JP2005317148A - Data recording device and method, data reproducing device and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely avoid read errors caused by using a disk recording medium which is not initialized. <P>SOLUTION: This recording/reproducing device 1 records the SRB data which indicates that the cluster has been used at least once for recording data on a disk 4. Accordingly, when reading data from this disk 4, it can be discriminated between the clusters which has been used for recording data and the cluster which has never used for recording data based on the SRB data recorded on the disk 4. Thus, it can be surely prevented from accessing the unrecorded clusters from which any signals can be read. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a data recording apparatus and method, and a data reading apparatus and method. For example, the present invention can be suitably applied to a recording / reproducing apparatus that executes data recording / reproducing processing on a magneto-optical disk such as an MD (Mini Disc). Is.

  Conventionally, in this type of recording / reproducing apparatus, an initialization process for writing an RF signal is performed on the entire circumference of a magneto-optical disk on which no signal is recorded, and the magneto-optical disk after the initialization process is performed. Data is recorded.

  By the way, the recording / reproducing apparatus having such a configuration has a problem that it takes a long time (for example, 20 minutes) for the initialization process for the magneto-optical disk.

  In order to avoid this problem, it is conceivable to store the data as it is on the magneto-optical disk without performing the initialization process.

  However, in this case, when the recording / reproducing apparatus performs the process of reading the recorded data after recording the data in a predetermined part of the recording area of the magneto-optical disk that has not been initialized, the data is still recorded. If a recording area that has never been accessed is accessed, no signal can be read from the accessed storage area, resulting in a read error. As a result, even data that should have been recorded cannot be read. Problems arise.

  The present invention has been made in consideration of the above points, and is a data recording apparatus that can reliably avoid occurrence of a read error caused by using a disc-shaped recording medium that has not been initialized. And a method thereof, and a data reading device and a method thereof.

  In order to solve such a problem, in the present invention, in a data recording apparatus, a first recording means for recording data supplied from the outside on a disk-shaped recording medium, and a first recording in a recording area on the disk-shaped recording medium. There is provided a second recording means for recording record management information indicating a data recorded portion where data has already been recorded by the means on a disk-shaped recording medium.

  Further, in the present invention, in the data reading device, the data is recorded in the recording area and the recording area of the disc-shaped recording medium on which the recording management information indicating the data recorded portion of the recording area is recorded. Data reading means for reading data by accessing, and control means for controlling the data reading means so as not to access an unrecorded portion of the recording area based on the recording management information recorded on the disc-shaped recording medium And so on.

  In this manner, the data recording apparatus records data management information indicating a data recorded portion where data has already been recorded on the disk-shaped recording medium, thereby reading data from the disk-shaped recording medium. The device can discriminate between a data recorded portion where data has been recorded and a data unrecorded portion where data has not been recorded, based on the recording management information recorded on the disk-shaped recording medium. Thus, it is possible to avoid accessing the data unrecorded portion.

  According to the present invention, the data recording device records the record management information indicating the data-recorded portion where the data has already been recorded on the disk-shaped recording medium, and thereby reads the data from the disk-shaped recording medium. The reading device can discriminate between a data recorded portion where data has been recorded and a data unrecorded portion where data has not been recorded, based on the recording management information recorded on the disc-shaped recording medium. Thus, it is possible to avoid accessing the data unrecorded portion. As a result, a data recording apparatus and method, and a data reading apparatus and method that can reliably avoid occurrence of a read error due to use of a disc-shaped recording medium that has not been initialized. Can be realized.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

(1) Overall Configuration of Recording / Reproducing Device In FIG. 1, reference numeral 1 denotes the recording / reproducing device according to the present embodiment as a whole so that data can be recorded / reproduced using a mini-disc (MD) disc as a recording medium. Has been made. However, the recording / reproducing apparatus 1 is not only a mini-disc for music use, but also a high-density disc (also referred to as a next-generation disc) that enables higher-density recording and can be used for storage of various data for computer use. ) Can be dealt with.

  The recording / reproducing apparatus 1 according to the present embodiment can function as an external storage device for the personal computer 2 by being connected to an external device (hereinafter referred to as a personal computer) 2 via a USB cable 3. Yes. Also, music and various data can be downloaded and stored in the disk 4 by connecting to the network via the personal computer 2 or by installing a function that can be directly connected to the network.

  On the other hand, the recording / reproducing apparatus 1 functions as, for example, an audio device without being connected to the personal computer 2 or the like. For example, music data input from another audio device or the like can be recorded on a disc, and music data recorded on the disc 4 can be reproduced and output.

  That is, the recording / reproducing apparatus 1 according to the present embodiment is an apparatus that can be used as a general-purpose data storage device by being connected to the personal computer 2 or the like, and can be used as a single unit or as an audio recording / reproducing device.

  In the following description, the operation state in which data recording / playback is performed as a connected device of the personal computer 2 is referred to as “storage mode”, and the operation state in which audio recording / playback is performed independently without being connected to the personal computer 2 is referred to as “audio mode”. ".

  Here, prior to the description of the configuration of the recording / reproducing apparatus 1 according to the present embodiment, an outline of a next-generation disk by magneto-optical recording, to which the recording / reproducing apparatus 1 corresponds, will be described.

  First, such next-generation discs use a FAT (File Allocation Table) system as a file management system to record and play back content data such as audio data so that it can be compatible with current personal computers. It is. In addition, the current MD system is improved by an error correction method, a modulation method, and the like, thereby increasing the data recording capacity and improving the data reliability.

