erased. Therefore, there is a problem that it is necessary to recache the data every time the optical disk is replaced.

  In particular, when data is read out by frequently replacing the optical disk, the previously cached data is erased each time the optical disk is replaced, so that the access speed to the optical disk cannot be increased.

  Therefore, an object of the present invention is to provide a playback device, a playback method, and a playback program that can read data from a detachable recording medium at high speed even when the recording medium is replaced. is there.

  In order to solve the above-described problem, the present invention provides a reproducing unit that reproduces data from a detachable first recording medium, and a first unit that reproduces data from the first recording medium by the reproducing unit. A recording unit for recording data reproduced from the recording medium on a second recording medium having a higher access speed than the first recording medium, identification information for identifying the first recording medium, and a reproducing unit A holding unit for holding association information in which information indicating a reproduction position of the reproduced data on the first recording medium and information indicating a recording position where the data is recorded on the second recording medium are associated; and a reproduction unit When the first recording medium is accessed, it is determined whether data corresponding to the access position is recorded on the second recording medium based on the association information, and the access position is determined based on the determination result. Data is second If it is determined to have been recorded in the recording medium, a reproducing apparatus, characterized in that it comprises a cache control unit for reading the data corresponding the second recording medium in the access position.

  Further, according to the present invention, when data is reproduced from the removable first recording medium, the data reproduced from the first recording medium is accessed at a second speed higher than that of the first recording medium. Identification information for identifying the first recording medium when recorded on the recording medium and accessed to the first recording medium, and data reproduced from the first recording medium on the first recording medium Whether or not the data corresponding to the access position is recorded on the second recording medium based on the association information that associates the information indicating the reproduction position with the information indicating the recording position at which the data is recorded on the second recording medium A reproduction method characterized in that if the data corresponding to the access position is recorded on the second recording medium based on the determination result, the data is read from the second recording medium. is there.

  Further, according to the present invention, when data is reproduced from the removable first recording medium, the data reproduced from the first recording medium is accessed at a second speed higher than that of the first recording medium. Identification information for identifying the first recording medium when recorded on the recording medium and accessed to the first recording medium, and data reproduced from the first recording medium on the first recording medium Whether or not the data corresponding to the access position is recorded on the second recording medium based on the association information that associates the information indicating the reproduction position with the information indicating the recording position at which the data is recorded on the second recording medium If it is determined that the data corresponding to the access position is recorded on the second recording medium based on the determination result, the computer apparatus is caused to execute a reproduction method in which the data is read from the second recording medium. A reproduction program characterized and.

  As described above, according to the present invention, when data is reproduced from the removable first recording medium, the access speed of the data reproduced from the first recording medium is higher than that of the first recording medium. Identification information for identifying the first recording medium when it is recorded on the second recording medium and accessed to the first recording medium, and the first recording of data reproduced from the first recording medium Data corresponding to the access position is recorded on the second recording medium based on the association information that associates the information indicating the reproduction position on the medium with the information indicating the recording position at which the data is recorded on the second recording medium. If the data corresponding to the access position is recorded on the second recording medium based on the determination result, the data is read from the second recording medium. The recording medium of Even when another first recording medium is loaded, if the data of the other first recording medium is recorded on the second recording medium, the access to the first recording medium is supported. Data to be read can be read from the second recording medium.

  As described above, according to the present invention, when data is reproduced from the first recording medium, the reproduced data is cached in the second recording medium having a higher access speed, and the first recording medium is stored in the first recording medium. Identification information for identification is associated as cache information together with position information in the first recording medium of data reproduced from the first recording medium and information indicating the recording position of the data in the second recording medium. Hold as. Then, when the first recording medium is loaded and accessed, the association information is referred to determine whether data corresponding to the access position is recorded on the second recording medium. If it is determined that the data corresponding to the access position is recorded on the second recording medium, the data is read from the second recording medium.

  Therefore, even when the first recording medium is replaced with another first recording medium, it is determined whether the data of the other first recording medium is recorded on the second recording medium based on the identification information. If the data of the other first recording medium is recorded on the second recording medium, the data is recorded on the other first recording medium recorded on the second recording medium. Data can be accessed. Thereby, even when the detachable first recording medium is used interchangeably, the access to each of the first recording media can be apparently increased in speed.

  Hereinafter, an embodiment of the present invention will be described. According to the present invention, data read from a detachable first recording medium is recorded on a second recording medium having a higher access speed to the data than the first recording medium, and is recorded on the second recording medium. The recorded data is managed in association with identification information unique to each first recording medium. Based on the identification information of the loaded first recording medium, the corresponding data recorded on the second recording medium can be read, and even when the first recording medium is used after being exchanged, The access to each recording medium can be apparently speeded up.

  In the following, “data read from a first recording medium having a relatively low access speed is recorded on a second recording medium having an access speed higher than that of the first recording medium, and the first recording medium is recorded. "Access the corresponding data recorded on the second recording medium when accessing the data" is described as "cache".

  FIG. 1 shows an example of use of an embodiment of the present invention. The computer apparatus 1 is equipped with an application for editing audio data and video data (hereinafter abbreviated as AV (Audio Video) data), for example, and uses the optical disk drive 2 to record AV data recorded on the optical disk 3. It functions as an editing device or playback device that reads out and edits.

  In the present invention, when the computer apparatus 1 accesses the optical disk 3, AV data reproduced from the optical disk 3 is supplied to the computer apparatus 1 and cached in the hard disk drive 4. At this time, the computer apparatus 1 identifies identification information for identifying the optical disc 3, position information indicating the position on the optical disc 3 of data reproduced from the optical disc 3, and the hard disc drive 4 of data reproduced from the optical disc 3. Information indicating the recording position is stored in association with each other as a cache information table.

  Then, for example, when the optical disk 3 is next loaded in the optical disk drive 2, the cache information table is referred to based on the identification information of the loaded optical disk 3, and data accessed for the optical disk 3 is recorded in the hard disk drive 4. It is judged whether it is done. If it is determined that the data is recorded, the data is read from the hard disk drive 4 without accessing the optical disk 3. On the other hand, if it is determined that the data accessed to the optical disk 3 is not recorded on the hard disk drive 4, the data is read from the optical disk 3 and recorded on the hard disk drive 4, and cached based on the information about the recorded data. Update the information table.

