JP2005032379A - Device and method for recording - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a writing request by a buffer recording/reproducing unit on a disk recording medium having a recording/reproducing unit larger than a buffer unit. <P>SOLUTION: A memory 4 is managed by a cluster unit and accessed by a sector unit. The management area of the memory 4, the cluster of a disk 90 and a fill bit indicating the validity/invalidity of data by a sector unit are homologized with one another. Based on the writing request of a PC 100 by a sector unit, the address of the memory 4, and the cluster and the fill bit of the target disk 90 are obtained. One cluster of a writing target is read from the disk 90 and written in a reading memory 200. Based on the fill bit, the data of the memory 200 corresponding to the invalid data sector of the memory 4 is written in the memory 4 by a sector unit. The data of the memory 4 is written in the disk 90 by a cluster unit. The writing request of the PC 100 by the sector unit is realized without destroying the data of the disk 90. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a recording apparatus and method for recording data on a recording medium by controlling data transfer between a buffer memory and a storage medium having different recording unit sizes.

  Conventionally, as a recording medium for recording and reproducing digital audio data, a mini disk (MD), which is a magneto-optical disk having a diameter of 64 mm, housed in a cartridge has been widely used. In the MD system, ATRAC (Adaptive TRansform Acoustic Coding) is used as a compression method of audio data, and U-TOC (User TOC (Table Of Contents)) is used for managing music data. That is, an area called U-TOC is provided on the inner periphery of the recordable area of the disc. The U-TOC is management information that is rewritten according to the order of tracks (audio tracks / data tracks), recording, erasure, etc. in the current MD system, and the start position of each track (parts constituting the track). It manages the end position and mode.

  Since the MD system uses a file management method different from the file system based on FAT (File Allocation Table) generally used in personal computers, it has compatibility with general-purpose computers such as personal computers. It wasn't. Therefore, a system has been proposed in which a general-purpose management system such as a FAT system is introduced to improve compatibility with a personal computer. In the FAT system, data is recorded and reproduced in units called FAT sectors. One sector is, for example, 2 kB (kilobytes), and a plurality of sectors gather to form a unit called a cluster.

In order to absorb the speed difference between the recording / reproducing speed of the disk recording medium and the transfer rate of the audio data, particularly when performing continuous data recording / reproducing such as audio data using such a disk recording medium. The buffer memory control technology becomes important. Japanese Patent Application Laid-Open No. H10-228561 describes a technique that can output a monitor sound that can be heard during high-speed dubbing by controlling a buffer memory.
JP 2002-245712 A

  In the MD system described above, one sector is 2 kB, and data can be recorded and reproduced in units of sectors. Therefore, even when the FAT system is introduced, compatibility at the time of recording and reproduction can be easily ensured.

  Here, the disk of the current MD system has a recording capacity of about 160 MB, and as the capacity of hard disk drives and optical disk media progresses, it is no longer difficult to say that the capacity is large. Therefore, there is a need for a disk system with an increased recording capacity while ensuring compatibility with current MDs. In order to increase the capacity of the disk of the current MD system, it is necessary to improve the laser wavelength and the aperture ratio NA of the optical head. However, there is a limit to improving the laser wavelength and the aperture ratio NA of the optical head. Therefore, a system for increasing the capacity using a technique such as magnetic super-resolution has been proposed. In this system, data recording / reproduction is performed in units of clusters of, for example, 64 kB in consideration of efficient use of recording media and improvement in access speed.

  As described above, when a recording medium that performs recording / reproduction with a size different from the recording / reproduction unit of the file system is used, it is necessary to devise a buffer memory control method. For example, when data read from a recording medium in cluster units is written to a buffer memory that can be written in sector units, the necessary data is inadvertently overwritten due to the size of the data to be written being larger than the recording / playback unit of the memory. It is necessary to take care not to mess up.

  Accordingly, an object of the present invention is to provide a recording apparatus and method for appropriately controlling a buffer memory when using a disk-shaped recording medium that performs recording / reproduction in a unit larger than the recording / reproduction unit of the buffer memory. There is.

  In order to solve the above-described problem, the present invention provides a recording apparatus for recording data on a recording medium in a first data unit, a recording means for recording data on the recording medium in a first data unit, Reproducing means for reproducing data from a recording medium in data units, and a first memory in which memory space is managed in units corresponding to the first data units and accessible in a second data unit smaller than the first data unit And a second memory accessible in the second data unit, an address on the first memory, a first data unit of the recording medium, and a memory space management unit corresponding to the address of the first memory A correspondence table associating fill information indicating whether or not data is valid in a second data unit, and a memo for writing recording data to be recorded on the recording medium to the first memory based on the fill information Control means, and when there is a recording request for the recording medium, data in an area where data is recorded by the recording request on the recording medium is reproduced in a first data unit and temporarily stored in the second memory. The recording apparatus is characterized in that it is memorized.

  According to another aspect of the present invention, there is provided a recording method for recording data on a recording medium in a first data unit, a recording step for recording data on the recording medium in a first data unit, and from the recording medium in a first data unit. A step of reproducing data, a memory space is managed in a unit corresponding to the first data unit, and an address on the first memory accessible in a second data unit smaller than the first data unit; Associating a first data unit of the recording medium with fill information indicating in a second data unit whether or not data is valid for the memory space management unit corresponding to the address of the first memory; and recording on the recording medium And a memory control step of writing the recording data to the first memory based on the fill information, and when there is a recording request for the recording medium, Recording method characterized in that data in an area where data is recorded by a recording request is reproduced in a first data unit and temporarily stored in a second memory accessible in a second data unit It is.

  As described above, according to the present invention, the memory space is managed in a unit corresponding to the first data unit, and an address on the first memory that can be accessed in a second data unit smaller than the first data unit; Corresponding the first data unit of the recording medium with the fill information indicating in the second data unit whether or not the data is valid for the memory space management unit corresponding to the address of the first memory in the correspondence table, the recording medium When recording data is written to the first memory based on the fill information and there is a recording request for the recording medium, the data in the area where the data is recorded by the recording request is recorded in the first data unit. And temporarily stored in the second memory accessible in the second data unit, the second data is stored between the first memory and the second memory based on the correspondence table. Data is copied in units of data, the data is read out from the first memory or the second memory in units of the first data, and the data is recorded on the recording medium. Data can be recorded.

  According to the present invention, when data read from a memory that is accessed in units of sectors smaller than a cluster is written to a disk that is accessed in units of clusters, the data written in units of sectors is compared with the data written in the memory. It shows the validity / invalidity. At the same time, when data is written to the disk, data is copied in units of sectors between the memory and the work memory. Therefore, there is an effect that data writing to the disk can be controlled in units of sectors.

  Also, when using the memory as a ring buffer, the data on the disk is written to the work memory in cluster units, the data on the memory is copied to the work memory in sector units, and the data in the work memory is written to the disk in cluster units. Thus, there is an effect that data can be written on the disk in units of sectors without destroying data of other parts on the disk.

  Further, when there is a discontinuous data write request from the computer device to the disk in the sector unit, the data read from the disk in the cluster unit is written to the work memory, and the data written to the work memory is written in the sector unit. The data transferred from the computer device on the memory is written to the address where the data has not been written, and the data is read from the memory in units of clusters and written to the disk. Therefore, there is an effect that discontinuous data can be written on the disk in units of sectors.

Embodiments of the present invention will be described below. Prior to the description of the embodiment of the present invention, a disk system applicable to the present invention will be described in accordance with the following nine sections.
1. 1. Overview of recording method 2. About discs Signal format 4. Configuration of recording / reproducing apparatus 5. About disk initialization processing by next generation MD1 and next generation MD2. 6. About the first management method of music data 7. Second example of music data management method 8. Operation when connected to a personal computer Memory control method

1. Overview of Recording System In the recording / reproducing apparatus according to the present invention, a magneto-optical disk is used as a recording medium. The physical attributes of the disk, such as the form factor, are substantially the same as the disks used by so-called MD (Mini-Disc) systems. However, the data recorded on the disc and how the data is arranged on the disc is different from the conventional MD.

  More specifically, the apparatus according to the present invention uses a FAT (File Allocation Table) system as a file management system for recording and reproducing content data such as audio data. As a result, the apparatus can guarantee compatibility with the current personal computer.

  As used herein, the term “FAT” or “FAT system” is used generically to refer to various PC-based file systems, and a specific FAT base used in DOS (Disk Operating System). File systems, VFAT (Virtual FAT) used in Windows 95/98 (each registered trademark), FAT32 used in Windows 98 / ME / 2000 (each registered trademark), and NTFS (also called NT File System (New Technology File System) )) Is not intended to indicate any of the above. NTFS is a file system used in the Windows NT (registered trademark) operating system or (optionally) Windows 2000, and records and retrieves files when reading / writing to / from a disk.

  In the present invention, the error correction method and the modulation method are improved with respect to the current MD system to increase the data recording capacity and improve the data reliability. Furthermore, according to the present invention, the content data is encrypted and illegal copying is prevented to protect the copyright of the content data.

  As a recording / playback format, the specification of the next generation MD1 that uses a disk (that is, a physical medium) exactly the same as the disk used in the current MD system, and the disk used in the current MD system. The form factor and external shape are the same, but there is a next-generation MD2 specification that uses magnetic super-resolution (MSR) technology to increase the recording density in the linear recording direction and further increase the recording capacity. Developed by the present inventors.

  In the current MD system, a magneto-optical disk having a diameter of 64 mm housed in a cartridge is used as a recording medium. The disc has a thickness of 1.2 mm, and a center hole having a diameter of 11 mm is provided at the center thereof. The cartridge has a length of 68 mm, a width of 72 mm, and a thickness of 5 mm.

  The shape of the disc and the shape of the cartridge are all the same in the specifications of the next generation MD1 and the specification of the next generation MD2. Regarding the start position of the lead-in area, the next-generation MD1 specification and the next-generation MD2 specification disc start from 29 mm and are the same as the disc used in the current MD system.

  Regarding the track pitch, in the next generation MD2, it is considered to be 1.2 μm to 1.3 μm (for example, 1.25 μm). On the other hand, in the next generation MD1, which uses a disk of the current MD system, the track pitch is set to 1.6 μm. The next-generation MD1 is 0.44 μm / bit and the next-generation MD2 is 0.16 μm / bit. The redundancy is 20.50% for both the next generation MD1 and the next generation MD2.

  In the next-generation MD2 specification disk, the recording capacity in the linear density direction is improved by using a magnetic super-resolution technique. In the magnetic super-resolution technology, when a predetermined temperature is reached, the cut layer becomes magnetically neutral, and the magnetic wall transferred to the reproducing layer moves, so that a minute mark appears large in the beam spot. It is a thing using what becomes.

  That is, in the next-generation MD2 specification disk, a magnetic layer serving as a recording layer for recording information, a cutting layer, and a magnetic layer for reproducing information are stacked on a transparent substrate. The cutting layer is an exchange coupling force adjusting layer. When the temperature reaches a predetermined temperature, the cut layer becomes magnetically neutral, and the domain wall transferred to the recording layer is transferred to the reproducing magnetic layer. As a result, minute marks can be seen in the beam spot. At the time of recording, a minute mark can be generated by using a laser pulse magnetic field modulation technique.

  In addition, in the next-generation MD2 specification disc, the groove is made deeper than conventional MD discs to improve the detrack margin, crosstalk from the land, crosstalk of the wobble signal, and leakage of focus. It is sharp. In the disc of the next generation MD2 specification, the groove depth is, for example, 160 nm to 180 nm, the groove inclination is, for example, 60 degrees to 70 degrees, and the groove width is, for example, 600 nm to 700 nm.

  As for the optical specifications, the laser wavelength λ is 780 nm and the aperture ratio NA of the objective lens of the optical head is 0.45 in the next generation MD1 specification. Similarly, in the specification of the next generation MD2, the laser wavelength λ is 780 nm, and the aperture ratio NA of the optical head is 0.45.

  As a recording method, the groove recording method is adopted for both the next generation MD1 specification and the next generation MD2 specification. That is, the groove (groove on the disk surface of the disk) is used as a track for recording and reproduction.

  As an error correction coding method, convolutional codes based on ACIRC (Advanced Cross Interleave Reed-Solomon Code) have been used in the current MD system, but in the specifications of the next generation MD1 and the next generation MD2, RS-LDC (Reed A block-complete code combining Solomon-Long Distance Code (BOS) and Burst Indicator Subcode (BIS) is used. By adopting a block completion type error correction code, a linking sector becomes unnecessary. In an error correction method combining LDC and BIS, an error location can be detected by BIS when a burst error occurs. Using this error location, erasure correction can be performed by the LDC code.