  Two types of specifications are currently being developed as recording and playback formats for next-generation discs. For the sake of explanation, these will be referred to as a first next generation MD and a second next generation MD.

  The first next-generation MD is a specification that uses a disk that is exactly the same as the disk used in the current MD system, and the second next-generation MD is a disk that is used in the current MD system. The outer shape is the same, but by using magnetic super-resolution (MSR) technology, the recording density in the linear recording direction is increased and the recording capacity is further increased.

  In the current MD system (audio MD or MD-DATA), 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.

  In the specifications of the first and second next generation MDs, the shape of the disk and the shape of the cartridge are all the same. Regarding the start position of the lead-in area, the first and second next-generation MD disks start from a radial position of 29 mm and are the same as the disks used in the current MD system. That is, compatibility with the conventional MD system on the outer shape is ensured.

  The track pitch is set to 1.25 μm in the second next generation MD, and the track pitch is set to 1.6 μm in the first next generation MD that uses the disk of the current MD system. The bit length of the first next generation MD is 0.44 μm / bit, and the second next generation MD is 0.16 μm / bit. The redundancy is 20.50% for both the first and second next generation MDs.

  In the second generation MD 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 recording layer is transferred, so that a minute mark can be seen in the beam spot. It is a thing using what becomes.

  Specifically, in the second generation MD disc, 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 the second generation MD disc, the groove is deepened and the groove is sharpened to improve detrack margin, crosstalk from the land, crosstalk of the wobble signal, and focus leakage. Yes. That is, in the second next-generation MD specification disk, 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.

  Regarding the optical specification, in the specification of the first next generation MD, the laser wavelength λ is 780 nm, and the aperture ratio NA of the objective lens of the optical head is 0.45. Similarly, in the specifications of the second next generation MD, the laser wavelength λ is 780 nm, and the aperture ratio NA of the optical head is 0.45.

  As the recording system, the first next generation MD employs a groove recording system that uses a groove (groove on the disk surface of the disk) as a track for recording and reproduction, and the second next generation MD employs a groove recording system and domain wall motion. A detection (DWDD) method is employed.

  Furthermore, as an error correction coding system, 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 first and second next generation MDs, RS A block-complete code combining a Reed Solomon-Long Distance Code (LDC) and a Burst Indicator Subcode (BIS) is used. By employing this block completion type error correction code, a linking sector is not required. 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 specification of ADIP is the same as that of the current MD system. However, in the current MD system, a sector of 2352 bytes is used as an access unit for recording and reproduction, whereas the first and second next generation MDs are used. In the specification, 64 Kbytes are used as a recording / reproducing access unit (recording block).

  In the current MD system, a convolutional code called ACIRC is used as an error correction code, whereas in the specifications of the first and second next generation MDs, a block completion type combining LDC and BIS. Is used.

  Therefore, in the specification of the first next generation MD that uses the disk of the current MD system, the handling of the ADIP signal is made different from that in the current MD system. In the second next-generation MD, the specification of the ADIP signal is changed so as to match the specification of the second next-generation MD.

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

  Further, the disk drive system is CLV (Constant Linear Verocity), and the linear velocity is 2.7 m / sec in the first next generation MD specification, and 1.98 m in the second next generation MD specification. Per second. 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 first next-generation MD in which a disk used in the current MD system is used 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 modulation 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.

  On the other hand, in the disc of the second next generation MD specification 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 in the first next generation MD, and 9.8 Mbit / sec in the second next generation MD.

  FIG. 2A shows the configuration of the first next-generation MD disk. The first next-generation MD disc is a diverted version of the current MD system disc. That is, a dielectric film, a magnetic film, a dielectric film, and a reflective film are laminated on a transparent polycarbonate substrate. Further, a protective film is laminated thereon.

  In the first next-generation MD disk, as shown in FIG. 2A, a P-TOC (pre-mastered TOC (Table Of Contents)) area is provided in the lead-in area on the inner periphery of the disk. This is a pre-mastered area as a physical structure, and control information and the like are recorded as P-TOC information by embossed pits.

  The outer periphery of the lead-in area in which the P-TOC area is provided in this way is a recordable area (recording area capable of magneto-optical recording), and a recordable / reproducible area in which a groove is formed as a guide groove of a recording track. It has become. A U-TOC (user TOC) is provided on the inner periphery of the recordable area.

  The U-TOC in this case has the same configuration as the U-TOC used for recording disc management information in the current MD system. For confirmation, the U-TOC is management information that can be rewritten according to the order of tracks (audio tracks / data tracks), recording, erasing, etc. in the current MD system. The start position, end position, and mode are managed for the parts constituting the track.

  An alert track is provided on the outer periphery of the U-TOC. The alert track is a warning track on which a warning sound indicating that this disc is used in the first next generation MD system and cannot be reproduced by a player of the current MD system is recorded.

  FIG. 2B shows the configuration of the recordable area of the disc of the first next generation MD specification. As is clear from FIG. 2B, a U-TOC and an alert track are provided at the beginning (inner peripheral 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 the EFM modulation. The area where data is modulated and recorded by EFM modulation 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. . Since such a guard band is provided, it is possible to prevent a malfunction from being caused by mounting the disc of the first next generation MD specification on the current MD player.