  In this way, when the optical disk 3 is loaded into the optical disk drive 2, it can be determined whether or not the hard disk drive 4 is a disk having cache data based on the identification information. Therefore, if the optical disk 3 has been cached in the hard disk drive 4, the data cached in the hard disk drive 4 can be used even after the disk is replaced and another disk is played back. The access speed to 3 can be apparently increased.

  Note that the recording capacity of the hard disk drive 4 is preferably sufficiently larger than that of the optical disk 3 and needs to be at least twice the recording capacity of the optical disk 3. Further, the access speed of the hard disk drive 4 needs to be sufficiently higher than the access speed of the optical disk 3.

  FIG. 2 shows an exemplary configuration of the computer apparatus 1. Here, only the portion of the computer apparatus 1 that is closely related to the embodiment of the present invention is shown, and the description of other portions is omitted to avoid complication.

  The computer apparatus 1 includes, for example, a CPU (Central Processing Unit) 11, a memory controller 12, an I / O (Input / Output) controller 13, and a memory 14. Further, an optical disk drive 2 and a hard disk drive 4 are connected to the computer device 1.

  The optical disk drive 2 and the hard disk drive 4 may be externally connected to the computer apparatus 1 or may be built in the computer apparatus 1. In the following description, the optical disk drive 2 and the hard disk drive 4 will be described as being externally connected to the computer apparatus 1.

  As an interface for connecting the optical disk drive 2 and the hard disk drive 4 to the computer apparatus 1, for example, an ATA (AT Attachment) interface can be used. Of course, another interface can be used as an interface for connecting the optical disk drive 2 and the hard disk drive 4 to the computer apparatus 1.

  The CPU 11 performs control of each part of the computer device 1 and access control of the optical disk drive 2 and the hard disk drive 4 using the memory 14 as a work memory according to the program. For example, the program is recorded in advance in a ROM (Read Only Memory) (not shown) or a hard disk drive (not shown) separately connected to the I / O controller 13. Further, the program may be recorded in the hard disk drive 4.

  The CPU 11 cannot directly exchange data and commands with the optical disk drive 2 and the hard disk drive 4. The exchange between the CPU 11 and these optical disk drive 2 and hard disk drive 4 is performed via the I / O controller 12. For example, a read request or a write request from the CPU 11 to the optical disk drive 2 or the hard disk drive 4 is supplied to the disk drive 2 or the hard disk drive 4 via the memory controller 12 and the I / O controller 13.

  Data supplied to the optical disk drive 2 for writing to the optical disk 3 and data to be written to the hard disk drive 4 are temporarily stored in the memory 14. The data written in the memory 14 is read from the memory 14 in a predetermined recording unit corresponding to a recording medium such as a sector unit, and is sent to the optical disk drive 2 and the hard disk drive 4 via the memory controller 12 and the I / O controller 13. Supplied.

  Further, in response to a read request from the CPU 11, data is read from the optical disk 3 or the hard disk drive 4 in a predetermined recording unit (sector unit or the like) corresponding to the recording medium, via the I / O controller 13 and the memory controller 12. And stored in the memory 14. The CPU 11 reads the data stored in the memory 14 and performs a predetermined process.

  The optical disk drive 2 reads and writes data from and to the optical disk 3 based on instructions from the CPU 11. Here, the CPU 11 can read the identification information of the optical disc 3 recorded in a predetermined area of the optical disc 3 by the optical disc drive 2. The identification information of the optical disc 3 will be described later.

  As a recording format of the optical disc 3, for example, UDF (Universal Disk Format) can be used. The UDF has a recording capacity per sector, which is the minimum access unit, of 2048 bytes. When UDF is used as a recording format, the optical disk drive 2 performs data writing to the optical disk 3 and data reading from the optical disk 3 in units of sectors, that is, 2048 bytes, for example.

  Next, read processing according to an embodiment of the present invention will be schematically described. When it is determined that the optical disk 3 loaded in the optical disk drive 2 is a disk from which data is read for the first time based on the identification information, the computer apparatus 1 caches the data read from the optical disk 3 in the hard disk drive 4, Information relating to the optical disc 3 and data are associated with each other, and are created and held as cache information.

  Further, the computer apparatus 1 has previously read data from the optical disk 3 loaded in the optical disk drive 2 based on the identification information, and the data to be read from the optical disk 3 has been previously read. If it is determined that the data has been read, the data cached in the hard disk drive 4 is read based on the cache information corresponding to the optical disc 3. Further, when data that has not been read from the optical disk 3 is newly read, the read data is cached in the hard disk drive 4 and the cache information is updated.

  The recording or storage medium for storing the cache information is not particularly limited as long as it is nonvolatile. For example, cache information can be recorded in the hard disk drive 4. However, the present invention is not limited to this, and the cache information may be recorded on another nonvolatile recording medium. For example, the cache information can be recorded or stored in another hard disk drive connected via the I / O controller 13 or a nonvolatile semiconductor memory. Further, it may be possible to record on a removable recording medium such as an optical disk.

  The cache information will be described more specifically. The cache information is information indicating the relationship between each of the optical disks 3 loaded in the past and the data cached in the hard disk drive 4. FIG. 3 shows an example of the cache information 30 created by the CPU 11. In the example of FIG. 3, the cache information 30 includes an item “media ID (IDentification)”, an item “cache file name”, an item “time stamp”, and an item “bitmap”.

  The item “media ID” stores unique identification information assigned to each optical disc 3. As the media ID, a production number recorded on the physical layer when the optical disc 3 is produced can be used. For example, when the optical disc 3 is a PD (Professional Disc: registered trademark) or a recordable DVD (Digital Versatile Disc), a production number recorded in a BCA (Burst Cutting Area) at the time of production can be used.