  As an addressing method, a wobbled groove method is used in which a single spiral groove is formed and wobbles as address information are formed on both sides of the groove. Such an address system is called ADIP (Address in Pregroove). The specifications of the current MD system and the next generation MD1 and the next generation MD2 have different line densities, and the current MD system uses a convolutional code called ACIRC as an error correction code. In the specifications of the generation MD1 and the next generation MD2, since a block completion type code combining LDC and BIS is used, the redundancy is different and the relative positional relationship between ADIP and data is changed. Therefore, in the specification of the next generation MD1, which uses a disk having the same physical structure as that of the current MD system, the handling of the ADIP signal is made different from that in the current MD system. In the next-generation MD2 specification, the specification of the ADIP signal is changed so as to match the specification of the next-generation MD2.

  As for the modulation method, EFM (8 to 14 Modulation) is used in the current MD system, whereas in the specifications of the next generation MD1 and the next generation MD2, RLL (1, 7) PP (RLL; Run Length Limited, PP; Parity Preserve / Prohibit rmtr (repeated minimum transition run length)) (hereinafter referred to as 1-7pp modulation) is employed. The data detection method is a Viterbi decoding method using a partial response PR (1, 2, 1) ML in the next generation MD1 and a partial response PR (1, -1) ML in the next generation MD2. .

  The disk drive system is CLV (Constant Linear Verocity) or ZCAV (Zone Constant Angular Verocity), and the standard linear velocity is 2.4 m / sec in the next generation MD1 specification, and in the next generation MD2 specification, 1.98 m / sec. In the specification of the current MD system, it is 1.2 m / second for a 60-minute disk and 1.4 m / second for a 74-minute disk.

  In the specification of the next generation MD1, which uses the disk used in the current MD system as it is, the total data recording capacity per disk is about 300 Mbytes (when an 80-minute disk is used). By changing the modulation method from EFM to 1-7pp modulation, the window margin is changed from 0.5 to 0.666, and in this respect, a 1.33 times higher density can be realized. Further, since the error correction method is a combination of BIS and LDC from the ACIRC method, the data efficiency is improved, and in this respect, 1.48 times higher density can be realized. Overall, a data capacity of about twice that of the current MD system was realized using exactly the same disk.

  In the next-generation MD2 specification disk using magnetic super-resolution, the recording density is further increased in the linear density direction, and the total data recording capacity is about 1 Gbyte.

  The data rate is 4.4 Mbit / sec for the next generation MD1 and 9.8 Mbit / sec for the next generation MD2 at the standard linear velocity.

2. Disc FIG. 1 shows the configuration of a disc of the next generation MD1. The next-generation MD1 disc is a disc of the current MD system. That is, the disk is configured by laminating a dielectric film, a magnetic film, a dielectric film, and a reflective film on a transparent polycarbonate substrate. Further, a protective film is laminated thereon.

  In the disc of the next generation MD1, as shown in FIG. 1, the inner circumference of the disc (the innermost circumference of the recordable area of the disc (“innermost” indicates the innermost side in the direction extending radially from the center of the disc)) In the lead-in area, a P-TOC (pre-mastered TOC (Table Of Contents)) area is provided, which is a pre-mastered area as a physical structure. For example, it is recorded as P-TOC information.

  The outer periphery of the lead-in area in which the P-TOC area is provided (the outer periphery in the direction extending radially from the center of the disk) is a recordable area (a magneto-optical recording area), and a groove is formed as a guide groove for a recording track. It is a formed recordable / reproducible area. A U-TOC (user TOC) is provided on the inner periphery of the recordable area.

  The U-TOC has the same configuration as the U-TOC used for recording disc management information in the current MD system. The U-TOC is management information that is rewritten according to the order of tracks (audio tracks / data tracks), recording, erasure, etc. in the current MD system, and the start position of each track (parts constituting the track). It manages the end position and mode.

  An alert track is provided on the outer periphery of the U-TOC. This track records a warning sound that is activated (output) by the MD player when the disc is loaded into the current MD system. This warning sound indicates that the disc is used in the next generation MD1 system and cannot be reproduced by the current system. The remaining portion of the recordable area (shown in detail in FIG. 2) extends radially to the lead-out area.

  FIG. 2 shows the structure of the recordable area of the disc of the next generation MD1 specification shown in FIG. As shown in FIG. 2, a U-TOC and an alert track are provided at the beginning (inner circumference side) of the recordable area. In the area including the U-TOC and the alert track, the data is modulated by EFM and recorded so that it can be reproduced by a player of the current MD system. An area where data is modulated and recorded by 1-7pp modulation of the next generation MD1 system is provided on the outer periphery of the area where the data is modulated and recorded by EFM modulation. The area where data is modulated and recorded by EFM and the area where data is modulated and recorded by 1-7pp modulation are separated by a predetermined distance, and a “guard band” is provided. Yes. Since such a guard band is provided, it is possible to prevent the occurrence of problems by mounting a disc of the next generation MD1 specification on the current MD player.

  A DDT (Disc Description Table) area and a reserve track are provided at the head (inner circumference side) of an area where data is modulated and recorded by 1-7pp modulation. The DDT area is provided in order to perform a replacement process for a physically defective area. In the DDT area, an identification code unique to each disk is further recorded. Hereinafter, the identification code unique to each disk is referred to as UID (unique ID). In the case of the next-generation MD1, the UID is generated based on, for example, a predetermined random number, and is recorded, for example, when the disc is initialized (details will be described later). By using the UID, it is possible to perform security management for the recorded contents of the disc. The reserve track stores information for protecting the content.

  Furthermore, a FAT (File Allocation Table) area is provided in an area where data is modulated and recorded by 1-7 pp modulation. The FAT area is an area for managing data in the FAT system. The FAT system performs data management conforming to the FAT system used in general-purpose personal computers. The FAT system performs file management by a FAT chain using a directory indicating entry points of files and directories at the root and a FAT table in which FAT cluster connection information is described. Note that the terminology of FAT is generally used to indicate various different file management methods used in the PC operating system as described above.

  In the disc of the next generation MD1 specification, information on the start position of the alert track and information on the start position of the area where the data is modulated by 1-7pp modulation are recorded in the U-TOC area.

  When the next-generation MD1 disc is loaded into the player of the current MD system, the U-TOC area is read, the position of the alert track is known from the U-TOC information, the alert track is accessed, and the alert track Playback starts. In the alert track, a warning sound is recorded indicating that this disc is used in the next generation MD1 system and cannot be reproduced by a player of the current MD system. This warning sound informs that this disc cannot be used with current MD system players.

  The warning sound may be a warning in a language such as “cannot be used with this player”. Of course, a simple beep, tone, or other warning signal may be used.

  When a next-generation MD1 disc is loaded into a player compliant with the next-generation MD1, the U-TOC area is read, and the start position of the area where data is recorded by 1-7pp modulation is determined from the U-TOC information. Okay, DDT, reserve track, FAT area is read. In the data area of 1-7pp modulation, data management is performed using the FAT system without using the U-TOC.

  FIG. 3 shows a next-generation MD2 disc. The disk is configured by laminating a dielectric film, a magnetic film, a dielectric film, and a reflective film on a transparent polycarbonate substrate. Further, a protective film is laminated thereon.

  In the next-generation MD2 disc, as shown in FIG. 3A, control information is recorded by an ADIP signal in the lead-in area on the inner circumference of the disc (the inner circumference in the direction extending radially from the center of the disc). . Next-generation MD2 discs are not provided with P-TOC by embossed pits in the lead-in area, and instead, control information by ADIP signals is used. The recordable area is started from the outer periphery of the lead-in area, and is a recordable / reproducible area in which grooves are formed as guide grooves for recording tracks. In this recordable area, data is modulated and recorded by 1-7 pp modulation.

  In the disc of the next generation MD2 specification, as shown in FIG. 3B, a magnetic layer 101 serving as a recording layer for recording information, a cutting layer 102, and a magnetic layer 103 for reproducing information are stacked as magnetic films. Things are used. The cutting layer 102 is an exchange coupling force adjusting layer. When the temperature reaches a predetermined temperature, the cutting layer 102 becomes magnetically neutral, and the domain wall transferred to the recording layer 101 is transferred to the reproducing magnetic layer 103. As a result, a minute mark appears enlarged in the beam spot of the reproducing magnetic layer 103 on the recording layer 101.

  Although not shown, the above-mentioned UID is pre-recorded in an area that can be reproduced by a consumer recording / reproducing apparatus, but cannot be recorded, on the inner circumference side of the recordable area on a disc using the next generation MD2. The In the case of a next-generation MD2 disc, the UID is recorded in advance when the disc is manufactured by a technique similar to the technique of BCA (Burst Ctting Area) used in, for example, a DVD (Digital Versatile Disc). Since the UID is generated and recorded when the disc is manufactured, the UID can be managed, and the security can be improved as compared with the case where the UID is generated based on a random number when the disc is initialized by the next generation MD1. Details of the format of the UID will be described later.

  In order to avoid complexity, this area where the UID is recorded in advance in the next generation MD2 will be referred to as BCA hereinafter.

  Whether it is the next generation MD1 or the next generation MD2 can be determined from, for example, lead-in information. That is, if a P-TOC due to an emboss pit is detected in the lead-in, it can be determined that the disc is a current MD or next-generation MD1 disc. If control information based on the ADIP signal is detected in the lead-in and P-TOC due to the emboss pit is not detected, it can be determined that the next generation MD2. It is also possible to determine whether or not a UID is recorded in the BCA described above. The discrimination between the next generation MD1 and the next generation MD2 is not limited to such a method. It is also possible to discriminate from the phase of the tracking error signal between on-track and off-track. Of course, a disc identification detection hole or the like may be provided.

  FIG. 4 shows the configuration of the recordable area of the disc of the next-generation MD2 specification. As shown in FIG. 4, in the recordable area, data is modulated and recorded with 1-7pp modulation, and DDT is recorded at the head (inner circumference side) of the area where data is modulated with 1-7pp modulation and recorded. An area and a reserve track are provided. The DDT area is provided for recording replacement area management data for managing a replacement area for a physically defective area.

  Specifically, the DDT area records a management table for managing a replacement area including a recordable area that replaces the physically defective area. This management table records the logical clusters determined to be defective, and also records the logical cluster (s) in the replacement area assigned as a replacement for the defective logical cluster. Further, the above-described UID is recorded in the DDT area. The reserve track stores information for protecting the content.

  Furthermore, a FAT area is provided in an area where data is modulated and recorded by 1-7pp modulation. The FAT area is an area for managing data in the FAT system. The FAT system performs data management conforming to the FAT system used in general-purpose personal computers.

  The U-TOC area is not provided in the next-generation MD2 disc. When a next-generation MD2 disc is loaded into a player compliant with the next-generation MD2, the DDT, reserve track, and FAT area at predetermined positions are read, and data management is performed using the FAT system.

  The next generation MD1 and next generation MD2 discs do not require time-consuming initialization work. In other words, the next generation MD1 and next generation MD2 specification discs require no initialization work other than the creation of minimum tables such as DDT, reserve track, and FAT table, and recordable areas can be recorded from unused discs. Reproduction can be performed directly.

  As described above, since the UID is generated and recorded at the time of manufacturing the disc as described above, the next-generation MD2 disc can perform security management more strongly, while being used in the disc used in the current MD system. Compared to this, the number of laminated films is larger and more expensive. Therefore, the recordable area and lead-in / lead-out area of the disc are common to the next generation MD1, and only the UID is recorded at the time of manufacturing the disc in the same manner as the next generation MD2 using the same BCA as the DVD. A disk system (referred to as next generation MD1.5) has been proposed.

  In the following, the description of the next generation MD1.5 will be omitted unless particularly required. That is, the next generation MD1.5 conforms to the next generation MD2 with respect to the UID, and conforms to the next generation MD1 with respect to recording and reproduction of audio data.

  The UID will be described in more detail. As described above, in the next-generation MD2 disc, the UID is recorded in advance when the disc is manufactured by a technique similar to the technique called BCA used in the DVD. FIG. 5 schematically shows an example format of this UID. The entire UID is called a UID record block.

  In the UID block, the 2 bytes from the beginning are used as the UID code field. In the UID code, the upper 4 bits of 2 bytes, that is, 16 bits are used for disc identification. For example, when these 4 bits are [0000], it indicates that the disk is a next-generation MD2 disk, and [0001] indicates that the disk is a next-generation MD1.5 disk. Other values of the upper 4 bits of the UID code are reserved for future expansion, for example. The lower 12 bits of the UID code are an application ID and can correspond to 4096 types of services.

  Next to the UID code, a 1-byte version number field is arranged, and then, a 1-byte data length field is arranged. This data length indicates the data length of the field of the UID record data arranged next to the data length. The field of UID record data is arranged for 4 m (m = 0, 1, 2,...) Bytes within a range where the data length of the entire UID does not exceed 188 bytes. A unique ID generated by a predetermined method can be stored in the field of UID record data, thereby making it possible to identify a disc individual.