  A DDT (Disc Description Table) area and a secure track are provided at the beginning (inner circumference side) of an area where data is modulated and recorded by 1-7pp modulation. The DDT area is provided for performing a replacement sector process for a physically defective sector (recording block). A disc ID is further recorded in the DDT area. The disk ID is an identification code unique to each recording medium, and is based on a predetermined random number, for example.

  In addition, a bit map corresponding to a recorded cluster called “1” is recorded as a scratch pad area or SRB (Serial Recording Bitmap). The secure 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 1-7pp modulation. This 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.

  In such a disc of the first next generation MD specification, in the above-mentioned U-TOC area, information on the start position of the alert track and the start position of the area where the data is modulated by 1-7pp modulation and recorded This information is recorded.

  Here, when a first next-generation MD disc having the above-described configuration is loaded into a player of the current MD system, the U-TOC area is read, and the position of the alert track is known from the U-TOC information. , The alert track is accessed and the playback of the alert track is started.

  In the alert track, a warning sound is recorded indicating that this disc is used in the first next generation MD system and cannot be reproduced by a player of the current MD system. This warning sound informs that this disc cannot be used with the current MD system player. Note that the warning sound in this case may be a warning in a language such as “cannot be used with this player”. Of course, a buzzer sound may be used.

  On the other hand, when the disc of the first next generation MD is mounted on the player compliant with the first next generation MD, the U-TOC area is read, and the data is 1-7pp modulated from the U-TOC information. The start position of the recorded area is known, and the above-described DDT, secure track, and FAT area are read. As described above, in the 1-7pp modulation data area, data management is performed by the FAT system, not by the U-TOC.

  FIG. 3A shows the configuration of a second next-generation MD disk. Also in this case, the disk is formed by laminating a dielectric film, a magnetic film, a dielectric film, a reflective film on a transparent polycarbonate substrate, and a protective film on the upper layer.

  In the case of the second next-generation MD disc, as shown in the figure, control information is recorded in the lead-in area on the inner periphery of the disc by an ADIP signal.

  In the second next-generation MD disc, the lead-in area is not provided with a P-TOC by embossed pits, and instead, control information by an ADIP signal is used. The recordable area starts from the outer periphery of the lead-in area, and is a recordable / reproducible area in which a groove is formed as a guide groove for a recording track. In this recordable area, data is modulated and recorded by the 1-7 pp modulation method.

  Whether a disc is the first next generation MD or the second next generation MD can be determined from the lead-in information. That is, if a P-TOC due to an embossed pit is detected in the lead-in, it can be determined that the disc is the current MD or the first next-generation MD. If control information based on the ADIP signal is detected in the lead-in and the P-TOC due to the embossed pit is not detected, it can be determined that the second next-generation MD.

  The discrimination between the first and second next generation MDs 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 detection hole for disc identification may be provided in the cartridge or the like.

  As the configuration of the recordable area of the disc of the second next generation MD specification, as shown in FIG. 3B, an area where data is modulated and recorded by the 1-7pp modulation method is formed. A DDT area and a secure track are provided at the head (inner circumference side) of an area where data is modulated and recorded by the 1-7pp modulation method.

  Also in this case, the above-mentioned DDT area is an area for performing a replacement sector process on a physically defective sector (recording block). In the DDT area, the above-mentioned disc ID is recorded. Further, the above-described scratch pad area and SRB are provided. Further, in this case, information for protecting the content is stored in the secure track.

  Further, a FAT area is also 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.

  In the second next-generation MD disc as described above, as is apparent from FIG. 3B, the U-TOC area is not provided. That is, the second next-generation MD disc is assumed to be used only by a player compliant with the next-generation MD.

  In a player compliant with the next-generation MD, when a second next-generation MD disc is loaded, the DDT area, secure track, and FAT area at a predetermined position are read, and data management is performed using the FAT system. It will be.

  Data managed by the FAT system and recorded in the data area of FIGS. 2B and 3B includes a data file, a track information file (TIF), a key information file, a MAC list file, and the like.

  The data file is a data file such as audio data or computer use data.

  The track information file (TIF) is a file in which various information for managing music data stored in an audio data file is described. The track information file includes a play order table that indicates the playback order of the music, a programmed play order table that manages the playback order specified by the user, a group information table that manages whether the music is in groups of albums, etc. ), A part information table for managing parts of each track, and a name table for managing character information added to each track.

  Furthermore, the key information file describes data indicating key version information in the encryption method. Further, the MAC list file describes the MAC value for tampering check.

  Returning to FIG. 1, the overall configuration of the recording / reproducing apparatus 1 according to this embodiment will be described.

  In FIG. 1, a USB interface 10 performs processing for data transmission when connected to a personal computer 2 connected as a host device with a USB cable 3.

  The cache memory 11 is composed of, for example, a D-RAM (Dynamic-RAM (Random Access Memory)), and data to be written to the disk 4 loaded in the storage unit 12 or data read from the disk 4 by the storage unit 12. Do buffering for.

  The storage unit 12 is a recording / reproducing unit corresponding to the current MD and the first and second next-generation MDs described above. In the recording mode, the storage unit 12 applies EFM modulation scheme or 1 to data transferred from the cache memory 11. Modulate by -7pp modulation method and write to disk 4. In the reproduction mode, the storage unit 12 demodulates the data read from the disk 4 using the EFM demodulation method or the 1-7pp demodulation method and transfers the data to the cache memory 11.

  The system controller 13 receives various commands such as a write request and a read request from the personal computer 2 via the USB interface 10 and performs various control processes such as controlling the cache memory 11 and the storage unit 12 according to the commands. Execute.