  As the identification information, when the disc format of the optical disc 3 is UDF, an identifier of “Volume Identifier” in PVD (Primary Volume Descriptor) defined in UDF can be used. Furthermore, an ID that is unique throughout the world, such as UMID (Unique Material IDentifier), can be described in a metafile for describing disk information, and this UMID can be used as identification information.

  Note that these pieces of information that can be used as identification information of the optical disc 3 are information in advance of the recording location on the optical disc on the application or file system side that handles the optical disc. For example, such identification information is recorded on the inner periphery side of the recording area of the optical disc 3 or is recorded with a predetermined file name for the recording area of the optical disc 3.

  The information that can be used as the identification information is unique for each optical disc 3, and other information can be used as long as the recording position and format are known in the application or file system that handles the optical disc 3.

  The item “cache file name” stores the file name and path of data cached in the hard disk drive 4. That is, in this embodiment, an area corresponding to the recording area of the optical disk 3 is secured as a file in the hard disk drive 4 for each of the optical disks 3. This file name and path are stored in the item “cache file name”.

  The item “time stamp” stores the last update date and time of the optical disc 3. The time stamp is, for example, the update date / time of the last updated file, and is based on the last update date / time information described in the management information of the optical disc 3.

  The item “bitmap” stores information indicating whether or not the data of the optical disc 3 has been read for each recording unit (eg, sector) of the optical disc 3. That is, a flag indicating whether data has been read is set for each recording unit of the optical disc 3. The flag is, for example, 1-bit information, and indicates that the data of the recording unit has been read with the value “1”, and indicates that the data of the recording unit has not been read with the value “0”. Flags of all sectors in the recording area of the optical disc 3 are stored in the item “bit map”.

  In FIG. 3, the cache information 30 is shown as individual data for each media ID. However, this is not limited to this example, and one table (cache information table and the cache information 30 shown in FIG. 3 is collected). Can be configured). Each piece of cache information in the cache information table is managed by a media ID. For example, each item described in the cache information 30 may be managed as a structure. As an example, the contents of the item “bitmap” are not directly described in the cache information 30, but the bitmap information is stored as a separate file, and the cache information 30 includes only pointer information indicating an access method to the file. May be described.

  Next, an example of cache control according to an embodiment of the present invention will be described with reference to the flowchart shown in FIG. Each process shown in the flowchart of FIG. 4 is executed by the CPU 11 based on a program. In the following description, it is assumed that the recording area of the optical disc 3 is managed in units of sectors, and a sector number is designated to instruct data reading.

  When the optical disk 3 is loaded into the optical disk drive 2 (step S1), the CPU 11 acquires identification information of the loaded optical disk 3 (step S2). In step S3, it is determined whether or not the cache information 30 corresponding to the acquired identification information exists. If it is determined that there is cache information 30 corresponding to the acquired identification information, the process proceeds to step S 4, and the cache information 30 is read and held in the memory 14.

  On the other hand, if it is determined in step S3 that the corresponding cache information 30 does not exist, the process proceeds to step S5, and the cache information 30 corresponding to the identification information acquired in step S2 is newly created. For example, when the optical disk 3 is loaded into the computer device 1 for the first time, there is no cache information 30 corresponding to the acquired identification information. In such a case, cache information 30 is newly created. The created cache information 30 is held in the memory 14 in step S4. At the time when the cache information 30 is created, the value of each flag in the item “bit map” of the cache information 30 is set to a value “0” indicating that the corresponding sector has not been read yet.

  When the cache information 30 is newly created, a file having a capacity corresponding to the entire recording area of the optical disk 3 on which the cache information 30 is created is secured on the hard disk drive 4. As an example, when the optical disk 3 has a recording capacity of 23 GB (Giga Byte), a file with a data size of 23 GB is created on the hard disk drive 4.

  In the next step S6, it is determined whether reading of data from the optical disk 3 whose media ID has been acquired in the above-described step S2 is instructed, or whether the optical disk 3 is instructed to be ejected from the optical disk drive 2.

  If it is determined that the optical disk 3 is instructed to be ejected from the optical disk drive 2, the process proceeds to step S11, and the cache information 30 held in the memory 14 is deleted from the memory 14 in step S4. Then, the process returns to step S1 to enter a standby state for loading the optical disk 3 into the optical disk drive 2.

  On the other hand, if it is determined in step S6 that an instruction to read data from the optical disc 3 has been issued, the process proceeds to step S7. In step S 7, the cache information 30 held in the memory 14 is referred to, and it is determined whether or not the data instructed to be read is cached in the hard disk drive 4.

  That is, in step S7, data on the bitmap corresponding to the position on the optical disk 3 of the data to be read is searched based on the cache information 30, and it is determined whether or not the data has been read from that position. If the data has been read, the data at that position is cached in the hard disk drive 4.

  As an example, when reading of data from the optical disk 3 is instructed, the file system acquires a sector number of the data to be read on the optical disk 3 based on the data reading instruction. Then, the flag corresponding to the sector number acquired based on the item “bitmap” of the cache information 30 is referred to. If the value of the flag is “1”, it is determined that the sector of the sector number has been read and the data corresponding to the sector number is cached in the hard disk drive 4.

  If it is determined in step S 7 that the data instructed to be read is cached in the hard disk drive 4, the process proceeds to step S 8, and the data is read from the hard disk drive 4. The read data is written into the memory 14 via, for example, the I / O controller 13 and the memory controller 12 and processed by the CPU 11 in a predetermined manner. When the data is read, the process returns to step S6.

  On the other hand, if it is determined in step S7 that the data instructed to be read is not cached in the hard disk drive 4, the process proceeds to step S9. In step S9, the data instructed to read is read from the optical disc 3. The read data is written into the memory 14 via, for example, the I / O controller 13 and the memory controller 12, and is processed in a predetermined manner by the CPU 11, and secured in advance for the optical disc 3 of the hard disk drive 4. Cached in the cache area.

  In the next step S10, the flag corresponding to the position on the optical disk of the data read from the optical disk 3 in the item “bitmap” in the cache information 30 indicates that the data has been cached (this example Then, “1”).