  In the next-generation MD1 disc, an ID generated based on a random number is recorded in the field of the UID record data.

  A plurality of UID record blocks can be created with a data length of up to 188 bytes.

3. Next, the signal format of the next generation MD1 and next generation MD2 systems will be described. In the current MD system, ACIRC, which is a convolutional code, is used as an error correction method, and a sector of 2352 bytes corresponding to the data amount of a subcode block is used as an access unit for recording and reproduction. In the case of a convolutional code, since an error correction coding sequence spans a plurality of sectors, it is necessary to prepare a linking sector between adjacent sectors when data is rewritten. As an address method, ADIP, which is a wobbled groove method in which wobbling as address information is formed on both sides of a groove after forming a groove by a single spiral, is used. In the current MD system, ADIP signals are arranged so as to be optimal for accessing a sector of 2352 bytes.

  On the other hand, in the specifications of the next-generation MD1 and next-generation MD2 systems, a block-complete code combining LDC and BIS is used, and 64 Kbytes are used as a recording / reproduction access unit. In a block-complete code, no linking sector is required. Therefore, in the specification of the next generation MD1 system that uses the current MD system disk, the handling of the ADIP signal is changed so as to correspond to the new recording method. Further, in the specification of the next-generation MD2 system, the specification of the ADIP signal is changed so as to match the specification of the next-generation MD2.

  FIGS. 6, 7, and 8 are for explaining error correction methods used in the next-generation MD1 and next-generation MD2 systems. In the next-generation MD1 and next-generation MD2 systems, an error correction coding method using LDC as shown in FIG. 6 and a BIS method as shown in FIGS. 7 and 8 are combined.

  FIG. 6 shows a configuration of a coding block for error correction coding by LDC. As shown in FIG. 6, an error detection code EDC of 4 bytes is added to the data of each error correction encoding sector, and the data is stored in an error correction encoding block of 304 bytes in the horizontal direction and 216 bytes in the vertical direction. Are two-dimensionally arranged. Each error correction coding sector consists of 2K bytes of data. As shown in FIG. 6, an error correction coding block consisting of 304 bytes in the horizontal direction and 216 bytes in the vertical direction has 32 sectors of error correction coding sectors consisting of 2K bytes. Thus, 32-bit error correction is performed in the vertical direction for the data of the 32 error-correction coding sector error correction coding blocks that are two-dimensionally arranged in 304 bytes in the horizontal direction and 216 bytes in the vertical direction. The parity of Reed-Solomon code is added.

  7 and 8 show the configuration of the BIS. As shown in FIG. 7, 1 byte of BIS is inserted for every 38 bytes of data, and (38 × 4 = 152 bytes) of data, 3 bytes of BIS data, and 2.5 bytes of frame sync. A total of 157.5 bytes is taken as one frame.

  As shown in FIG. 8, the BIS block is configured by collecting 496 frames configured as described above. BIS data (3 × 496 = 1488 bytes) includes 576 bytes of user control data, 144 bytes of address unit number, and 768 bytes of error correction code.

  As described above, since the 768-byte error correction code is added to the 1488-byte data in the BIS data, it is possible to perform error correction strongly. By embedding this BIS code every 38 bytes, an error location can be detected when a burst error occurs. Using this error location, erasure correction can be performed by the LDC code.

  As shown in FIG. 9, the ADIP signal is recorded by forming wobbles on both sides of the single spiral groove. That is, the ADIP signal has FM-modulated address data and is recorded by being formed as a groove wobble on the disk material.

  FIG. 10 shows the sector format of the ADIP signal in the case of the next generation MD1.

  As shown in FIG. 10, one sector (ADIP sector) of the ADIP signal includes a 4-bit sync, an upper bit of the 8-bit ADIP cluster number, a lower bit of the 8-bit ADIP cluster number, and an 8-bit ADIP. It consists of a sector number and a 14-bit error detection code CRC.

  The sync is a signal having a predetermined pattern for detecting the head of the ADIP sector. Since the conventional MD system uses a convolutional code, a linking sector is required. The sector number for linking is a sector number having a negative value and is a sector number of “FCh”, “FDh”, “FEh”, “FFh” (h indicates a hexadecimal number). In the next generation MD1, since the disc of the current MD system is used, the format of this ADIP sector is the same as that of the current MD system.

  In the next-generation MD1 system, as shown in FIG. 11, an ADIP cluster is composed of 36 sectors from ADIP sector numbers “FCh” to “FFh” and “0Fh” to “1Fh”. Then, as shown in FIG. 10, data of two recording blocks (64 Kbytes) are arranged in one ADIP cluster.

  FIG. 12 shows the configuration of the ADIP sector in the case of the next generation MD2. In the specification of the next generation MD2, the ADIP sector is composed of 16 sectors. Therefore, the sector number of ADIP can be expressed by 4 bits. In the next-generation MD, since a block-complete error correction code is used, a linking sector is unnecessary.

  As shown in FIG. 12, the ADIP sector of the next generation MD2 includes a 4-bit sync, an upper bit of the 4-bit ADIP cluster number, a middle bit of the 8-bit ADIP cluster number, and a 4-bit ADIP cluster number. Lower bits, a 4-bit ADIP sector number, and an 18-bit parity for error correction.

  The sync is a signal having a predetermined pattern for detecting the head of the ADIP sector. As the ADIP cluster number, 16 bits of upper 4 bits, middle 8 bits, and lower 4 bits are described. Since the ADIP cluster is composed of 16 ADIP sectors, the sector number of the ADIP sector is 4 bits. In the current MD system, it is a 14-bit error detection code, but it is an 18-bit parity for error correction. In the next generation MD2 specification, as shown in FIG. 13, one recording block (64 Kbytes) of data is arranged in one ADIP cluster.

  FIG. 14 shows the relationship between ADIP clusters and BIS frames in the case of the next generation MD1.

  As shown in FIG. 11, according to the specification of the next generation MD1, 36 ADAD sectors “FC” to “FF” and ADIP sectors “00” to “1F” constitute one ADIP cluster. Two pieces of data of one recording block (64 Kbytes) serving as a recording / reproducing unit are arranged in one ADIP cluster.

  As shown in FIG. 14, one ADIP sector is divided into the first 18 sectors and the second 18 sectors.

  Data of one recording block as a recording / reproduction unit is arranged in a BIS block composed of 496 frames. A preamble of 10 frames (frame “0” to frame “9”) is added before the data frame (frame “10” to frame “505”) corresponding to the BIS block, and Then, a postamble frame of 6 frames (frame 506 to frame 511) is added after this data frame, and a total of 512 frames of data is an ADIP cluster of ADIP sector “FCh” to ADIP sector “0Dh”. And the second half of the ADIP cluster from ADIP sector “0Eh” to ADIP sector “1Fh”. The preamble frame before the data frame and the postamble frame after the data are used to protect the data when linking with the adjacent recording block. The preamble is also used for pulling in a data PLL, signal amplitude control, signal offset control, and the like.

  The physical address for recording / reproducing data of the recording block is specified by the ADIP cluster and the first half or the second half of the cluster. When a physical address is designated at the time of recording / reproduction, the ADIP sector is read from the ADIP signal, the ADIP cluster number and the ADIP sector number are read from the reproduction signal of the ADIP sector, and the first half and the second half of the ADIP cluster are discriminated.

  FIG. 15 shows the relationship between an ADIP cluster and a BIS frame in the case of the next-generation MD2 specification. As shown in FIG. 13, in the next generation MD2 specification, there are 16 ADIP sectors and one ADIP cluster is configured. One recording block (64 Kbytes) of data is arranged in one ADIP cluster.

  As shown in FIG. 15, data of one recording block (64 Kbytes) serving as a recording / reproduction unit is arranged in a BIS block composed of 496 frames. A preamble of 10 frames (frame “0” to frame “9”) is added before the data frame (frame “10” to frame “505”) corresponding to the BIS block, and Then, a postamble frame of 6 frames (frame 506 to frame 511) is added to the frame of this data, and a total of 512 frames of data is an ADIP composed of ADIP sector “0h” to ADIP sector “Fh”. Placed in a cluster.

  The preamble frame before the data frame and the postamble frame after the data are used to protect the data when linking with the adjacent recording block. The preamble is also used for pulling in a data PLL, signal amplitude control, signal offset control, and the like.

  A physical address when recording / reproducing data of a recording block is designated by an ADIP cluster. When a physical address is designated at the time of recording / reproduction, the ADIP sector is read from the ADIP signal, and the ADIP cluster number is read from the reproduction signal of the ADIP sector.

  By the way, in such a disc, various control information is necessary to control the laser power and the like when recording / reproduction is started. As shown in FIG. 1, the next-generation MD1 disc has a P-TOC in the lead-in area, and various control information is acquired from the P-TOC.

  Next-generation MD2 specification discs are not provided with P-TOC by embossed pits, and control information is recorded by ADIP signals in the lead-in area. In addition, since the magnetic super-resolution technology is used in the next-generation MD2 specification disk, laser power control is important. In the disc of the next generation MD2 specification, calibration areas for power control adjustment are provided in the lead-in area and the lead-out area.

  That is, FIG. 16 shows the lead-in and lead-out configuration of the disc of the next-generation MD2 specification. As shown in FIG. 16, in the lead-in and lead-out areas of the disk, a power calibration area is provided as a laser beam power control area.

  In the lead-in area, a control area in which control information by ADIP is recorded is provided. The recording of control information by ADIP describes the control information of the disc using the area allocated as the lower bits of the ADIP cluster number.

  That is, the ADIP cluster number starts from the start position of the recordable area and has a negative value in the lead-in area. As shown in FIG. 16, the ADIP sector of the next generation MD2 includes a 4-bit sync, an upper bit of the 8-bit ADIP cluster number, 8-bit control data (lower bits of the ADIP cluster number), 4-bit It consists of an ADIP sector number and an 18-bit error correction parity. As shown in FIG. 16, control information such as a disk type, magnetic phase, intensity, and read power is described in 8 bits assigned as lower bits of the ADIP cluster number.

  Since the upper bits of the ADIP cluster are left as they are, the current position can be known with a certain degree of accuracy. Further, the ADIP sector “0” and the ADIP sector “8” can accurately know the ADIP cluster at a predetermined interval by leaving the lower 8 bits of the ADIP cluster number.

  The recording of the control information by the ADIP signal is described in detail in the specification of Japanese Patent Application No. 2001-123535 previously proposed by the present applicant.

4). Configuration of Recording / Reproducing Device Next, the configuration of a disc drive device (recording / reproducing device) corresponding to a disc used for recording / reproducing in the next generation MD1 and next generation MD2 systems will be described with reference to FIGS.

  FIG. 17 shows that the disk drive device 1 can be connected to, for example, a personal computer 100.

  The disk drive device 1 includes a media drive unit 2, a memory transfer controller 3, a cluster buffer memory 4, an auxiliary memory 5, USB (Universal Serial Bus) interfaces 6 and 8, a USB hub 7, a system controller 9, and an audio processing unit 10. ing.

  The media drive unit 2 performs recording / reproduction with respect to the loaded disk 90. The disk 90 is a next-generation MD1 disk, a next-generation MD2 disk, or a current MD disk. The internal configuration of the media drive unit 2 will be described later with reference to FIG.

  The memory transfer controller 3 controls delivery of playback data from the media drive unit 2 and recording data supplied to the media drive unit 2.

  The cluster buffer memory 4 performs buffering of data read from the data track of the disk 90 by the media drive unit 2 in units of recording blocks based on the control of the memory transfer controller 3.

  The auxiliary memory 5 stores various management information and special information read from the disk 90 by the media drive unit 2 based on the control of the memory transfer controller 3.

  The system controller 9 is connected to a CPU (Central Processing Unit), a RAM (Random Access Memory) 9A used as a work memory of the CPU, a ROM (Read Only Memory) in which programs and data are stored in advance, and the CPU, RAM 9A, and ROM. And an overall bus in the disk drive device 1 based on a program stored in the ROM, and a communication control with the connected personal computer 100.

  That is, the system controller 9 can communicate with the personal computer 100 connected via the USB interface 8 and the USB hub 7, receives commands such as write requests and read requests, status information, and other necessary information. And so on.

  For example, the system controller 9 instructs the media drive unit 2 to read management information from the disk 90 when the disk 90 is loaded into the media drive unit 2, and the management information read by the memory transfer controller 3. Is stored in the auxiliary memory 5.

  When there is a request to read a FAT sector from the personal computer 100, the system controller 9 causes the media drive unit 2 to read a recording block including the FAT sector. The read recording block data is written into the cluster buffer memory 4 by the memory transfer controller 3.