  For example, when the system controller 13 receives a data write request specifying the address and data length transmitted from the personal computer 13 via the USB interface 10, the system controller 13 controls the USB interface 10 and the cache memory 11 accordingly. Thereafter, the data transmitted from the personal computer 13 is input to the cache memory 11 via the USB interface 10 and temporarily stored. The system controller 13 then controls the cache memory 11 and the storage unit 12 to transfer the data temporarily stored in the cache memory 11 to the storage unit 12 and write it to the designated address position on the disk 4. Make it.

  When the system controller 13 receives a data read request specifying the address and data length transmitted from the personal computer 13 via the USB interface 10, the system controller 13 controls the storage unit 12 and the cache memory 11 accordingly. The designated data is read from the disk 4 and transferred to the cache memory 11 and temporarily stored in the cache memory 11. The system controller 13 then controls the cache memory 11 and the USB interface 10 to transmit data temporarily stored in the cache memory 11 to the personal computer 2 via the USB interface 10.

  The input / output processing unit 14 performs processing for input / output of recording / playback data, for example, when the recording / playback apparatus 1 functions alone as an audio device.

  The input / output processing unit 14 includes, for example, an analog audio signal input unit such as a line input circuit / microphone input circuit, an analog / digital converter, a digital audio data input unit, and an ATRAC compression encoder / decoder as an input system. The ATRAC compression encoder / decoder is a circuit for executing compression / decompression processing of audio data by the ATRAC system. Of course, the recording / reproducing apparatus 1 of the present embodiment may adopt a configuration capable of recording / reproducing compressed audio data in another format such as MP3. In this case, these compressed audio data may be used. An encoder / decoder corresponding to the data format may be provided.

  In the present embodiment, video data is not limited to a format that can be recorded / reproduced. For example, MPEG (Moving Pictures Experts Group) 4 can be considered. As the input / output processing unit 14, an encoder / decoder corresponding to such a format may be provided.

  Further, the input / output processing unit 14 includes an analog audio signal output unit such as a digital audio data output unit, a digital / analog converter, and a line output circuit / headphone output circuit as an output system.

  In this case, an encryption processing unit (not shown) is provided in the input / output processing unit 14. In the encryption processing unit, for example, the AV data to be recorded on the disk is encrypted by a predetermined algorithm. For example, when the AV data read from the disk is encrypted, a decryption process for decryption is executed as necessary.

  Audio data is recorded on the disc as processing via the input / output processing unit 14 when, for example, digital audio data (or an analog audio signal) is input to the input / output processing unit 14 as an input TIN. 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 analog / digital converter is subjected to ATRAC compression encoding as necessary and stored in the cache memory 11. . Then, the data is read from the cache memory 11 and transferred to the storage unit 12 at a predetermined timing (data unit corresponding to an ADIP cluster). In the storage unit 12, the transferred compressed data is modulated by a predetermined modulation method and written to the disk 4.

  When mini-disc type audio data is reproduced from the disk, the storage unit 12 demodulates the reproduced data into the ATRAC compressed data state and transfers the data to the cache memory 11. The data is read from the cache memory 11 and transferred to the input / output processing unit 14. The input / output processing unit 14 performs ATRAC compression decoding on the supplied compressed audio data 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 digital / analog converter.

  A ROM (Read Only Memory) 15A stores an operation program of the system controller 13, fixed parameters, and the like. The RAM 15B is used as a work area by the system controller 13 and is a storage area for various necessary information. For example, various management information and special information read from the disk 4 by the storage unit 12, such as the above-described P-TOC data, U-TOC data, FAT data, etc., are stored in the cache memory 11. In the storage mode, the data is then transferred to the personal computer. However, the system controller 13 takes necessary information out of the management information into the RAM 15B for processing.

  The cache management memory 16 is composed of, for example, an S-RAM (Static-RAM), and stores information for managing the state of the cache memory 11. The system controller 13 controls data cache processing while referring to the cache management memory 16.

  The display unit 17 displays various information to be presented to the user based on the control of the system controller 13. For example, character data such as operation state, mode state, name of music, track number, time information, and other information are displayed.

  In the present embodiment, for example, when the disk 4 is a next-generation disk, it is assumed that image data is stored in association with the music data on the disk 4, but the display unit 17 It is also conceivable to display the image data correlated in this way based on the control of the system controller 13 when the disk 4 is loaded or played back.

  Various operation buttons, a jog dial, and the like are formed in the operation unit 18 as various operators for user operations. The user gives a required operation instruction to the recording / reproducing apparatus 1 by operating the operation unit 18. The system controller 13 performs predetermined control processing based on the operation information input by the operation unit 18.

  Note that the configuration of the recording / reproducing apparatus 1 described so far is merely an example, and for example, the input / output processing unit 14 may be provided with an input / output processing system corresponding to not only audio data but also video data. Further, the connection with the personal computer 2 is not USB, but other external interfaces such as IEEE (Institute of Electrical and Electronic Engineers) 1394 may be used. Further, as the operation unit 18, it is possible to provide an operation element similar to that exemplified above on the remote controller.

(2) Configuration of SRB Data By the way, the recording / reproducing apparatus 1 records SRB (Signal Recording Bitmap) data in a DDT (Disc Description Table) area on the disc 4 as described above. Incidentally, in the case of the present embodiment, it is assumed that the initialization process has not been performed on the disk 4.