  That is, when one sector of data is read from the optical disc 3, the sector number of the sector from which the data has been read is acquired and read to a position in the cache area of the hard disk drive 4 corresponding to the sector number. Data is cached. At the same time, in the bitmap secured in the item “bitmap” of the cache information 30, the value of the flag corresponding to the acquired sector number is set to “1”.

  When the data of the item “bitmap” of the cache information 30 is updated in step S10, the process returns to step S6. The series of processing from step S6 to step S8 or step S10 described above is repeated in units of sectors until reading of designated data is completed.

  When the cache information 30 held in the memory 14 is updated, the updated contents are reflected on the cache information 30 stored in the hard disk drive 4 at a predetermined timing. For example, if it is determined in step S6 described above that an instruction to eject the optical disk 3 has been issued, the cache information 30 stored in the memory 14 is overwritten on the cache information 30 stored in the hard disk drive 4.

  FIG. 5 shows an example of the relationship between the data on the optical disc 3 and the cache information 30. Here, in order to simplify the explanation, it is assumed that the cache information 30 and the cached data are both recorded in the hard disk drive 4.

  In the cache information 30, the item “media ID” stores identification information read from a predetermined area 35 on the optical disc 3. Further, the last update date / time of the optical disc 3 is acquired based on the file management information 36 recorded on the optical disc 3 and stored in the item “time stamp” of the cache information 30. For the optical disc 3 having the identification information 30 corresponding to the identification information stored in the item “media ID” of the cache information 30, the file on the optical disc 3 is more than the information described in the item “time stamp” in the cache information 30. When the last update date and time described in the management information 36 indicates a new date and time, it can be seen that the optical disc 3 has been rewritten by another system.

  As described above, in order to cache the data read from the optical disk 3 in the hard disk drive 4, the maximum recording capacity information indicating the maximum recording capacity of the optical disk 3 is acquired from the file management information recorded on the optical disk 3, and acquired. Based on the recorded maximum recording capacity information, a cache area 31 having the same capacity as the maximum recording capacity of the optical disc 3 is secured as a file on the hard disk drive 4. The file name and path of the secured cache area are described in the item “cache file name” of the cache information 30.

  The cache area 31 is preferably secured in an area where addresses on the hard disk drive 4 are continuous. However, the present invention is not limited thereto, and the cache area 31 may be secured on the hard disk drive 4 discontinuously in terms of address.

  On the other hand, the item “bit map” in the cache information 30 manages data on the optical disc 3 by using, for example, a sector unit using a 1-bit flag. In the item “bit map”, 1 bit indicates the cache status of the hard disk drive 4 for one sector of data on the optical disc 3. The location where the data on the optical disk 3 is cached on the hard disk drive 4 can be traced from the item “cache file name” and the item “bitmap” of the cache information 30. For example, when the sector length of the optical disk 3 is 2048 bytes and the sector corresponding to the 100th bit counting from the head of the bitmap is to be accessed, “(start address of the file described in the cache file name) +2048 It is only necessary to access a pointer of (byte) × 100 ”.

  FIG. 6 shows an example of processing when the optical disk 3 that has not been reproduced by the system for the first time is reproduced. When the optical disk 3 is loaded into the optical disk drive 2, the CPU 11 (not shown) acquires the identification information of the loaded optical disk 3, and reads the cache information 30 corresponding to the acquired identification information from the hard disk drive 4, for example. Trying out (SEQ10). In this case, since the optical disk 3 is a disk that has not been reproduced by the system in the past, the cache information 30 corresponding to the identification information does not exist on the hard disk drive 4.

  When the user instructs the optical disk 3 to read data (SEQ11), the CPU 11 acquires data read from the optical disk 3 in response to the read instruction (SEQ12) and stores the data in the hard disk drive 4 Is cached in a predetermined cache area 31 (SEQ13). In addition, cache information 30 is newly created (SEQ14). Actually, the new cache area 31 is secured together with the new creation of the cache information 30. Management of data read from the optical disc 3 and cached in the cache area 31 is performed in units of sectors (2048 bytes) of the optical disc 3, for example.

  FIG. 7 shows an example of processing when data is read once by the system. When the optical disk 3 is loaded into the optical disk drive 2, the CPU 11 acquires identification information of the loaded optical disk (SEQ20), and reads the cache information 30 corresponding to the acquired identification information from, for example, the hard disk drive 4 (SEQ21). . In this case, since the sector that has been read once is accessed, the flag on the bitmap corresponding to the sector instructed to read is a value “1” indicating that the sector has been read. Yes. Based on this bitmap, the corresponding data in the cache area 31 on the hard disk drive 4 can be traced. Corresponding data is read from the cache area 31 (SEQ22).

  As described above, even if it appears to the user that the optical disk 3 is being accessed, the hard disk drive 4 having a higher access speed is actually accessed and data is read out. Therefore, the reading from the optical disc 3 is apparently speeded up.

  The embodiment of the present invention can also be applied to the rewritable optical disc 3. When the rewritable optical disk 3 is used, the data recorded on the optical disk 3 may be updated after the cache information 30 is created. In this case, the data cached in the cache information 30 and the cache area 31 and the information actually recorded on the optical disc 3 are different. For this reason, when data is read from the optical disc 3 and the data cached in the cache area 31 of the hard disk drive 4 is read based on the cache information 30, the interval between the data instructed to be reproduced and the actually read data is obtained. May cause inconsistencies.

  Therefore, when the optical disc 3 is loaded into the optical disc drive 2, the latest update date / time information is acquired from the file management information 36 recorded on the optical disc 3. Then, the last update date and time indicated by the last update date and time information obtained from the optical disc 3 and the item “time stamp” of the cache information 30 corresponding to the identification information of the loaded optical disc 3 when the optical disc 3 is loaded are described. Compare the last updated date and time. If the last update date / time information acquired from the optical disc 3 is newer than the last update date / time described in the item “time stamp” of the cache information 30, the data recorded on the optical disc 3 is updated by another device. Can be judged.