  The system controller 9 performs control to read out the requested FAT sector data from the recording block data written in the cluster buffer memory 4 and transmit it to the personal computer 100 via the USB interface 6 and the USB hub 7. .

  When there is a write request for a certain FAT sector from the personal computer 100, the system controller 9 first causes the media drive unit 2 to read the recording block including the FAT sector. The read recording block is written into the cluster buffer memory 4 by the memory transfer controller 3.

  The system controller 9 supplies the FAT sector data (record data) from the personal computer 100 to the memory transfer controller 3 via the USB interface 6 and rewrites the data of the corresponding FAT sector on the cluster buffer memory 4. Let

  The system controller 9 instructs the memory transfer controller 3 to transfer the recording block data stored in the cluster buffer memory 4 with the necessary FAT sector being rewritten to the media drive unit 2 as recording data. In the media drive unit 2, the recording data of the recording block is modulated and written to the disk 90.

  A switch 50 is connected to the system controller 9. The switch 50 sets the operation mode of the disk drive device 1 to either the next generation MD1 system or the current MD system. In other words, the disk drive apparatus 1 can record audio data on the disk 90 of the current MD system in both the current MD system format and the next-generation MD1 system format. The switch 50 can explicitly indicate the operation mode of the disk drive device 1 main body to the user. Although a mechanical switch is shown, a switch utilizing electricity or magnetism, or a hybrid type switch may be used.

  For the disk drive device 1, a display 51 made of, for example, an LCD (Liquid Crystal Display) is provided. The display 51 can display text data, simple icons, and the like, and displays information related to the state of the disk drive device 1 and a message to the user based on a display control signal supplied from the system controller 9.

  The audio processing unit 10 includes an analog audio signal input unit such as a line input circuit / microphone input circuit, an A / D converter, and a digital audio data input unit as an input system. The audio processing unit 10 includes an ATRAC compression encoder / decoder and a buffer memory for compressed data. Furthermore, the audio processing unit 10 includes an analog audio signal output unit such as a digital audio data output unit and a D / A converter and a line output circuit / headphone output circuit as an output system.

  When the disc 90 is a current MD disc, digital audio data (or an analog audio signal) is input to the audio processing unit 10 when an audio track is recorded on the disc 90. The input linear PCM digital audio data or the linear PCM audio data obtained by converting the analog audio signal and converting it by the A / D converter is subjected to ATRAC compression encoding and stored in the buffer memory. Then, the data is read from the buffer memory at a predetermined timing (data unit corresponding to the ADIP cluster) and transferred to the media drive unit 2. In the media drive unit 2, the transferred compressed data is modulated by EFM and written on the disk 90 as an audio track.

  When the disc 90 is a disc of the current MD system, when the audio track of the disc 90 is reproduced, the media drive unit 2 demodulates the reproduction data into the ATRAC compressed data state and transmits the audio via the memory transfer controller 3. Transfer to the processing unit 10. The audio processing unit 10 performs ATRAC compression decoding to obtain linear PCM audio data, which is output from the digital audio data output unit. Alternatively, line output / headphone output is performed as an analog audio signal by a D / A converter.

  The connection with the personal computer 100 is not USB, and other external interfaces such as IEEE (Institute of Electrical and Electronics Engineers) 1394 may be used.

  Recording / reproduction data management is performed using a FAT system, and conversion between recording blocks and FAT sectors is described in detail in the specification of Japanese Patent Application No. 2001-289380 previously proposed by the present applicant. .

  Next, the configuration of the media drive unit 2 having the function of recording and reproducing both the data track and the audio track will be described with reference to FIG.

  FIG. 18 shows the configuration of the media drive unit 2. The media drive unit 2 has a turntable on which a current MD system disc, a next generation MD1 disc, and a next generation MD2 disc are loaded. In the media drive unit 2, the turntable is loaded on the turntable. The disk 90 is rotated by the spindle motor 29 in the CLV method. The disc 90 is irradiated with laser light from the optical head 19 during recording / reproduction.

  The optical head 19 performs a high level laser output for heating the recording track to the Curie temperature during recording, and a relatively low level laser output for detecting data from reflected light by the magnetic Kerr effect during reproduction. . For this reason, the optical head 19 is mounted with a laser diode as a laser output means, an optical system composed of a polarizing beam splitter, an objective lens, etc., and a detector for detecting reflected light, although detailed illustration is omitted here. Yes. The objective lens provided in the optical head 19 is held so as to be displaceable in a radial direction of the disk and a direction in which it is in contact with or separated from the disk, for example, by a biaxial mechanism.

  A magnetic head 18 is disposed at a position facing the optical head 19 with the disk 90 interposed therebetween. The magnetic head 18 performs an operation of applying a magnetic field modulated by the recording data to the disk 90. Although not shown, a sled motor and a sled mechanism are provided to move the entire optical head 19 and the magnetic head 18 in the disk radial direction.

  In the case of the next-generation MD2 disk, the optical head 19 and the magnetic head 18 can form minute marks by performing pulse drive magnetic field modulation. In the case of a current MD disc or a next-generation MD1 disc, a DC light-emission magnetic field modulation method is used.

  In the media drive unit 2, a recording processing system, a playback processing system, a servo system, and the like are provided in addition to the recording / reproducing head system using the optical head 19 and the magnetic head 18 and the disk rotation driving system using the spindle motor 29.

  As the disk 90, there is a possibility that a current MD specification disk, a next generation MD1 specification disk, and a next generation MD2 specification disk may be mounted. These disks have different linear velocities. The spindle motor 29 can be rotated at a rotational speed corresponding to a plurality of types of disks having different linear velocities. The disc 90 loaded on the turntable is rotated according to the linear velocity of the current MD specification disc, the linear velocity of the next generation MD1 specification disc, and the linear velocity of the next generation MD2 specification disc. The

  In the recording processing system, in the case of a disc of the current MD system, at the time of recording an audio track, error correction coding is performed by ACIRC, data is recorded by being modulated by EFM, and the next generation MD1 or next generation MD2 is recorded. In some cases, a part for performing error correction coding by a combination of BIS and LDC and modulating and recording with 1-7pp modulation is provided.

  The playback processing system uses EFM demodulation and ACIRC error correction processing during playback of current MD system discs, and data detection using partial response and Viterbi decoding during playback of next-generation MD1 or next-generation MD2 system discs. A portion for performing 1-7 demodulation based on the above and error correction processing by BIS and LDC is provided.

  Further, there are provided a part for decoding an address based on an ADIP signal of the current MD system or the next generation MD1, and a part for decoding an ADIP signal of the next generation MD2.

  Information (photocurrent obtained by detecting the laser reflected light by the photodetector) detected as reflected light by the laser irradiation of the optical head 19 on the disk 90 is supplied to the RF amplifier 21.

  The RF amplifier 21 performs current-voltage conversion, amplification, matrix calculation, and the like on the input detection information, and performs reproduction RF signal, tracking error signal TE, focus error signal FE, groove information (track on the disk 90) as reproduction information. ADIP information recorded by wobbling) is extracted.

  When reproducing the disc of the current MD system, the reproduced RF signal obtained by the RF amplifier is processed by the EFM demodulator 24 and the ACIRC decoder 25. That is, the reproduced RF signal is binarized by the EFM demodulator 24 to be converted into an EFM signal sequence, EFM demodulated, and further subjected to error correction and deinterleave processing by the ACIRC decoder 25. That is, at this time, the state becomes ATRAC compressed data.

  At the time of reproducing the disk of the current MD system, the selector 26 is selected on the B contact side, and the demodulated ATRAC compressed data is output as reproduced data from the disk 90.

  On the other hand, when reproducing the next-generation MD1 or next-generation MD2 disc, the reproduced RF signal obtained by the RF amplifier is processed by the RLL (1-7) PP demodulator 22 and the RS-LDC decoder 23. That is, the reproduced RF signal is detected by the RLL (1-7) PP demodulator 22 by means of data detection using PR (1, 2, 1) ML or PR (1, -1) ML and Viterbi decoding. ) Reproduced data as a code string is obtained, and RLL (1-7) demodulation processing is performed on this RLL (1-7) code string. Further, the RS-LDC decoder 23 performs error correction and deinterleave processing.

  When reproducing the next-generation MD1 or next-generation MD2 disc, the selector 26 is selected on the A contact side, and the demodulated data is output as reproduction data from the disc 90.

  The tracking error signal TE and the focus error signal FE output from the RF amplifier 21 are supplied to the servo circuit 27, and the groove information is supplied to the ADIP demodulator 30.

  The ADIP demodulator 30 performs band limitation on the groove information by a bandpass filter to extract a wobble component, and then performs FM demodulation and biphase demodulation to demodulate the ADIP signal. The demodulated ADIP signal is supplied to the address decoder 32 and the address decoder 33.

  In the disk of the current MD system or the disk of the next generation MD1, the ADIP sector number is 8 bits as shown in FIG. On the other hand, in the next-generation MD2 system disk, as shown in FIG. 12, the ADIP sector number is 4 bits. The address decoder 32 decodes the ADIP address of the current MD or the next generation MD1. The address decoder 33 decodes the address of the next generation MD2.

  The ADIP address decoded by the address decoders 32 and 33 is supplied to the drive controller 31. The drive controller 31 executes a required control process based on the ADIP address. The groove information is supplied to the servo circuit 27 for spindle servo control.

  The servo circuit 27 generates a spindle error signal for CLV or CAV servo control, for example, based on an error signal obtained by integrating a phase error with a reproduction clock (PLL clock at the time of decoding) with respect to groove information. .

  Further, the servo circuit 27 performs various servo control signals (tracking control signals) based on a spindle error signal, a tracking error signal supplied from the RF amplifier 21, a focus error signal, a track jump command, an access command, etc. from the drive controller 31. , A focus control signal, a thread control signal, a spindle control signal, etc.) are generated and output to the motor driver 28. That is, various servo control signals are generated by performing necessary processing such as phase compensation processing, gain processing, and target value setting processing on the servo error signal and command.

  The motor driver 28 generates a required servo drive signal based on the servo control signal supplied from the servo circuit 27. The servo drive signal here includes a biaxial drive signal for driving the biaxial mechanism (two types of focus direction and tracking direction), a sled motor drive signal for driving the sled mechanism, and a spindle motor drive signal for driving the spindle motor 29. It becomes. By such servo drive signals, focus control and tracking control for the disk 90 and CLV or CAV control for the spindle motor 29 are performed.

  When recording audio data on the disc of the current MD system, the selector 16 is connected to the B contact, so that the ACIRC encoder 14 and the EFM modulator 15 function. In this case, the compressed data from the audio processing unit 10 is subjected to interleaving and error correction code addition by the ACIRC encoder 14 and then EFM modulation by the EFM modulation unit 15.

  The EFM modulation data is supplied to the magnetic head driver 17 via the selector 16, and the magnetic head 18 applies a magnetic field to the disk 90 based on the EFM modulation data, thereby recording an audio track.

  When data is recorded on the next-generation MD1 or next-generation MD2 disc, the selector 16 is connected to the A contact, so that the RS-LDC encoder 12 and the RLL (1-7) PP modulation unit 13 function. In this case, the high-density data from the memory transfer controller 3 is subjected to interleaving and RS-LDC error correction code addition by the RS-LDC encoder 12, and then RLL (1-7) PP modulation unit 13 performs RLL (1 -7) Modulation is performed.

  Then, recording data as an RLL (1-7) code string is supplied to the magnetic head driver 17 via the selector 16, and the magnetic head 18 applies a magnetic field to the disk 90 based on the modulation data, so that the data track is recorded. Recording is performed.

  The laser driver / APC 20 causes the laser diode to perform a laser emission operation during reproduction and recording as described above, but also performs a so-called APC (Automatic Laser Power Control) operation.

  That is, although not shown, a detector for laser power monitoring is provided in the optical head 19 and the monitor signal is fed back to the laser driver / APC 20. The laser driver / APC 20 compares the current laser power obtained as the monitor signal with the set laser power and reflects the error in the laser drive signal, so that the laser power output from the laser diode is , It is controlled to stabilize at the set value.

  As the laser power, values as reproduction laser power and recording laser power are set in a register in the laser driver / APC 20 by the drive controller 31.

  Based on an instruction from the system controller 9, the drive controller 31 performs control so that the above operations (access, various servos, data writing, and data reading operations) are executed.

  In FIG. 18, the A part and the B part surrounded by the alternate long and short dash line can be configured as a one-chip circuit part, for example.