  Here, the SRB data will be described in detail with reference to FIGS. As schematically shown in FIG. 4, the SRB data indicates that the data has already been recorded in the portion of the recordable area on the disc 4 corresponding to the cluster where the data has already been recorded. Information (shaded in the figure) is shown. In practice, this SRB data has an information amount of about 2 recording blocks (128 kbytes).

  Next, a specific example of this SRB data is shown in FIG. In this SRB data, a cluster number for identifying each of a plurality of clusters provided in the recordable area is shown.

  The recording / reproducing apparatus 1 uses a cluster number of a cluster for which a data has not yet been recorded (hereinafter also referred to as a data unrecorded cluster) among a plurality of clusters set in the recordable area. A bit “0” indicating that it is a data unrecorded cluster is written to the SRB data so as to be associated with it, and a cluster in which data has already been recorded (hereinafter also referred to as a data recorded cluster). )), A bit “1” indicating that the cluster has been recorded is written to the SRB data in association with the cluster number of the cluster.

(3) Data Write Process / Data Read Process Next, when data to be written to the disk 4 is supplied from the personal computer 2 to the recording / reproducing apparatus 1 via the USB cable 3, the recording / reproducing apparatus 1 executes this. The data writing process will be described.

  For example, when the disk 4 is loaded in the storage unit 12, the system controller 13 of the recording / playback apparatus 1 shown in FIG. 1 reads the SRB data from the DDT area of the disk 4 and stores it in the cache memory 11. Expand. In the following, for convenience of explanation, the SRB data expanded in the cache memory 11 is referred to as expanded SRB data.

  The personal computer 2 supplies, for example, document data (document data generated by Microsoft Word (R) or the like) to the recording / reproducing apparatus 1 as data to be written to the magneto-optical disk 4.

  Incidentally, the recording / reproducing apparatus 1 records the document data supplied from the personal computer 2 so as to be scattered in a plurality of clusters on the disk 4 in units of recording blocks. Therefore, when the personal computer 2 supplies the document data to the recording / reproducing apparatus 1, the personal computer 2 notifies the recording / reproducing apparatus 1 of a plurality of addresses in order to designate each cluster to which the document data is recorded.

  When the document data is supplied from the personal computer 2 and a plurality of addresses indicating the recording destination cluster of the document data are notified, the system controller 13 temporarily stores the supplied document data in the cache memory 11 in units of recording blocks. At the same time, the expanded SRB data is rewritten based on the notified plurality of addresses.

  That is, the system controller 13 rewrites the expanded SRB data (FIG. 5A) among the cluster numbers (for example, cluster numbers # 4, # 16, and # 50) corresponding to the notified plurality of addresses. When the cluster number # 4 associated with the bit “0” indicating the data unrecorded cluster is recognized, the bit “0” is rewritten to “1” indicating the data recorded cluster (FIG. 5). (B)). Next, when the system controller 13 recognizes the cluster number # 16 associated with the bit “1” indicating that the data has been recorded, the system controller 13 does not rewrite the bit “1” (FIG. 5B )). Further, when the system controller 13 recognizes the cluster number # 50 associated with the bit “0” indicating that the data is not recorded, the system controller 13 sets “1” indicating that the bit “0” is the data recorded cluster. "(Fig. 5B).

  In this way, the system controller 13 determines that there is a cluster in which data has not yet been recorded (in this case, clusters with cluster number # 4 and cluster number # 50) among the clusters in which document data is to be recorded. Bit “0” shown in association with the cluster number of the cluster in the expanded SRB data is rewritten in advance to bit “1”.

  Then, the system controller 13 sequentially records the document data temporarily stored in the cache memory 11 for each cluster of cluster numbers # 4, # 16, and # 50 in recording block units. Further, the system controller 13 is configured to rewrite the expanded SRB data (FIG. 5 (B)) after the rewrite processing to the DDT area on the disk 4 at a predetermined SRB data write back timing (described later).

  Incidentally, in the case of the present embodiment, the personal computer 2 supplies the document data to the recording / reproducing apparatus 1 and then sends FAT data indicating the address of the recording destination cluster of the document data to the recording / reproducing apparatus 1. It is made to supply. In response to this, the system controller 13 of the recording / reproducing apparatus 1 records the document data in each cluster on the disk 4 and then records the supplied FAT data in the FAT area of the disk 4. .

  Next, processing when the personal computer 2 reads out the document data recorded on the disc 4 via the recording / reproducing apparatus 1 will be described.

  The system controller 13 of the recording / reproducing apparatus 1 reads, for example, SRB data (FIG. 5B) from the disk 4 and caches it when the disk 4 to be read is loaded into the storage unit 12. Expanded in the memory 11.

  The personal computer 2 instructs the recording / reproducing apparatus 1 loaded with the disc 4 to read FAT data from the FAT area of the disc 4. In response to this, the system controller 13 of the recording / reproducing apparatus 1 controls the storage unit 12 to read FAT data from the disk 4 and send it to the personal computer 2.

  The personal computer 2 recognizes the address of each cluster in which the document data is stored based on the FAT data from the recording / reproducing apparatus 1 and then, as a data read command for causing the recording / reproducing apparatus 1 to read the document data. The recording / reproducing apparatus 1 is notified of the address of each recognized cluster.