  Here, as described above, the last update date and time indicated by the item “time stamp” of the cache information 30 is the last update date and time for the entire optical disc 3, and it cannot be specified which data has been updated. Therefore, if the last update date / time of the loaded optical disc 3 and the last update date / time based on the cache information 30 are different, all the data cached from the optical disc 3 is deleted from the hard disk drive 4. At the same time, all the flags in the bitmap stored in the item “bitmap” of the cache information 30 corresponding to the optical disc 3 are initialized to the value “0”, and the value of the item “time stamp” is newly obtained. Update to the value of the last update date. After that, the data read from the optical disk 3 is cached in the hard disk drive 4, and the value of the flag corresponding to the position where the data is read from the optical disk 3 in the item “bitmap” of the cache information 30 is set. “1”.

  In the above description, the data cached from the optical disk 3 to the hard disk drive 4 is managed in units of the optical disk 3. However, this is not limited to this example, and for example, the cache can be managed in units of files on the optical disk 3. . By managing the cache in units of files, when a certain file on the optical disk 3 is updated by another device, only the corresponding file portion of the cache data on the hard disk drive 4 is deleted, and the other is not updated. Since the portion corresponding to the file can be left, caching can be performed efficiently.

  More specifically, the fan information management information 36 of the optical disc 3 manages file information recorded on the optical disc 3 for each file. This file information includes information indicating the update date and time of the file. Information identifying the file, such as a file name, is added as an item of the cache information 30, and the item “time stamp” is managed for each file, and the position on the bitmap indicated by the item “bitmap”, the optical disc 3 Associate with the above file location.

  The data cached in the hard disk drive 4 can only be read. Not limited to this, cached data can be rewritten. In this case, for example, when the optical disk 3 corresponding to the cached data is loaded into the optical disk drive 2, the last update date / time information of the optical disk 3 and the update date / time information of the data cached from the optical disk 3 to the hard disk drive 4 are stored. If the update date / time information of the data cached in the hard disk drive 4 is newer, the corresponding data on the optical disk 3 may be updated with the cached data.

  Next, a method for realizing the cache control according to the embodiment of the present invention as described in FIG. 4 will be described. In the following, a Windows (registered trademark) system by US Microsoft Corporation is installed as the OS (Operating System) of the computer apparatus 1, and cache control according to an embodiment of the present invention is performed based on this Windows system. And

  First, prior to the description of the cache control method according to the embodiment of the present invention, read control of storage devices such as the optical disk drive 2 and the hard disk drive 4 in the Windows system will be schematically described with reference to FIGS. To do.

  In the Windows system, software operations include a kernel mode in which instructions using all hardware of the computer device 1 can be executed, and a user mode in which executable instructions are limited. The OS operates in the kernel mode, and the internal operation of the OS can be changed in the kernel mode. On the other hand, the user mode is under the jurisdiction of the OS, and a user program (for example, an application) operates. In the user mode, it is impossible to execute other user programs or instructions that may hinder the execution of the OS.

  As shown in FIG. 8, the application 21 that operates in the user mode, for example, an optical disk drive 2 or the like that is hardware via an I / O (Input / Output) manager 22 and a driver 23 that operate in the kernel mode. A storage device 24 such as a hard disk drive 4 is used. When the I / O manager 22 receives a read command or a write command for the storage device 24 from the application 21, these received commands are converted into an IRP (I / O Request Packet) for performing the corresponding read and write. Convert and pass to the driver 23. The driver 23 controls the storage device 24 as hardware according to the received IRP, and writes data to the storage device 24 and reads data from the storage device 24.

  The IRP is a packet in which an input / output request is stored, and is an I / O processing unit between drivers. The IRP is a driver including a header including information common to the driver 23 such as request type, size, synchronous / asynchronous, buffer pointer, and status, function code, function-specific parameters, and a pointer to a file object to be read. 23, and a stack location including information unique to it.

  On the other hand, as shown in FIG. 9, for example, a filter driver 25 that can change the operation of the driver 23 can be added to the above-described configuration. The filter driver 25 operates in the kernel mode. In the example of FIG. 9, the filter driver 25 operates by interrupting between the I / O manager 22 and the driver 23, and before the driver 23 receives the original IRP passed from the I / O manager 22 to the driver 23. The changed IRP is passed to the driver 23. This makes it possible to add new functions and change the operation of the driver 23.

With respect to the read control in the Windows system as described above, the following three methods are conceivable as a method for realizing the cache control according to the embodiment of the present invention.
(1) Method of performing cache control with application 21 (2) Method of performing cache control with filter driver 25 (3) Method of performing cache control with driver 23 controlling optical disk drive 2

  An example of the method (1) of performing cache control by the application 21 will be described with reference to FIG. In this case, the application 21 is software that performs a predetermined process using, for example, data read from the optical disc 3. As an example, video editing software that reads and edits video data from the optical disc 3 corresponds to the application 21 in this case.

  When the optical disc 3 is loaded in the optical disc drive 2, the identification information of the optical disc 3 is acquired by, for example, the I / O manager 22. The application 21 receives the identification information acquired from the I / O manager 22, refers to the cache information table of the hard disk drive 4 based on the received identification information, and determines whether or not the cache information 30 corresponding to the identification information exists. Judgment is made (step S3 in FIG. 4). Thereafter, the processing after step S3 described with reference to the flowchart of FIG. 4 is executed in the application 21, and cache control is performed.

  That is, to explain with reference to FIG. 4, when the cache information 30 exists, the cache information 30 is read from the hard disk drive 4 and held in the memory 14 (step S4). When reading from the optical disk 3, the application 21 determines whether the read data is cached in the hard disk drive 4 based on the item “bitmap” of the cache information 30 (step S 7). If determined, the data is read from the cache area 31 of the hard disk drive 4 (step S8).

  On the other hand, if it is determined in step S7 that the data is not cached, a read request is issued to the I / O manager 22 so as to read the data from the optical disc 3, and the I / O manager 22 receives the IRP based on the read request. Is generated and passed to the driver 23. The driver 23 reads the data from the optical disc 3 by controlling the optical disc drive 2 based on the passed IRP. The read data is transferred from the driver 23 to the application 21 via the I / O manager 22. The application 21 caches the received data in the cache area 31 of the hard disk drive 4 (step S9), and at the same time, the data is read from the optical disc 3 for the bitmap in the item “bitmap” of the cache information 30. The bit corresponding to the determined position is set to “1” (step S10).