5. About the initialization process of the disk by the next generation MD1 and the next generation MD2 As described above, the UID (unique ID) is recorded outside the FAT on the disk by the next generation MD1 and the next generation MD2, and the recorded UID is used. Security management. In principle, discs compatible with the next generation MD1 and the next generation MD2 are shipped with a UID recorded in advance on a predetermined position on the disc. In the disc corresponding to the next generation MD1, the UID is recorded in advance in the lead-in area, for example. In this case, the position where the UID is recorded in advance is not limited to the lead-in area. For example, if the position where the UID is written after initialization of the disk is fixed, it can be recorded in advance at that position. In the disc corresponding to the next generation MD2 and the next generation MD1.5, the UID is recorded in advance in the BCA described above.

  On the other hand, a disk based on the current MD system can be used as the disk based on the next generation MD1. For this reason, a number of discs based on the current MD system that have already been circulated without being recorded are used as discs for the next generation MD1.

  Therefore, an area that is protected by the standard is provided for a disk according to the current MD system that has been circulated without recording a UID, and the disk drive device 1 is provided in the area when the disk is initialized. The random number signal is recorded at, and this is used as the UID of the disc. Also, it is prohibited by the standard that the user accesses the area where this UID is recorded. The UID is not limited to a random number signal. For example, a manufacturer code, a device code, a device serial number, and a random number can be combined and used as a UID. Furthermore, any one or more of a manufacturer code, a device code, and a device serial number and a random number can be combined and used as a UID.

  FIG. 19 is a flowchart showing an example of initialization processing of a disk by the next generation MD1. In a first step S100, a predetermined position on the disc is accessed and it is confirmed whether a UID is recorded. If it is determined that the UID is recorded, the UID is read out and temporarily stored in the auxiliary memory 5, for example.

  The position accessed in step S100 is outside the FAT area of the format by the next generation MD1 system, such as the lead-in area. If the disk 90 is already provided with a DDT, such as a disk that has been initialized in the past, the area may be accessed. Note that the process of step S100 can be omitted.

  Next, in step S101, the U-TOC is recorded by EFM modulation. At this time, information for ensuring an alert track and a track after the DDT in FIG. 2, that is, an area where data is modulated and recorded by 1-7pp modulation is written to the U-TOC. In the next step S102, an alert track is recorded by EFM modulation in the area secured by the U-TOC in step S101. In step S103, DDT is recorded by 1-7pp modulation.

  In step S104, the UID is recorded in an area outside the FAT, for example, the DDT. If the UID is read from a predetermined position on the disk and stored in the auxiliary memory 5 in step S100 described above, the UID is recorded. If it is determined in step S100 that no UID is recorded at a predetermined position on the disc, or if step S100 is omitted, a UID is generated based on the random number signal. This generated UID is recorded. The UID is generated by, for example, the system controller 9, and the generated UID is supplied to the media drive 2 via the memory transfer controller 3 and recorded on the disk 90.

  Next, in step S105, data such as FAT is recorded in an area where data is modulated by 1-7pp modulation and recorded. That is, the area where the UID is recorded is an area outside the FAT. Further, as described above, in the next generation MD1, initialization of the recordable area to be managed by the FAT is not necessarily required.

  FIG. 20 is a flowchart showing an example of initialization processing of a disc by the next generation MD2 and the next generation MD1.5. In the first step S110, an area corresponding to the BCA on the disc is accessed to check whether a UID is recorded. If it is determined that the UID is recorded, the UID is read out and temporarily stored in the auxiliary memory 5, for example. Since the recording position of the UID is fixedly determined on the format, it can be directly accessed without referring to other management information on the disc. This can also be applied to the processing described with reference to FIG.

  In the next step S111, the DDT is recorded by 1-7pp modulation. Next, in step S112, the UID is recorded in an area outside the FAT, for example, DDT. As the UID recorded at this time, the UID read from the predetermined position on the disk and stored in the auxiliary memory 5 in step S110 is used. If it is determined in step S110 described above that no UID is recorded at a predetermined position on the disc, a UID is generated based on the random number signal, and the generated UID is recorded. The UID is generated by, for example, the system controller 9, and the generated UID is supplied to the media drive 2 via the memory transfer controller 3 and recorded on the disk 90.

  In step S113, FAT or the like is recorded. That is, the area where the UID is recorded is an area outside the FAT. Further, as described above, in the next generation MD2, initialization of the recordable area to be managed by the FAT is not performed.

6). Regarding the first management system for music data As described above, in the next-generation MD1 and next-generation MD2 systems to which the present invention is applied, the data is managed by the FAT system. The audio data to be recorded is compressed by a desired compression method and encrypted to protect the rights of the author. As a method for compressing audio data, for example, it is considered to use ATRAC3, ATRAC5, or the like. Of course, other compression methods such as MP3 (MPEG1 Audio Layer-3) and AAC (MPEG2 Advanced Audio Coding) can be used. Further, not only audio data but also still image data and moving image data can be handled. Of course, since the FAT system is used, general-purpose data can be recorded and reproduced. In addition, computer readable and executable instructions can be encoded on the disk, so that the next generation MD1 or next generation MD2 can also contain executable files.

  A management method for recording / reproducing audio data on / from a disc having the specifications of the next generation MD1 and the next generation MD2 will be described.

  In the next-generation MD1 system and the next-generation MD2 system, music data with high sound quality can be played back for a long time, so the number of music pieces managed on one disc is enormous. Moreover, the compatibility with a computer is achieved by managing using a FAT system. According to the recognition of the inventor of the present application, there is a merit that the usability can be improved, but the music data is illegally copied and there is a possibility that the copyright holder cannot be protected. In the management system to which the present invention is applied, consideration is given to such points.

  FIG. 21 is a first example of an audio data management method. As shown in FIG. 21, in the management method in the first example, a track index file and an audio data file are generated on the disc. The track index file and the audio data file are files managed by the FAT system.

  As shown in FIG. 22, the audio data file is a file in which a plurality of music data is stored as one file. When the audio data file is viewed with the FAT system, it looks like a huge file. The audio data file is partitioned as parts, and the audio data is handled as a set of parts.

  The track index file is a file in which various information for managing music data stored in the audio data file is described. As shown in FIG. 23, the track index file includes a play order table, a programmed play order table, a group information table, a track information table, a parts information table, and a name table.

  The play order table is a table indicating the playback order defined by default. As shown in FIG. 24, the play order table stores information TINF1, TINF2,... Indicating the link destination to the track descriptor (FIG. 27) of the track information table for each track number (song number). The track number is a continuous number starting from “1”, for example.

  The programmed play order table is a table in which each user defines a playback procedure. In the programmed play order table, as shown in FIG. 25, information track information PINF1, PINF2,... Linked to the track descriptor for each track number is described.

  In the group information table, information about groups is described as shown in FIG. A group is a set of one or more tracks having a continuous track number, or a set of one or more tracks having a continuous programmed track number. As shown in FIG. 26A, the group information table is described by the group descriptor of each group. In the group descriptor, as shown in FIG. 26B, the track number at which the group starts, the number of the end track, the group name, and the flag are described.

  As shown in FIG. 27, the track information table describes information about each song. As shown in FIG. 27A, the track information table includes track descriptors for each track (each music piece). As shown in FIG. 27B, each track descriptor includes an encoding method, copyright management information, content decryption key information, pointer information to a part number as an entry at which the music starts, artist name, title name, original Song order information, recording time information, etc. are described. The artist name and title name describe pointer information to the name table, not the name itself. The encoding method indicates a codec method and becomes decoding information.

  As shown in FIG. 28, the part information table describes a pointer for accessing the actual music position from the part number. As shown in FIG. 28A, the part information table is composed of part descriptors for each part. Parts are all parts of one track (music) or each part obtained by dividing one track. FIG. 28B shows an entry of a part descriptor in the part information table. As shown in FIG. 28B, each part descriptor describes the head address of the part in the audio data file, the end address of the part, and the link destination to the part that follows the part.

  The addresses used as part number pointer information, name table pointer information, and pointer information indicating the position of the audio file include the byte offset of the file, the part descriptor number, the FAT cluster number, and the physical of the disk used as the recording medium. An address or the like can be used. File byte offset is a specific embodiment of the offset method that can be implemented in the present invention. Here, the part pointer information is an offset value from the start of the audio file, and the value is expressed in a predetermined unit (for example, a block of bytes, bits, and n bits).

  The name table is a table for representing characters that are names of names. As shown in FIG. 29A, the name table includes a plurality of name slots. Each name slot is called by being linked from each pointer indicating a name. The pointer for calling the name includes the artist name and title name of the track information table, the group name of the group information table, and the like. Each name slot can be called from a plurality. As shown in FIG. 29B, each name slot includes name data that is character information, a name type that is an attribute of the character information, and a link destination. A long name that does not fit in one name slot can be described by being divided into a plurality of name slots. If one name slot does not fit, the link destination to the name slot in which the subsequent name is described is described.

  In the first example of the audio data management system in the system to which the present invention is applied, as shown in FIG. 30, when the track number to be reproduced is designated by the play order table (FIG. 24), The link destination track descriptor (FIG. 27) is read out, and from this track descriptor, the encoding method, copyright management information, content decryption key information, pointer information to the part number where the music starts, artist name and title A name pointer, original music order information, recording time information, and the like are read out.

  The part number information read from the track information table is linked to the part information table (FIG. 28). From this part information table, the audio data file of the part position corresponding to the start position of the track (music) is obtained. Accessed. When the data of the part at the position specified in the part information table of the audio data file is accessed, the reproduction of the audio data is started from that position. At this time, decoding is performed based on the encoding method read from the track descriptor of the track information table. If the audio data is encrypted, the key information read from the track descriptor is used.

  When there is a part that follows the part, a part descriptor is described as the link destination of the part, and the part descriptor is sequentially read according to the link destination. By following the link destination of this part descriptor and playing the audio data of the part at the position specified by the part descriptor on the audio data file, the audio data of the desired track (song) is recorded. Can be played.

  Also, the name table name slot (FIG. 29) at the position (name pointer information) pointed to by the artist name or title name pointer read from the track information table is called, and from the name slot at that position, Name data is read. The name pointer information may be, for example, a name slot number, a cluster number in the FAT system, or a physical address of the recording medium.

  As described above, a plurality of name slots in the name table can be referred to. For example, there may be a case where a plurality of music pieces of the same artist are recorded. In this case, as shown in FIG. 31, the same name table is referred to as an artist name from a plurality of track information tables. In the example of FIG. 31, the track descriptor “1”, the track descriptor “2”, and the track descriptor “4” are all music pieces of the same artist “DEF BAND” and refer to the same name slot as the artist name. . Also, the track descriptor “3”, the track descriptor “5”, and the track descriptor “6” are all the music of the artist “GHQ GIRLS” at the same position, and refer to the same name slot as the artist name. Thus, if the name slot of the name table can be referred to from a plurality of pointers, the capacity of the name table can be saved.

  Along with this, for example, a link to this name table can be used to display information of the same artist name. For example, when it is desired to display a list of songs whose artist name is “DEF BAND”, the track descriptor referring to the address of the name slot of “DEF BAND” is traced. In this example, the track descriptor “1”, the track descriptor “2”, and the track descriptor “4” are obtained by tracing the track descriptor referring to the address of the name slot “DEF BAND”. This makes it possible to display a list of songs whose artist name is “DEF BAND” among the songs stored on the disc. Since a plurality of name tables can be referred to, no link is provided to reversely follow the track information table from the name table.

  In the case of newly recording audio data, a FAT table provides an unused area that is continuous with a desired number of recording blocks or more, for example, four recording blocks or more. The reason why a continuous area of a desired recording block or more is ensured is that there is no waste in access if audio data is recorded in a continuous area as much as possible.

  When an area for recording audio data is prepared, one new track descriptor is allocated on the track information table, and a content key for encrypting the audio data is generated. Then, the input audio data is encrypted, and the encrypted audio data is recorded in the prepared unused area. The area where the audio data is recorded is connected to the end of the audio data file on the FAT file system.

  As new audio data is linked to the audio data file, the linked position information is created, and the newly created audio data position information is recorded in the newly reserved parts description. The Then, key information and part numbers are described in the newly secured track descriptor. Further, if necessary, an artist name, a title name, and the like are described in the name slot, and a pointer linked to the artist name and the title name is described in the name slot in the track descriptor. Then, the number of the track descriptor is registered in the play order table. Also, copyright management information is updated.

  When reproducing audio data, information corresponding to the designated track number is obtained from the play order table, and the track descriptor of the track to be reproduced is obtained.

  Key information is acquired from the track descriptor in the track information table, and a part description indicating an area in which entry data is stored is acquired. From the part description, the position on the first audio data file of the part in which the desired audio data is stored is acquired, and the data stored at the position is extracted. Then, the data reproduced from that position is decrypted using the acquired key information, and the audio data is reproduced. If there is a link in the part description, it is specified and linked to the part, and the same procedure is repeated.