  When a plurality of addresses are notified from the personal computer 2 as a data read command, the recording / reproducing apparatus 1 recognizes each cluster number # 4, # 16, # 50 corresponding to the plurality of addresses and then develops the developed SRB data (FIG. 5 (B)), whether or not the bit associated with each of the recognized cluster numbers # 4, # 16, # 50 is “1” indicating that it is a data-recorded cluster. Determine whether.

  In this case, a determination result is obtained that the bit “1” is associated with each cluster number # 4, # 16, and # 50. Document data is read from each corresponding cluster in units of recording blocks, and is sent to the personal computer 2. Thus, the personal computer 2 can read out the document data recorded on the disc 4 via the recording / reproducing apparatus 1.

  By the way, the personal computer 2 notifies the recording / reproducing apparatus 1 of an arbitrary address as a data read command in order to recognize, for example, the recording state of data on the disc 4 (the number and type of data recorded on the disc 4). There is a case.

  In this case, when the recording / reproducing apparatus 1 recognizes, for example, the cluster number # 2 as the cluster number corresponding to the address notified from the personal computer 2 as the data read command, the recording / reproducing apparatus 1 refers to the developed SRB data (FIG. 5B). Thus, it is determined whether or not the bit associated with the recognized cluster number # 2 is “1” indicating that it is a data recorded cluster.

  In this case, since the determination result that the bit “0” is associated with the cluster number # 2 is obtained, the recording / reproducing apparatus 1 has not yet recorded data in the cluster corresponding to the cluster number # 2. As a result, the data padded with “0” (hereinafter referred to as “0” data) is sent to the personal computer 2 without accessing this cluster.

  In this way, the recording / reproducing apparatus 1 can avoid accessing a data unrecorded cluster (in this case, cluster with cluster number # 2) in which no data has been recorded yet, and thus a read error can be avoided. Can be avoided. At this time, the recording / reproducing apparatus 1 causes the personal computer 2 to recognize that no data is recorded in the cluster of cluster number # 2 by sending “0” data to the personal computer 2. Can do.

(4) SRB Data Write Back Timing Next, the SRB data write back timing for writing back the expanded SRB data expanded in the cache memory 11 to the DDT area on the disk 4 will be described.

  In this recording / reproducing apparatus 1, the SRB data write-back timing can be changed by a user setting operation. In other words, in the case of the present embodiment, four types of SRB data write-back timings are registered in advance in the recording / reproducing apparatus 1, and the user performs a setting operation to change the four types of SRB data write-back timings. To SRB data write back timing can be selected.

  For example, when the user performs a setting operation for selecting the first SRB data write-back timing from among the four types of SRB data write-back timing via the personal computer 2 connected to the recording / reproducing apparatus 1, The system controller 13 of the recording / reproducing apparatus 1 rewrites the setting information stored in the ROM 15A, for example. Thereafter, the system controller 13 writes back the developed SRB data to the DDT area of the disk 4 at the first SRB data write back timing based on the rewritten setting information.

  Here, the first SRB data write-back timing will be described with reference to FIG. When the document data D1 is sequentially supplied from the personal computer 2, the system controller 13 of the recording / reproducing apparatus 1 stores the document data D1 in the cache memory 11 in units of recording blocks. As a result, the first block data BD1, the second block data BD2, and the third block data BD3 are stored in the cache memory 11 as the document data D1 supplied from the personal computer 2.

  The system controller 13 uses the cluster number # corresponding to the address notified from the personal computer 2 for the first block data BD1 of the first block data BD1, the second block data BD2, and the third block data BD3 thus stored. When recording in the cluster No. 4, by executing the rewriting process of the expanded SRB data before executing this recording, the bit “0” associated with the cluster number # 4 of the cluster is changed to the bit “1”. rewrite.

  Next, the system controller 13 reads the first block data BD1 from the cache memory 11, records this in the cluster of cluster number # 4 on the disk 4, and stores the expanded SRB data after such rewrite processing in the DDT area of the disk 4 Write back against.

  Similarly, the system controller 13 executes this recording when recording the second block data BD2 next to the first block data BD1 in the cluster having the cluster number # 16 corresponding to the address notified from the personal computer 2. The expanded SRB data is rewritten before, but since the bit associated with the cluster number # 16 of the cluster is “1”, the bit “1” is left without being rewritten.

  Next, the system controller 13 reads the second block data BD2 from the cache memory 11, records this in the cluster of cluster number # 16 on the disk 4, and writes back the expanded SRB data to the DDT area of the disk 4. .

  In this way, the recording / reproducing apparatus 1 set at the first SRB data write-back timing records the developed SRB every time the block data BD1, BD2,. Data is written back to the DDT area of the disk 4.

  Here, for example, consider the case where the expanded SRB data is written back to the DDT area after the block data BD1 and BD2 for two recording blocks are recorded on the disk 4. In this case, for example, when the recording of the second block data BD2 is started after the first block data BD1 is recorded in the cluster of the cluster number # 4, the drive power supply to the recording / reproducing apparatus 1 is stopped for some reason. The expanded SRB data rewritten with the recording of the first block data BD1 is not written back to the DDT area of the disk 4. As a result, even if the address specifying the cluster of cluster number # 4 is input from the personal computer 2 as a data read command from the personal computer 2 after the supply of driving power is resumed, the recording / reproducing apparatus 1 caches from the disk 4 after the resume. In the expanded SRB data expanded in the memory 11, the bit “0” is indicated in association with the cluster number # 4, so the first block data BD1 is actually recorded in the cluster of the cluster number # 4. However, the data “0” is sent to the personal computer 2 without reading it. Thus, in this case, reading of the first block data BD1 recorded on the disk 4 cannot be guaranteed.