  In step S7, the application 21 needs to know the position of the data to be read on the optical disc 3, but this may be inquired from the application 21 to the OS each time, or on the application 21 side. The position information on the optical disc 3 may be managed.

  The method (2) of performing the cache control by the filter driver 25 will be described with reference to FIG. In this case, the processing after step S3 in the flowchart of FIG. 4 is performed on the filter driver 25.

  When the optical disk 3 is loaded into the optical disk drive 2, the identification information of the optical disk 3 is acquired by, for example, the I / O manager 22. When there is a read request from the application 21, the I / O manager 22 generates an IRP in response to the read request and places the identification information of the optical disc 3 on the IRP. The I / O manager 22 passes this IRP to the driver 23.

  The IRP passed from the I / O manager 22 to the driver 23 is acquired by the filter driver 25 before being received by the driver 23. When obtaining the IRP, the filter driver 25 refers to the cache information table of the hard disk drive 4 based on the identification information included in the IRP, and determines whether or not the cache information 30 corresponding to the identification information exists (FIG. 4). Step S3). Thereafter, the processing after step S3 described using the flowchart of FIG. 4 is executed in the filter driver 25, and cache control is performed.

  Referring to FIG. 4, when the cache information 30 exists, the filter driver 25 reads the cache information 30 from the hard disk drive 4 and stores it in the memory 14 (step S4). Based on the IRP received from the I / O manager 22 and the cache information 30, the filter driver 25 determines to which of the optical disk drive 2 and the hard disk drive 4 the IRP received from the I / O manager 22 is to be passed.

  That is, the filter driver 25 refers to the item “bitmap” of the cache information 30 based on the IRP received from the I / O manager 22 and determines whether the read data is cached in the cache area 31 of the hard disk drive 4. (Step S7).

  When it is determined that the cache is cached, the filter driver 25 changes the destination of the IRP received from the I / O manager 22 from the optical disk drive 2 to the hard disk drive 4, and passes the changed IRP to the hard disk drive 4. The hard disk drive 4 reads data from the cache area 31 on the basis of the received IRP (step S8).

  On the other hand, if it is determined in step S7 that the data is not cached, the filter driver 25 passes the IRP received from the I / O manager 22 to the driver 23. The driver 23 reads the data from the optical disc 3 by controlling the optical disc drive 2 based on the passed IRP. The read data is passed from the driver 23 to the application 21 via the filter driver 25 and the I / O manager 22. Further, the filter driver 25 caches the data read from the optical disk 3 passed from the driver 23 in the cache area 31 of the hard disk drive 4 in a predetermined manner (step S9) and the item “bitmap” of the cache information 30. The bit corresponding to the position where the data is read from the optical disc 3 is set to “1” (step S10).

  In the method of performing cache control using the filter driver 25 of (2), the existing application 21 and driver 23 can be used as they are. That is, the application 21 simply passes a read request of the optical disc 3 to the I / O manager 22, and the driver 23 controls the optical disc drive 2 according to the IRP passed from the filter driver 25, and Can be read.

  A method of performing cache control by the driver 23 in (3) will be described with reference to FIG. In this case, the function of the filter driver 25 described in the above-described method (2) of performing the cache control using the filter driver 25 is implemented in the driver 23. In other words, the processing after step S3 in the flowchart of FIG.

  When the optical disk 3 is loaded into the optical disk drive 2, the identification information of the optical disk 3 is acquired by, for example, the I / O manager 22. When there is a read request from the application 21, the I / O manager 22 generates an IRP in response to the read request and places the identification information of the optical disc 3 on the IRP. The I / O manager 22 passes this IRP to the driver 23.

  Upon receiving the IRP, the driver 23 refers to the cache information table of the hard disk drive 4 based on the identification information included in the IRP, and determines whether or not the cache information 30 corresponding to the identification information exists (FIG. 4). Step S3). Thereafter, the processing after step S3 described with reference to the flowchart of FIG. 4 is executed by the driver 23, and cache control is performed.

  Referring to FIG. 4, when the cache information 30 exists, the filter driver 23 reads the cache information 30 from the hard disk drive 4 and stores it in the memory 14 (step S4). Based on the IRP received from the I / O manager 22 and the cache information 30, the driver 23 performs read control based on the IRP received from the I / O manager 22 to which of the optical disk drive 2 and the hard disk drive 4. Judging.

  That is, the driver 23 refers to the item “bitmap” of the cache information 30 based on the IRP received from the I / O manager 22 and determines whether or not the read data is cached in the cache area 31 of the hard disk drive 4. (Step S7).

  If it is determined that the data is cached, the driver 23 performs read control on the hard disk drive 4 and reads data from the cache area 31 in a predetermined manner (step S8).

  On the other hand, if it is determined in step S7 that the data is not cached, the driver 23 performs read control on the optical disk drive 2 and reads data from the optical disk 3. The read data is transferred from the driver 23 to the application 21 via the I / O manager 22. Further, the driver 23 caches the data read from the optical disc 3 in the cache area 31 of the hard disk drive 4 in a predetermined manner (step S9), and applies the optical disc to the bitmap in the item “bit map” of the cache information 30. The bit corresponding to the position where the data is read from 3 is set to “1” (step S10).

  In the above description, the cache control method according to the embodiment of the present invention has been described with respect to the method for realizing with the application 21, the method for realizing with the filter driver 25, and the method for realizing with the driver 23. It is not limited to. For example, the functions of the cache control method according to the embodiment of the present invention can be shared by the application 21, the filter driver 25, and the driver 23, and the respective operations can be combined and realized.

  Next, an application example of one embodiment of the present invention will be described. As described above, according to the embodiment of the present invention, the cache area 31 is secured for the hard disk drive 4 corresponding to the recording area of the optical disk 3. The cache area 31 is managed for each optical disc 3 by the item “media ID” of the cache information 30. When accessing the optical disk 3, the user caches data and reads the cached data without being particularly conscious of the user. Therefore, the embodiment of the present invention can be applied to a virtual medium changer.