  When a song having a track number “n” on the play order table is changed to a track number “n + m”, the track information in which the track information is described is recorded from the track information TINFn in the play order table. A scripter Dn is obtained. All the values (track descriptor number) of the track information TINFn + 1 to TINFn + m are moved to the previous one. The number of the track descriptor Dn is stored in the track information TINFn + m.

  When deleting a music piece having a track number “n” in the play order table, the track descriptor Dn in which the information of the track is described is obtained from the track information TINFn in the play order table. All valid track descriptor numbers after the track information entry TINFn + 1 in the play order table are moved to the previous one. Further, since the track “n” is to be deleted, all the track information entries after the track “n” are moved forward by one in the play order table. A part descriptor indicating an area in which an encoding method and a decryption key corresponding to the track are acquired from the track descriptor Dn acquired when the track is erased, and the head music data is stored. The number of Pn is acquired. The audio block in the range specified by the part descriptor Pn is separated from the audio data file on the FAT file system. Further, the track descriptor Dn of the track in the track information table is deleted. Then, the part descriptor is deleted from the part information table, and the part description is released by the file system.

  For example, in FIG. 32A, parts A, B, and C are connected so far, and part B is deleted from them. Suppose that part A and part B share the same audio block (and share the same FAT cluster), and the FAT chain is continuous. The part C is located immediately after the part B in the audio data file, but when the FAT table is examined, it is assumed that the part C is actually located at a distance.

  In the case of this example, as shown in FIG. 32B, when part B is deleted, it can be actually removed from the FAT chain (returned to a free area), and the cluster is not shared with the current part. There are two FAT clusters. That is, the audio data file is shortened to 4 audio blocks. The numbers of the audio blocks recorded in part C and the parts after it are all reduced by 4.

  It should be noted that the deletion can be performed on a part of the track instead of the entire track. When a part of the track is deleted, the remaining track information can be decrypted by using the encoding method and decryption key corresponding to the track acquired from the part descriptor Pn in the track information table. It is.

  When connecting the track n and the track n + 1 on the play order table, the track descriptor number Dn describing the information of the track is obtained from the track information TINFn in the play order table. Further, the track descriptor number Dm describing the information of the track is obtained from the track information TINFn + 1 in the play order table. All valid TINF values (track descriptor numbers) after TINFn + 1 in the play order table are moved to the previous TINF. By searching the programmed play order table, all the tracks referring to the track descriptor Dm are deleted. A new encryption key is generated, a part descriptor list is extracted from the track descriptor Dn, and the part descriptor list extracted from the track descriptor Dm is connected to the tail of the part descriptor list.

  When connecting tracks, compare both track descriptors to confirm that there is no problem with copyright management, obtain a parts descriptor from the track descriptor, and if both tracks are connected, there is a provision for fragments. It is necessary to confirm whether it is satisfied with the FAT table. Further, it is necessary to update the pointer to the name table as necessary.

  When the track n is divided into the track n and the track n + 1, the track descriptor number Dn in which the information of the track is described is acquired from the TINFn in the play order table. From the track information TINFn + 1 in the play order table, the track descriptor number Dm describing the information of the track is acquired. Then, all valid track information TINF values (track descriptor numbers) after TINFn + 1 in the play order table are moved to the next one. A new key is generated for the track descriptor Dn. A list of parts descriptors is extracted from the track descriptor Dn. A new part descriptor is assigned, and the contents of the part descriptor before division are copied there. The part descriptor including the dividing point is shortened immediately before the dividing point. In addition, the link of the part descriptor after the dividing point is cut off. A new part descriptor is set immediately after the dividing point.

7. Second Example of Music Data Management Method Next, a second example of the audio data management method will be described. FIG. 33 shows a second example of the audio data management system. As shown in FIG. 33, in the management method in the second example, a track index file and a plurality of audio data files are generated on the disc. The track index file and the plurality of audio data files are files managed by the FAT system.

  As shown in FIG. 34, the audio data file is basically one in which music data of one file is stored. This audio data file has a header. In the header, a title, decryption key information, and copyright management information are recorded, and index information is provided. An index divides music of one track into a plurality of pieces. In the header, the position of each track divided by the index is recorded corresponding to the index number. For example, 255 indexes can be set.

  The track index file is a file in which various information for managing music data stored in the audio data file is described. As shown in FIG. 35, the track index file includes a play order table, a programmed play order table, a group information table, a track information table, and a name table.

  The play order table is a table indicating the playback order defined by default. As shown in FIG. 36, the play order table stores information TINF1, TINF2,... Indicating the link destination to the track descriptor (FIG. 39) of the track information table for each track number (song number). The track number is a continuous number starting from “1”, for example.

  The programmed play order table is a table in which each user defines a playback procedure. In the programmed play order table, as shown in FIG. 37, information track information PINF1, PINF2,... Linked to the track descriptor for each track number is described.

  In the group information table, information about groups is described as shown in FIG. A group is a set of one or more tracks having a continuous track number, or a set of one or more tracks having a continuous programmed track number. As shown in FIG. 38A, the group information table is described by the group descriptor of each group. In the group descriptor, as shown in FIG. 38B, a track number at which the group starts, an end track number, a group name, and a flag are described.

  As shown in FIG. 39, the track information table describes information about each song. As shown in FIG. 39A, the track information table includes track descriptors for each track (each song). In each track descriptor, as shown in FIG. 39B, the file pointer, index number, artist name, title name, original song order information, recording time information, etc. of the audio data file containing the song are described. Yes. The artist name and title name are not the name itself but a pointer to the name table.

  The name table is a table for representing characters that are names of names. As shown in FIG. 40A, the name table includes a plurality of name slots. Each name slot is called by being linked from each pointer indicating a name. The pointer for calling the name includes the artist name and title name of the track information table, the group name of the group information table, and the like. Each name slot can be called from a plurality. Each name slot includes name data, a name type, and a link destination, as shown in FIG. 40B. A long name that does not fit in one name slot can be described by being divided into a plurality of name slots. If one name slot does not fit, the link destination to the name slot in which the subsequent name is described is described.

  In the second example of the audio data management method, as shown in FIG. 41, when the track number to be reproduced is designated by the play order table (FIG. 36), the track descriptor (FIG. 39) linked to the track information table is designated. ) And the file pointer and index number of the music, the pointer of the artist name and title name, the original music order information, the recording time information, and the like are read from the track descriptor.

  The audio data file is accessed from the pointer of the music file, and the header information of the audio data file is read. If the audio data is encrypted, the key information read from the header is used. Then, the audio data file is reproduced. At this time, if an index number is designated, the position of the designated index number is detected from the header information, and reproduction is started from the position of the index number.

  Further, the name slot of the name table at the position indicated by the pointer of the artist name or title name read from the track information table is called, and the name data is read from the name slot at that position.

  In the case of newly recording audio data, a FAT table provides an unused area that is continuous with a desired number of recording blocks or more, for example, four recording blocks or more.

  When an area for recording audio data is prepared, one new track descriptor is assigned to the track information table, and a content key for encrypting the audio data is generated. Then, the input audio data is encrypted, and an audio data file is generated.

  In the newly secured track descriptor, the file pointer and key information of the newly generated audio data file are described. Further, if necessary, an artist name, a title name, and the like are described in the name slot, and a pointer linked to the artist name and the title name is described in the name slot in the track descriptor. Then, the number of the track descriptor is registered in the play order table. Also, copyright management information is updated.

  When reproducing audio data, information corresponding to the designated track number is obtained from the play order table, and the track descriptor of the track to be reproduced in the track information table is obtained.

  From the track descriptor, the file pointer and index number of the audio data storing the music data are acquired. Then, the audio data file is accessed, and key information is obtained from the header of the file. Then, the data of the audio data file is decrypted using the acquired key information, and the audio data is reproduced. When the index number is designated, reproduction is started from the position of the designated index number.

  When the track n is divided into the track n and the track n + 1, the track descriptor number Dn in which the information of the track is described is acquired from the TINFn in the play order table. From the track information TINFn + 1 in the play order table, the track descriptor number Dm describing the information of the track is acquired. Then, all valid track information TINF values (track descriptor numbers) after TINFn + 1 in the play order table are moved to the next one.

  As shown in FIG. 42, by using the index, the data of one file is divided into a plurality of index areas. The index number and the position of the index area are recorded in the header of the audio track file. In the track descriptor Dn, a file pointer of audio data and an index number are described. A file pointer and an index number of audio data are described in the track descriptor Dm. Thereby, the music M1 of one track of the audio file is apparently divided into the music M11 and M12 of two tracks.

  When connecting the track n and the track n + 1 on the play order table, the track descriptor number Dn describing the information of the track is obtained from the track information TINFn in the play order table. Further, the track descriptor number Dm describing the information of the track is obtained from the track information TINFn + 1 in the play order table. All valid TINF values (track descriptor numbers) after TINFn + 1 in the play order table are moved to the previous one.

  Here, when the track n and the track n + 1 are in the same audio data file and are divided by the index, as shown in FIG. 43, the index information in the header can be deleted to connect them. is there. Thereby, the music M21 and M22 of two tracks are connected to the music M23 of one track.

  If track n is the latter half of one audio data file divided by index and track n + 1 is at the head of another audio data file, the data of track n divided by index as shown in FIG. Is added to the audio data file of the music M32. Then, the header of the audio data file of the track n + 1 is removed, and the audio data of the track n + 1 of the music M41 is connected. Thereby, the music M32 and M41 of two tracks are connected as the music M51 of one track.

  In order to realize the above processing, a function for converting the audio data by the index into one audio data file by adding a header to the track divided by the index and encrypting it with another encryption key; Except for the header of the audio data file, it has a function of linking to other audio data files.

8). Operation at the time of connection with a personal computer The next generation MD1 and the next generation MD2 employ a FAT system as a data management system in order to have compatibility with a personal computer. Therefore, the next-generation MD1 and next-generation MD2 discs support not only audio data but also data reading and writing generally handled by personal computers.

  Here, in the disk drive device 1, the audio data is reproduced while being read from the disk 90. Therefore, in consideration of the accessibility of the portable disk drive device 1 in particular, it is preferable that a series of audio data is continuously recorded on the disk. On the other hand, general data writing by a personal computer is performed by appropriately allocating free areas on the disk without considering such continuity.

  Therefore, in the recording / reproducing apparatus to which the present invention is applied, when the personal computer 100 and the disk drive apparatus 1 are connected by the USB hub 7 and writing is performed from the personal computer 100 to the disk 90 attached to the disk drive apparatus 1. The general data writing is performed under the management of the file system on the personal computer side, and the audio data writing is performed under the management of the file system on the disk drive apparatus 1 side.

  FIG. 45 is a diagram for explaining that the management authority is moved according to the type of data to be written in a state where the personal computer 100 and the disk drive device 1 are connected by the USB hub 7 (not shown). FIG. 45A shows an example in which general data is transferred from the personal computer 100 to the disk drive device 1 and recorded on the disk 90 attached to the disk drive device 1. In this case, FAT management on the disk 90 is performed by the file system on the personal computer 100 side.

  It is assumed that the disk 90 is a disk formatted by either the next generation MD1 or the next generation MD2.

  That is, on the personal computer 100 side, the connected disk drive device 1 looks like a single removable disk managed by the personal computer 100. Therefore, for example, data can be read from and written to the disk 90 mounted on the disk drive device 1 so that the personal computer 100 reads and writes data from and to the flexible disk.

  Such a file system on the personal computer 100 side can be provided as a function of an OS (Operating System) that is basic software installed in the personal computer 100. As is well known, the OS is recorded as a predetermined program file, for example, in a hard disk drive of the personal computer 100. The program file is read when the personal computer 100 is started and is executed in a predetermined manner, so that each function as an OS can be provided.

  FIG. 45B shows an example in which audio data is transferred from the personal computer 100 to the disk drive device 1 and recorded on the disk 90 attached to the disk drive device 1. For example, in the personal computer 100, audio data is recorded on a recording medium such as a hard disk drive (hereinafter referred to as HDD) included in the personal computer 100.

  The personal computer 100 requests the disk drive device 1 to write audio data to the loaded disk 90 and delete the audio data recorded on the disk 90 while performing ATRAC compression encoding on the audio data. It is assumed that utility software is installed. The utility software further has a function of browsing the track information recorded on the disk 90 by referring to the track index file of the disk 90 mounted on the disk drive device 1. The utility software is recorded as a program file in the HDD of the personal computer 100, for example.

  As an example, a case where audio data recorded on a recording medium of the personal computer 100 is recorded on a disk 90 attached to the disk drive device 1 will be described. It is assumed that the above-described utility software has been activated in advance.

  First, the user operates the personal computer 100 to record predetermined audio data (referred to as audio data A) recorded on the HDD onto the disk 90 mounted on the disk drive device 1. Based on this operation, a write request command for requesting recording of the audio data A on the disk 90 is output by the utility software. The write request command is transmitted from the personal computer 100 to the disk drive device 1.