  On the other hand, the recording / reproducing apparatus 1 set at the first SRB data write-back timing records the block data BD (BD1, BD2,...) For one recording block on the disc 4 every time. Since the expanded SRB data is written back to the DDT area of the disk 4, the recording of the second block data BD2 is started after the first block data BD1 is recorded in the cluster of the cluster number # 4. Even if the supply of the driving power to the reproducing apparatus 1 is stopped, the expanded SRB data rewritten with the recording of the first block data BD1 is written back to the DDT area of the disk 4. As a result, even if the address specifying the cluster of cluster number # 4 is input from the personal computer 2 as a data read command from the personal computer 2 after the supply of driving power is resumed, the recording / reproducing apparatus 1 caches from the disk 4 after the resume. In the expanded SRB data expanded in the memory 11, the bit “1” is shown in association with the cluster number # 4. Therefore, the first block data BD1 is read from the cluster of the cluster number # 4 and is stored in the personal data. It can be sent to the computer 2. Thus, in this case, reading of the first block data BD1 recorded on the disk 4 can be ensured.

  As described above, the recording / reproducing apparatus 1 set at the first SRB data write-back timing reads the data recorded on the disk 4 so far, even when a failure such as the stop of the supply of driving power occurs. You can be sure.

  By the way, when the user performs a setting operation for selecting the second SRB data write-back timing from the four types of SRB data write-back timing via the personal computer 2 connected to the recording / reproducing apparatus 1, The system controller 13 of the recording / reproducing apparatus 1 rewrites the setting information stored in the ROM 15A, for example. After that, the system controller 13 writes back the developed SRB data to the DDT area of the disk 4 at the second SRB data write back timing based on the setting information after the rewriting.

  Here, the second SRB data write-back timing will be described with reference to FIG. When document data is sequentially supplied from the personal computer 2, the system controller 13 of the recording / reproducing apparatus 1 stores the document data in the cache memory 11 in units of recording blocks. As a result, the cache memory 11 stores the first block data BD1, the second block data BD2, and the third block data BD3 as document data supplied from the personal computer 2.

  The system controller 13 uses the cluster number # corresponding to the address notified from the personal computer 2 for the first block data BD1 of the first block data BD1, the second block data BD2, and the third block data BD3 thus stored. When recording in the cluster No. 4, by executing the rewriting process of the expanded SRB data before executing this recording, the bit “0” associated with the cluster number # 4 of the cluster is changed to the bit “1”. rewrite. Then, the system controller 13 reads the first block data BD1 from the cache memory 11 and records it in the cluster of cluster number # 4 in the disk 4.

  Similarly, the system controller 13 executes this recording when recording the second block data BD2 next to the first block data BD1 in the cluster having the cluster number # 16 corresponding to the address notified from the personal computer 2. The expanded SRB data is rewritten before, but since the bit associated with the cluster number # 16 of the cluster is “1”, the bit “1” is left without being rewritten. Then, the system controller 13 reads the second block data BD2 from the cache memory 11 and records it in the cluster of cluster number # 16 on the disk 4.

  Similarly, the system controller 13 executes the recording when recording the third block data BD3 next to the second block data BD2 in the cluster having the cluster number # 50 corresponding to the address notified from the personal computer 2. By executing the rewriting process of the expanded SRB data before the operation, the bit “0” associated with the cluster number # 50 of the cluster is rewritten to the bit “1”. Then, the system controller 13 reads the third block data BD3 from the cache memory 11 and records it in the cluster having the cluster number # 50 in the disk 4.

  Thereafter, when the system controller 13 records the FAT data indicating the address of the recording destination cluster in which the document data D1 (BD1, BD1, BD3) is recorded in the FAT area of the disk 4, it simultaneously develops the developed SRB. Data is written back to the DDT area of the disk 4.

  In this way, the recording / reproducing apparatus 1 set at the second SRB data write-back timing synchronizes the FAT data with respect to the DDT area of the disk 4 in synchronization with the timing at which the FAT data is recorded onto the disk 4. To write back.

  Here, the personal computer 2 conforming to the FAT system is configured to block data BD1, BD2, BD3 recorded so as to be scattered on the disc 4 based on the FAT data recorded in the FAT area of the disc 4. Are collectively recognized as one processing unit (document data D1). Accordingly, the recording / reproducing apparatus 1 is only required to ensure reading of data from the disk 4 for each processing unit of the personal computer 2.

  In this regard, the recording / reproducing apparatus 1 set at the second SRB data write-back timing records the timing of recording the FAT data on the disk 4, that is, the data for the processing unit of the personal computer 2 (document data D1). Since the developed SRB data is written back to the DDT area of the disk 4 at the completion timing, reading of data recorded on the disk 4 for each processing unit of the personal computer 2 can be ensured. Compared with the recording / reproducing apparatus 1 in the case where the first SRB data write-back timing is set, the number of times of writing back the developed SRB data to the disk 4 is reduced, so that the speed performance of the data write process on the disk 4 is markedly improved. And can be improved.

  By the way, when the user performs a setting operation for selecting the third SRB data write-back timing from among the four types of SRB data write-back timing via the personal computer 2 connected to the recording / reproducing apparatus 1, The system controller 13 of the recording / reproducing apparatus 1 rewrites the setting information stored in the ROM 15A, for example. Thereafter, the system controller 13 writes back the expanded SRB data to the DDT area of the disk 4 at the third SRB data write back timing based on the setting information after the rewriting.