  That is, the cache area 31 corresponding to the identification information described in the item “media ID” of the cache information 30 is regarded as the virtual optical disk 3 corresponding to the identification information. Then, by making a read request to the virtual optical disc 3, it is possible to read the data on the optical disc 3 that has been cached in the corresponding cache area 31. Therefore, even if the optical disk 3 is not actually loaded in the optical disk drive 2, the same data recorded on the optical disk 3 can be acquired as long as it is cached in the cache area 31.

  FIG. 13A shows an example of a GUI (Graphical User Interface) when using a virtual medium changer (hereinafter referred to as a virtual changer). In the example of FIG. 13A, a virtual changer 41 is displayed on a file browsing operation screen 40 of so-called file operation software that performs operations on various files and folders on the computer device 1. For the virtual changer 41, virtual disks 42A, 42B, 42C,... That are currently virtually loaded in the virtual changer 41 are indicated by icons. The virtual changer 41 can play back the virtual disks 42A, 42B, 42C,. For example, the virtual disk 42A is reproduced by designating a predetermined icon of the virtual disk 42A.

  The virtual disks 42A, 42B, 42C,... Are actually cache areas on the hard disk drive 4 respectively corresponding to the cache information 30A, 30B, 30C,... As shown in FIG. 31A, 31B, 31C,. In other words, for example, the cache area 31A in which an area corresponding to the recording area of a certain optical disk 3 is secured on the hard disk drive 4 is the virtual disk 42A corresponding to the optical disk 3, and the access method and attributes for the virtual disk 42A. Information or the like is indicated by the cache area 31A and the cache information 30A corresponding to the optical disc 3.

  As described above, the cache of the data reproduced from the optical disc 3 in the cache area 31 is cached every predetermined unit, for example, every sector unit which is a recording unit of the optical disc 3. Therefore, the cache area 31 of the hard disk drive 4 includes an already cached portion where the data of the optical disk 3 is cached and an uncached portion which is not cached. Therefore, in the corresponding virtual drives 42A, 42B, 42C,..., As shown in an example in FIG. In the example of FIG. 14A, in each of the virtual disks 42A and 42B, the data of the corresponding optical disk 3 is not cached except for the portion indicated by the oblique lines.

  In this way, when playing back a virtual disk in which the already cached part and the uncached part are mixed, as shown in FIG. 14B, the uncached part is skipped and the already cached part is connected and played continuously. It is possible to do. This is suitable for use when the data of the optical disc 3 on which AV data is recorded is cached.

  However, the present invention is not limited to this. For example, when playing a virtual disk with an uncached part, a request is made to load the optical disk 3 corresponding to the optical disk drive 2, and data is read from the optical disk 3 when playing the uncached part The data may be reproduced continuously.

  Further, the user can visually know which part of the corresponding optical disk 3 is cached by displaying the properties in the virtual disks 42A, 42B, 42C,. For example, the cached portion of the corresponding optical disk 3 can be indicated based on the item “bitmap” of the cache information 30A corresponding to the virtual disk 42 for which the property display is designated. At this time, for example, it is preferable to display the pie chart by simulating the actual shape of the optical disc 3 because the cache portion can be intuitively understood.

  In order to realize the virtual changer 41 according to this application example, among the three cache control implementation methods described above, either the method of performing cache control with the filter driver 25 of (2) or the method of (3) Use of any of the methods for performing cache control by the driver 23 is preferable because the virtual changer 41 can be recognized at the OS level. In the case of using the method (1) of performing cache control by the application 21, for example, it is conceivable to manage or operate the virtual changer 41 using a dedicated GUI.

  In the above description, the unit when the data on the optical disk 3 is cached in the hard disk drive 4 is the recording unit of the optical disk 3 such as the sector unit, but this is not limited to this example. For example, when the data to be cached is limited to AV data, the cache unit may be a AV data delimiter unit such as a frame unit or GOP (Group Of Picture).

  The present invention is not limited to the above-described embodiment of the present invention, and various modifications and applications can be made without departing from the gist of the present invention. For example, in the above description, the example in which the hard disk drive is used as the recording medium for caching the cache information and the data read from the optical disk 3 has been described. A semiconductor memory or a recordable optical disk having an access speed higher than that of the optical disk 3 may be used.

  Further, in the above description, the example in which the cache control according to the present invention is applied to the Windows system has been described. However, this is not limited to this example, and the cache control method according to the present invention is applied to other OSs. Can do.

It is a basic diagram which shows the usage example of one Embodiment of this invention. 2 is a block diagram showing an example of the configuration of a computer apparatus 1. FIG. It is a basic diagram which shows an example of cache information. It is a flowchart which shows an example cache control by one Embodiment of this invention. It is a basic diagram which shows the example of the relationship between the data on an optical disk, and cache information. It is a basic diagram which shows an example process at the time of reproducing | regenerating for the first time the optical disk which the system has not reproduced | regenerated in the past. An example of processing when data is read once by the system will be described. It is an approximate line figure explaining roughly reading control of an example storage device in a Windows system. It is an approximate line figure explaining roughly reading control of an example storage device in a Windows system. It is a basic diagram for demonstrating the method of an example which performs cache control with an application. It is a basic diagram for demonstrating the method of an example which performs cache control with a filter driver. It is a basic diagram for demonstrating the method of an example which performs cache control by a driver. It is a basic diagram for demonstrating an example of a virtual medium changer. It is a basic diagram for demonstrating the reproducing method of an example of a virtual disk.