  Subsequently, audio data A is read from the HDD of the personal computer 100. The read audio data A is subjected to ATRAC compression / encoding processing by the above-described utility software installed in the personal computer 100 and converted into ATRAC compressed data. The audio data A converted into the ATRAC compressed data is transferred from the personal computer 100 to the disk drive device 1.

  On the disk drive device 1 side, when the write request command transmitted from the personal computer is received, the audio data A converted into the ATRAC compressed data is transferred from the personal computer 100, and the transferred data is audio. It is recognized that data is recorded on the disk 90 as data.

  In the disk drive device 1, the audio data A transmitted from the personal computer 100 is received from the USB hub 7 and sent to the media drive unit 2 via the USB interface 6 and the memory transfer controller 3. The system controller 9 controls the audio data A to be written to the disk 90 based on the FAT management method of the disk drive device 1 when the audio data A is sent to the media drive unit 2. That is, the audio data A is continuously written in units of recording blocks based on the FAT system of the disk drive device 1 with 4 recording blocks, that is, 64 kbytes × 4 as the minimum recording length.

  Until data writing to the disk 90 is completed, data, status, and commands are exchanged between the personal computer 100 and the disk drive apparatus 1 using a predetermined protocol. As a result, for example, the data transfer speed is controlled so that the overflow or underflow of the cluster buffer 4 does not occur on the disk drive device 1 side.

  Examples of commands that can be used on the personal computer 100 side include a delete request command in addition to the write request command described above. This deletion request command is a command for requesting the disk drive apparatus 1 to delete the audio data recorded on the disk 90 mounted on the disk drive apparatus 1.

  For example, when the personal computer 100 and the disk drive device 1 are connected and the disk 90 is loaded into the disk drive device 1, the track index file on the disk 90 is read by the above-described utility software, and the read data Is transmitted from the disk drive device 1 to the personal computer 100. In the personal computer, based on this data, for example, a list of titles of audio data recorded on the disc 90 can be displayed.

  When the personal computer 100 tries to delete certain audio data (referred to as audio data B) based on the displayed title list, information indicating the audio data B to be deleted is transmitted to the disk drive device 1 together with the delete request command. Is done. When the disk drive apparatus 1 receives this deletion request command, the requested audio data B is deleted from the disk 90 based on the control of the disk drive apparatus 1 itself.

  Since deletion of audio data is performed by control based on the FAT system of the disk drive device 1 itself, for example, as described with reference to FIGS. 32A and 32B, in a huge file in which a plurality of audio data is collected as one file It is also possible to perform processing such as deleting audio data with a certain size.

9. Memory Control Method Next, a memory control method according to the first embodiment of the present invention will be described. In the first embodiment, data write processing on the disk 90 is performed by the FAT system of the disk drive device 1 itself. FIG. 46 shows a transfer path of data read / written on the disk 90 in FIG. 17 described above. In FIG. 46, parts common to those in FIG. 17 described above are denoted by the same reference numerals and detailed description thereof is omitted. Further, the USB hub 7 for connecting the personal computer (PC) 100 and the media drive unit 2 for driving the disk 90 are omitted.

  As already described in the above section “3. Recording Format”, the disk 90 has one cluster and 64 kB as a recording / reproducing access unit. Therefore, data is transferred between the disk 90 and the memory transfer controller 3 in units of 64 kB (= recording block units). Here, the cluster unit address of the disk 90 is referred to as LCN (Logical Cluster Number), and the sector unit address is referred to as LSN (Logical Sector Number). The memory transfer controller 3 accesses the disk 90 in units of LCN.

  On the other hand, data transfer is performed between the PC 100 and the memory transfer controller 3 in units of 2 kB, which is one sector of the FAT system according to this embodiment, via the USB I / F 6. Here, the sector unit address of the FAT system is referred to as FSN (FAT Sector Number).

  The cluster buffer memory 4 is composed of a DRAM (Dynamic Random Access Memory). Hereinafter, the cluster buffer memory 4 is appropriately referred to as DRAM 4. The DRAM 4 also serves as a cache memory for the disk 90. The DRAM 4 is managed as a disk image in cluster units. In the DRAM 4, the memory space is managed every 64 kB, and an address is assigned every 2 kB. The DRAM 4 can read and write every 2 kB based on this address. That is, the DRAM 4 can perform writing and reading in units of FAT sectors (FSN), and can perform reading and writing in units of clusters (LCN) with respect to the disk 90. The address of every 2 kB of the DRAM 4 corresponds to the LSN of the disk 90.

  Hereinafter, for the sake of convenience, the FAT sector unit area in the DRAM 4 is referred to as a DRAM sector.

  Further, the above-described FSN and LCN undergo one-to-one address conversion. For example, when the data read from the disk 90 is written to the DRAM 4 and the LCN is assigned to the DRAM 4, a correspondence table that can associate the FSN and the LCN is created. The correspondence table is stored in, for example, the RAM 9A included in the system controller 9.

  FIG. 47 shows an example of this correspondence table. In FIG. 47, the DRAM address and the LCN address are each represented in hexadecimal notation, and the DRAM address is a value counted up by one for each DRAM sector. LCN is a value counted up for each cluster. One LCN and 32 sector fill bits are associated with 32 DRAM addresses.

  The sector fill bit indicates in which DRAM sector in the LCN valid data is written. That is, data written to the disk 90 is once buffered in the DRAM 4. As described above, the DRAM 4 can be accessed in units of FAT sectors. For example, when non-continuous data is supplied from the PC 100, as shown in FIG. It is conceivable that data is written in a DRAM sector arbitrarily allocated on the PC 100 side. Therefore, a DRAM sector (indicated by hatching in FIG. 48) in which valid data is written is set to, for example, “1”, and a DRAM sector in which valid data is not written is set to “0” to form a 32-bit sector fill bit.

  The disk 90 is accessed by designating the FSN and data length (LENG) from the PC 100. When (FSN, LENG) is converted by a predetermined conversion formula, LCN and sector fill bit are obtained. For example, it is assumed that (FSN, LENG) designated by access from the PC 100 is converted, and LCN = 104h and sector fill bit = 7 are obtained. In this case, the cluster of LCN = 104h is reproduced from the disk 90 and written to the DRAM 4, and the data of the DRAM sector corresponding to the seventh sector fill bit is taken out from the DRAM 4.

  FIG. 49 is a sequence chart showing an example of a basic sequence when data is written from the PC 100 to the disk 90. In the figure, the USB task is data transfer processing by the USB I / F 6. The cache task is control of writing and reading with respect to the DRAM 4 by the memory transfer controller 3. The drive task is a recording / reproduction control of the disk 90 by the media drive unit 2.

  The PC 100 designates FSN and LENG for the disk 90, and issues a write request for requesting data recording (SEQ100). This write request is passed to the cache task via the USB task (SEQ101). The cache task converts the received (FSN, LENG) by a predetermined conversion formula to obtain the LCN and sector fill bit, and assigns an address to the DRAM 4 (step S300). The DRAM address, LCN, and sector fill bit are registered in the correspondence table described above.

  When address assignment to the DRAM 4 is performed, the assigned DRAM address is notified from the cache task to the USB task (SEQ102). The USB task that has received this notification notifies the PC 100 that the preparation for writing has been completed via the USB I / F 6 (SEQ103). In response to this notification, data is transferred from the PC 100 to the USB I / F 6 in units of 64 B (bytes), for example (SEQ104). The transferred data is stored in a buffer (not shown) of the USB I / F 6.

  The USB task monitors the buffer of the USB I / F 6 and transfers the data stored in the buffer to the DRAM 4 in units of 2 kbytes (SEQ105). The cache task writes the transferred data to the DRAM 4 in units of DRAM sectors based on the correspondence table (step S301). When the data transfer from the PC 100 is completed, the USB task notifies the cache task that the transfer of data to be written to the disk 90 has been completed (SEQ106).

  Thereafter, LCN, LSN (sector fill bit), and LENG are designated from the cache task to the drive task, and a write request is issued to write the data written in the DRAM 4 to the disk 90 (SEQ107). Based on the received write request, the drive task writes the data transferred from the DRAM 4 in units of 64 kbytes to the disk 90 in units of LCN (step S302). When the writing to the disk 90 is completed, the drive task notifies the cache task (SEQ108).

  Here, consider the case of handling continuous data such as audio data. When handling continuous data, it is convenient to use the DRAM 4 as a ring buffer for accessing addresses cyclically. In the ring buffer, the address is continuously written to the data continuously supplied, and when the writing is performed up to the maximum address, the old data is overwritten from the lowest address as if the addresses are continuous in a ring shape. However, data writing is continued.

  On the other hand, since the disk 90 can be accessed only in cluster units, when data on the DRAM 4 is written into the disk 90 in DRAM sector units, it is necessary to write to the entire cluster including the LSN corresponding to the DRAM sector. Therefore, as shown in an example in FIG. 50, when data on the DRAM 4 is written to the disk 90, together with the data to be written, the DRAM sector on the DRAM 4 that is a fraction of the cluster is written to the disk 90. There is a risk of overwriting.

  In the first embodiment of the present invention, a work DRAM that can be accessed independently of the above-described 64 kB management area on the DRAM 4 is used, and a DRAM sector that is a fraction of one cluster on the DRAM 4 is supported. Data of one cluster on the disk 90 including the sector thus written is temporarily written in the work DRAM. Then, the DRAM 4 is accessed in units of DRAM sectors, and a DRAM sector that is a fraction of one cluster is written to a corresponding address on the work RAM. Then, by writing the data of the work RAM on the disk 90 in units of clusters, the sector (LSN) unit for the disk 90 is avoided while avoiding overwriting of the DRAM sector, which is a fraction of the cluster, to the disk 90 as described above. Data writing is realized.

  The work DRAM can be accessed in units of DRAM sectors. As the work RAM, the RAM 9A included in the system controller 9 can be used. A work RAM area may be provided in the DRAM 4 as an area different from the management area for every 64 kB. Of course, a work RAM can be provided independently. In this case, the work RAM is connected to the memory transfer controller 3, for example. Control of reading and writing data in the work RAM is performed by the system controller 9 and the memory transfer controller 3.

  FIG. 51 shows a procedure for copying between DRAMs according to the first embodiment of the present invention. 51A corresponds to the addresses of the DRAM 4 and the disk 90, and the block n corresponds to a management area of 64 kB units in the DRAM 4 and an LCN in the disk 90. On the other hand, the work RAM addresses shown in FIGS. 51A and 51D are not related. As shown in FIG. 51C, description will be made by taking as an example a process of writing data (2) on DRAM 4 shown in FIG. 51B from the LSN next to data (1) to the disc 90 on which data (1) has already been recorded. To do.

  In FIG. 51B, data (3) is data to be written to the DRAM 4 from now on. Since there is a possibility that valid data is written in the area corresponding to the data (3) on the disk 90, it is not allowed to destroy the data of the part on the disk 90. In the first embodiment, this processing is performed by the FAT system of the disk drive device 1 itself, and the data access processing by the FAT system of the disk drive device 1 itself is called a file task.

  First, FSN and LENG are specified by the file task, and a write request is issued to the cache task. Based on this write request, FSN and LCN conversion processing, correspondence table creation / registration, address assignment processing to the DRAM 4 and the like are performed in the same manner as described above with reference to FIG. Then, a request for reading the first cluster (block 2 in the example of FIG. 51) including the data requested to be written by the file task is issued from the disk 90 to the drive task from the cache task. Data read from the disk 90 based on this request is written to the work DRAM (SEQ200).

  The cache task refers to the correspondence table based on the FSN and LENG passed from the file task, and selects the DRAM sector that is a fraction of the 64 kB management area at the head of the data (2) written in the DRAM 4. Then, the work DRAM is overwritten and copied to the address corresponding to the position of the cluster written in SEQ200 (SEQ201). Thereafter, the data copied by SEQ200 and SEQ201 on the work RAM is overwritten in the cluster corresponding to block 2 of the disk 90 by the drive task (SEQ202).

  Next, based on the correspondence table, the data (2) on the DRAM 4 is read from the next address read out in the above-described SEQ 201 and the fractional part in 64 kB units is read out, and the corresponding cluster of the disk 90 is read out. (SEQ203). In this example, the data of the part corresponding to the blocks 3 and 4 of the DRAM 4 is read and written to the disk 90.

  Next, the cluster (block 5) next to the cluster written in SEQ203 is read from the disk 90 and written in the work DRAM (SEQ204). Immediately thereafter, based on the FSN and LENG passed from the file task, the cache task reads the data (2) in the block 5 in the DRAM 4 in units of DRAM sectors and is overwritten and copied to the work RAM. Then, similarly to SEQ202 described above, the data for one cluster written in the work DRAM is written in the corresponding LCN (block 5 in this example) of the disk 90.