Explanation of symbols

1 Computer Device 2 Optical Disk Drive 3 Optical Disk 4 Hard Disk Drive 11 CPU
12 Memory Controller 13 I / O Controller 14 Memory 21 Application 22 I / O Manager 23 Driver 25 Filter Driver 30 Cache Information 31 Cache Area

Claims (17)

A reproducing unit for reproducing data from a detachable first recording medium;
When the data is reproduced from the first recording medium by the reproducing unit, the data reproduced from the first recording medium is accessed at a speed higher than that of the first recording medium. A recording section for recording on
Identification information for identifying the first recording medium, information indicating a reproduction position on the first recording medium of the data reproduced by the reproducing unit, and the data on the second recording medium A holding unit that holds association information in association with information indicating the recorded recording position;
When the reproducing unit accesses the first recording medium, it is determined whether or not data corresponding to the access position is recorded on the second recording medium based on the association information, and a determination result And a cache control unit that reads data corresponding to the access position from the second recording medium when it is determined that the data corresponding to the access position is recorded on the second recording medium. A playback device. The playback device according to claim 1,
The cache control unit
When the reproducing unit accesses the first recording medium, the identification information of the first recording medium is compared with the identification information described in the association information, and the identification information of the first recording medium is compared. When the first recording medium is accessed by referring to the information indicating the reproduction position corresponding to the identification information based on the association information when the identification information described in the association information matches with the identification information described in the association information When the position coincides with the reproduction position indicated by the information indicating the reproduction position described in the association information, the reproduction corresponding to the reproduction position is read from the second recording medium apparatus. The playback device according to claim 1,
An application layer for instructing access to the first recording medium;
A driver layer for controlling the playback unit based on a command passed from the upper level;
A control unit including an input / output management layer that converts an instruction from the application layer into a command to be passed to the driver layer;
The cache control unit
A playback device, comprising: a filter driver layer further provided between the input / output management layer and the driver layer. The playback device according to claim 3, wherein
The filter driver layer is
An access instruction to the first recording medium by the application layer refers to the association information in accordance with the command converted by the input / output management layer, and the data instructed to access based on a reference result is the first Whether or not the data is recorded on the second recording medium. If it is determined that the data is recorded on the second recording medium, the data is read from the second recording medium and input. If it is determined that the data is not recorded on the second recording medium, the driver layer is instructed to read the data from the first recording medium. A reproducing apparatus characterized by the above. The playback device according to claim 1,
An application layer for instructing access to the first recording medium;
A driver layer for controlling the reproducing unit and the recording unit based on a command passed from the upper level;
A control unit including an input / output management layer that converts an instruction from the application layer into a command to be passed to the driver layer;
The cache control unit
A playback device included in the driver layer. The playback apparatus according to claim 5, wherein
The driver layer
An access instruction to the first recording medium by the application layer refers to the association information in accordance with the command converted by the input / output management layer, and the data instructed to access based on a reference result is the first Whether or not the data is recorded on the second recording medium. If it is determined that the data is recorded on the second recording medium, the data is read from the second recording medium and input. When the data is supplied to the output management layer and it is determined that the data is not recorded on the second recording medium, the data is read from the first recording medium and supplied to the input / output management layer. A playback device. The playback device according to claim 1,
An application layer for instructing access to the first recording medium;
A driver layer for controlling the playback unit based on a command passed from the upper level;
A control unit including an input / output management layer that converts an instruction from the application layer into a command to be passed to the driver layer;
The cache control unit
A playback device characterized in that the playback device is included in the application layer. The playback device according to claim 7, wherein
The application layer
When accessing the first recording medium, whether the data read from the first recording medium by the access is recorded on the second recording medium based on the reference result with reference to the association information If it is determined that the data is recorded on the second recording medium, the data is read from the second recording medium, and the data is read to the second recording medium. A reproduction apparatus characterized by instructing the input / output management layer to read the data from the first recording medium when it is determined that the data is not recorded. The playback device according to claim 1,
A reproducing apparatus for managing data on the second recording medium associated with the first recording medium corresponding to the identification information as the virtual first recording medium. The playback device according to claim 9, wherein
The data in the virtual recording medium is
A playback apparatus that plays back continuously in the virtual recording medium based on information indicating a playback position of the association information. The playback device according to claim 1,
The above association information is
A reproducing apparatus recorded on a non-volatile storage or recording medium. The playback device according to claim 1,
The reproducing apparatus according to claim 1, wherein the association information further stores information indicating an update time of the first recording medium in association with the identification information of the first recording medium. The playback device according to claim 12, wherein
The cache control unit
When the update time of the first recording medium is different from the update time corresponding to the first recording medium described in the association information, the first recording medium recorded on the second recording medium A reproduction apparatus characterized by discarding data corresponding to. The playback device according to claim 1,
The association information further stores information indicating the update time of the file recorded on the first recording medium in association with the identification information of the first recording medium,
The cache control unit
A reproducing apparatus characterized in that data reproduced from the first recording medium by the reproducing unit and recorded on the second recording medium is managed in file units on the first recording medium. The playback device according to claim 14, wherein
The cache control unit
If the update time of the file on the first recording medium is different from the update time corresponding to the file of the first recording medium described in the association information, it is recorded on the second recording medium. A playback apparatus characterized in that the file is discarded. When data is reproduced from the detachable first recording medium, the data reproduced from the first recording medium is recorded on the second recording medium having a higher access speed than the first recording medium. And
Identification information for identifying the first recording medium when the first recording medium is accessed, and reproduction of the data reproduced from the first recording medium on the first recording medium Data corresponding to the access position is recorded on the second recording medium based on association information that associates information indicating the position with information indicating the recording position at which the data is recorded on the second recording medium. If the data corresponding to the access position is recorded on the second recording medium based on the determination result, the data is read from the second recording medium. A reproduction method characterized by the above. When data is reproduced from the detachable first recording medium, the data reproduced from the first recording medium is recorded on the second recording medium having a higher access speed than the first recording medium. And
Identification information for identifying the first recording medium when the first recording medium is accessed, and reproduction of the data reproduced from the first recording medium on the first recording medium Data corresponding to the access position is recorded on the second recording medium based on association information that associates information indicating the position with information indicating the recording position at which the data is recorded on the second recording medium. Reproduction based on the determination result, if it is determined that the data corresponding to the access position is recorded on the second recording medium, the data is read from the second recording medium. A reproduction program for causing a computer apparatus to execute the method.

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