  In this way, the data (2) is written to the data (1) already written on the disk 90 with continuous addresses in units of sectors, and data is written to the disks 90 in units of sectors.

  Next, a second embodiment of the present invention will be described. In the second embodiment, data writing processing on the disk 90 is performed based on the FAT system on the PC 100 side. In the description of the second embodiment, data access processing by the FAT system on the PC 100 side is referred to as a file task. The basic sequence of data writing to the disk 90 in the second embodiment is substantially the same as that described with reference to FIG. 49 in the first embodiment, and the correspondence table is also the same. It is formed.

  FIG. 52 schematically shows a process of writing data, which is addressed and transferred from the PC 100 in units of FSN, to the disk 90 according to the second embodiment of the present invention. In the PC 100, data writing is designated in FSN units, that is, in sector units in the disk 90. The data transferred from the PC 100 is supplied to the memory transfer controller 3 via the USB I / F 6 and written into the DRAM 4 under the control of the memory transfer controller 3 (SEQ300). In FIG. 52, one of the 64 kB management areas of the DRAM 4 is shown divided into DRAM address units every 2 kB. Since the data transferred from the PC 100 is addressed in units of FSN, as shown by hatching in the figure, the data is discontinuous with respect to the DRAM address every 2 kB in the 64 kB memory space. Written.

  On the other hand, as described above, data is written from the DRAM 4 to the disk 90 in units of management areas of 64 kB. That is, the data of the DRAM 4 is written to the disk 90 including the DRAM sector in which no data is written on the DRAM 4 (in the example of FIG. 52, the hatched portion of the DRAM 4). For this reason, if necessary data is written in the address (LSN) corresponding to the DRAM address in which no data is written on the DRAM 4 in the disk 90, the data is overwritten.

  In the second embodiment, in order to avoid this, cluster data to be written in units of 64 kB from the DRAM 4 on the disk 90 is temporarily copied to the work RAM 200. Then, of the data copied to the work RAM 200, the data at the address corresponding to the DRAM address to which valid data on the DRAM 4 is not written is copied to the DRAM 4 in units of DRAM sectors. Thereafter, the data of the DRAM 4 is written into the cluster of the disk 90 in units of 64 kB management area.

  This process will be described in more detail. First, the file task designates FSN and LENG from the PC 100 to the disk 90, and issues a write request instructing data writing. This request is passed to the cache task via the USB task, as described above with reference to FIG. 49, and a correspondence table is created based on the passed FSN and LENG by the cache task, and address assignment to the DRAM 4 is performed. Is called. Then, the address is notified from the cache task to the USB task, and the USB task is notified to the file task on the PC 100 side that preparation for data writing is completed.

  Data to be written to the disk 90 is transferred in units of 2 kB from the PC 100 via the USB I / F 6. The transferred data is referred to the sector fill bit in the correspondence table by the cache task, and is written in the DRAM 4 in units of DRAM sectors according to the designated FSN (SEQ300).

  Next, an LCN is designated for the disk 90 based on the correspondence table, and a cluster including the LSN to which data of the DRAM 4 is to be written is read from the disk 90 and written to the work RAM 200 (SEQ301). When data is written to the work RAM 200, the sector fill bit in the correspondence table is referred to by the cache task, and the data transferred from the PC 100 in the DRAM 4 in the work RAM 200 is not written, that is, the sector fill bit is “0”. Data is read in units of DRAM sectors from the address corresponding to the DRAM address, and written to the corresponding DRAM address of the DRAM 4 (SEQ302).

  As described above, data is copied from the work RAM 200 to the DRAM 4 in units of DRAM sectors, and in the DRAM 4, an area other than the DRAM sector in which the data transferred from the PC 100 is written is the data read from the disk 90. Thus, the data is filled in units of DRAM sectors. Then, the data in the DRAM 4 is read out in 64 kB management area units by the cache task, and written in the corresponding LCN of the disk 90 in cluster units by the drive task (SEQ303).

  According to the processing as described above, data transferred from the PC 100 in units of FSN can be written to the disk 90 in units of LSN without destroying other data of the disk 90.

  In the above description, the present invention has been described as applied to a recording apparatus that records data on a disk-shaped recording medium. However, the present invention is not limited to this example. That is, the present invention is also applicable to a recording apparatus that records data on another recording medium or a storage medium that is accessed in a data unit larger than a sector of the buffer memory. For example, the present invention can be applied to a recording apparatus using a semiconductor memory such as a flash memory as a recording medium or a storage medium.

  Here, as an example of the correspondence relationship with the claims, in claim 1, the recording means and the reproducing means correspond to, for example, the media drive unit 2 and the system controller 9. The first memory corresponds to, for example, a cluster buffer memory (DRAM) 4. The second memory corresponds to an area different from the first memory of the RAM 9A and the cluster buffer memory 4 included in the system controller 9, or a memory separately provided as the second memory. The correspondence table is a table whose example is shown in FIG. 47, and is stored in, for example, the RAM 9 </ b> A included in the system controller 9. The memory control means corresponds to, for example, the memory transfer controller 3 and the system controller 9. The fill information corresponds to a sector fill bit, for example.

It is a figure used for description of the disk of the specification of the next generation MD1 system. It is a figure used for description of the recording area of the disc of the specification of the next generation MD1 system. It is a figure used for description of the disk of the specification of the next generation MD2 system. It is a figure used for description of the recording area of the disc of the specification of the next generation MD2 system. It is a basic diagram which shows roughly the format of an example of UID. It is a figure used for description of error correction coding processing of next generation MD1 and next generation MD2. It is a figure used for description of error correction coding processing of next generation MD1 and next generation MD2. It is a figure used for description of error correction coding processing of next generation MD1 and next generation MD2. It is a perspective view used for description of generation of an address signal using wobble. It is a figure used for description of the ADIP signal of the current MD system and the next generation MD1 system. It is a figure used for description of the ADIP signal of the current MD system and the next generation MD1 system. It is a figure used for description of the ADIP signal of a next generation MD2 system. It is a figure used for description of the ADIP signal of a next generation MD2 system. It is a figure which shows the relationship between the ADIP signal and frame in the current MD system and the next generation MD1 system. It is a figure which shows the relationship between the ADIP signal and frame in the next generation MD1 system. It is a figure used for description of the control signal in the next generation MD2 system. It is a block diagram of a disk drive device. It is a block diagram which shows the structure of a media drive part. It is a flowchart which shows the initialization process of an example of the disk by next generation MD1. It is a flowchart which shows the initialization process of an example of the disk by next generation MD2. It is a figure used for description of the 1st example of the management system of audio data. It is a figure used for description of the audio data file by the 1st example of the management system of audio data. It is a figure used for description of the track index file by the 1st example of the management system of audio data. It is a figure used for description of the play order table by the 1st example of the management system of audio data. It is a figure used for description of the programmed play order table by the 1st example of the management system of audio data. It is a figure used for description of the group information table by the 1st example of the management system of audio data. It is a figure used for description of the track information table by the 1st example of the management system of audio data. It is a figure used for description of the parts information table by the 1st example of the management system of audio data. It is a figure used for description of the name table by the 1st example of the management system of audio data. It is a figure for demonstrating the process of an example by the 1st example of the management system of audio data. It is a figure for demonstrating that two or more name slots of a name table can be referred. It is a figure used for description of the process which deletes parts from an audio data file in the 1st example of the management system of audio data. It is a figure used for description of the 2nd example of the management system of audio data. It is a figure which shows the structure of the audio data file by the 2nd example of the management system of audio data. It is a figure used for description of the track index file by the 2nd example of the management system of audio data. It is a figure used for description of the play order table by the 2nd example of the management system of audio data. It is a figure used for description of the programmed play order table by the 2nd example of the management system of audio data. It is a figure used for description of the group information table by the 2nd example of the management system of audio data. It is a figure used for description of the track information table by the 2nd example of the management system of audio data. It is a figure used for description of the name table by the 2nd example of the management system of audio data. It is a figure for demonstrating the process of an example by the 2nd example of the management system of audio data. FIG. 10 is a diagram for explaining that data of one file is divided into a plurality of index areas by an index in the second example of the audio data management method. It is a figure used for description of the connection of a track | truck in the 2nd example of the management system of audio data. It is a figure used for description of the connection of the track | truck by another method in the 2nd example of the management system of audio data. It is a figure for demonstrating moving a management authority with the kind of data to write in the state in which the personal computer and the disk drive apparatus were connected. It is a block diagram which extracts and shows the transfer path | route of the data read / written in a disk. It is an approximate line figure showing the composition of an example of the correspondence table which can associate FSN and LCN. It is a figure for demonstrating a sector fill bit. It is an example sequence chart which shows the process at the time of writing data with respect to a disk from PC. It is a figure for demonstrating that the data on a disk will be overwritten when the data on DRAM are written in a disk. It is a basic diagram which shows the procedure of the copy between DRAM by 1st Embodiment of this invention. It is a basic diagram which shows roughly the process which writes in the disk the data addressed and transferred by the FSN unit from PC by the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Disk drive apparatus 2 Media drive part 3 Memory transfer controller 4 Cluster buffer memory (DRAM)
5 Auxiliary memory 6, 8 USB interface 7 USB hub 9 System controller 9A RAM
DESCRIPTION OF SYMBOLS 10 Audio processing part 12 RS-LDC encoder 13 1-7pp modulation part 14 ACIRC encoder 15 EFM modulation part 16 Selector 17 Magnetic head driver 18 Magnetic head 19 Optical head 22 1-7 Demodulation part 23 RS-LDC decoder 23 EFM modulation part 24 ACIRC decoder 26 Selector 30 ADIP demodulator 32, 33 Address decoder 50 Switch 90 Disk 100 Personal computer 200 Work RAM

Claims (8)

In a recording apparatus for recording data on a recording medium in a first data unit,
Recording means for recording data on a recording medium in a first data unit;
Reproducing means for reproducing data from the recording medium in the first data unit;
A first memory in which a memory space is managed in a unit corresponding to the first data unit and accessible in a second data unit smaller than the first data unit;
A second memory accessible in the second data unit;
Whether the data is valid for the address on the first memory, the first data unit of the recording medium, and the memory space management unit corresponding to the address of the first memory. A correspondence table that correlates fill information shown in data units,
Memory control means for writing recording data to be recorded on the recording medium to the first memory based on the fill information,
When there is a recording request for the recording medium, data in an area where data is recorded by the recording request on the recording medium is reproduced in the first data unit and temporarily stored in the second memory. A recording apparatus characterized by being configured as described above. The recording apparatus according to claim 1,
The recording apparatus, wherein the second data unit is a sector, and the first data unit is a cluster composed of a plurality of the second data units. The recording apparatus according to claim 1,
A data write request to the recording medium is made in the second data unit, and the data transferred in the second data unit in response to the data write request is written to the first memory based on the correspondence table, A recording apparatus, wherein data written in a first memory is recorded in the first data unit of the corresponding recording medium based on the correspondence table. The recording apparatus according to claim 1,
The data reproduced in the first data unit from the area where the recording data on the recording medium is written and the recording data written to the first memory are written to the second memory, and the second memory A recording apparatus, wherein data written in said memory is written in said first data unit in an area of said recording medium in which said recording data is written. The recording apparatus according to claim 4,
The recording apparatus according to claim 1, wherein the address on the first memory is used cyclically, and the data is data written continuously in an address. The recording apparatus according to claim 1,
The recording data on the recording medium in which the data reproduced in the first data unit from the area in which the recording data is written is written into the second memory, and the recording data requested to be written in the second data unit To the first memory based on the fill information,
The data in the second memory area corresponding to the area is written in the area where the recording data is not written in the first memory, and the data in the first memory is converted into the first data unit. A recording apparatus, wherein the recording data is written in an area in which the recording data is written. The recording apparatus according to claim 6, wherein
The recording apparatus is characterized in that an address for the first memory is specified discontinuously with the second data unit as a minimum unit. In a recording method for recording data on a recording medium in a first data unit,
A recording step of recording data on a recording medium in a first data unit;
A reproduction step of reproducing data from the recording medium in the first data unit;
The memory space is managed in a unit corresponding to the first data unit, and an address on the first memory accessible in a second data unit smaller than the first data unit, and the first of the recording medium Associating the data unit with the fill information indicating whether the data is valid for the memory space management unit corresponding to the address of the first memory in the second data unit;
A memory control step of writing recording data for recording on the recording medium into the first memory based on the fill information,
When there is a recording request for the recording medium, data in an area in which data is recorded by the recording request on the recording medium is reproduced in the first data unit and accessible in the second data unit. 2. A recording method characterized in that the recording method is temporarily stored in the second memory.

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