  Here, the third SRB data write-back timing will be described with reference to FIG. The system controller 13 of the recording / reproducing apparatus 1 stores data to be written to the disk 4 such as document data sequentially from the personal computer 2 in the cache memory 11 in recording block units. As a result, a plurality of block data BD1, BD2,... Are stored in the cache memory 11 as data to be written to the disk 4.

  When the system controller 13 records each block data BD1, BD2,... Stored in the cache memory 11 on the disk 4, the system controller 13 executes rewriting processing of the expanded SRB data for each block data BD1, BD2,. However, the block data BD1, BD2,... Are sequentially recorded on the disk 4. When the system controller 13 finishes recording the 30th block data BD30 from the first recorded block data BD1 to the disk 4, the system controller 13 writes the expanded SRB data expanded in the cache memory 11 in the DDT area of the disk 4. return. Thereafter, when the system controller 13 has recorded 30 block data BD31,... Remaining in the cache memory 11, the developed SRB data is written back to the DDT area of the disk 4 again.

  In this way, the recording / reproducing apparatus 1 set at the third SRB data write-back timing finishes recording a predetermined number (in this case, 30) of block data BD (BD1, BD2,...) On the disk 4. In addition, since the expanded SRB data is written back to the DDT area of the disk 4, the data recorded on the disk 4 can be read at a predetermined level while maintaining the speed performance of the data writing process on the disk 4 at a predetermined level. Can be ensured.

  By the way, when the user performs a setting operation for selecting the fourth SRB data write-back timing from among the four types of SRB data write-back timing via the personal computer 2 connected to the recording / reproducing apparatus 1, the corresponding operation is performed. The system controller 13 of the recording / reproducing apparatus 1 rewrites the setting information stored in the ROM 15A, for example. Thereafter, the system controller 13 writes back the developed SRB data to the DDT area of the disk 4 at the fourth SRB data write back timing based on the rewritten setting information.

  Here, the fourth SRB data write-back timing will be described with reference to FIG. The system controller 13 of the recording / reproducing apparatus 1 stores data to be written to the disk 4 such as document data sequentially from the personal computer 2 in the cache memory 11 in recording block units. As a result, a plurality of block data BD1, BD2,..., BD80 are stored in the cache memory 11 as data to be written to the disk 4.

  When the system controller 13 records each block data BD1, BD2,... Stored in the cache memory 11 on the disk 4, the system controller 13 executes rewriting processing of the expanded SRB data for each block data BD1, BD2,. However, the block data BD1, BD2,... Are sequentially recorded on the disk 4. When the system controller 13 finishes recording all the block data BD1 to BD80 stored in the cache memory 11 on the disk 4, the system controller 13 writes the expanded SRB data expanded in the cache memory 11 in the DDT area of the disk 4. return.

  As described above, when the recording / reproducing apparatus 1 set at the fourth SRB data write-back timing finishes recording all the block data BD1 to BD80 stored in the cache memory 11 on the disk 4, the cache memory 11 As compared with the recording / reproducing apparatus 1 in the case where any one of the first to third SRB data write back timings is set by writing back the developed SRB data developed on the DDT area of the disk 4. Thus, it is possible to reduce the number of times of writing the developed SRB data back to the disk 4, and thus the speed performance of the data writing process to the disk 4 can be remarkably improved.

(5) Functional Block Configuration of Recording / Reproducing Device Next, a functional block configuration of the recording / reproducing device 1 will be described with reference to FIG. Incidentally, the control unit 30 shown in FIG. 10 corresponds to the system controller 13. In this embodiment, the FAT determination unit 31, the SRB control unit 32, the read / write control unit 33, the first switch unit 34, the second switch unit 35, and the “0” data in the control unit 30 are used. The generation unit 36 and the like are configured by software (program).

  For example, the recording / reproducing apparatus 1 set at the second SRB data write-back timing sets the block data BD1 for one recording block to be written to the disc 4 from the personal computer 2 and the recording destination of the block data BD1. When the data recording destination signal S1 shown is input, the block data BD1 is stored in the cache memory 11, and the data recording destination signal S1 is supplied to the FAT determination unit 31 and the read / write control unit 33. Here, the data recording destination signal S1 indicates an address indicating a data recording destination, a length of the data, and the like.

  When the data recording destination signal S <b> 1 is supplied from the personal computer 2, the FAT determination unit 31 supplies this to the SRB control unit 32. At this time, the SRB control unit 32 refers to the expanded SRB data (FIG. 5A) expanded in the cache memory 11, and thereby sets the address indicated in the data recording destination signal S1 from the FAT determination unit 31. When it is recognized that “0” indicating that the data is an unrecorded cluster is indicated as the corresponding cluster number # 4 bit, the bit “0” is “1” indicating that it is a data recorded cluster. (FIG. 5B).

  Further, the FAT determination unit 31 is the FAT data to be recorded in the FAT area of the disk 4 based on the data recording destination signal S1 when the data recording destination signal S1 is supplied from the personal computer 2. It is determined whether or not there is.

  When the FAT determination unit 31 recognizes that the block data BD1 is not FAT data as a result of the determination, the FAT determination unit 31 supplies the first signal S2 indicating this to the read / write control unit 33. When it is recognized that the block data BD1 is FAT data, a second signal S3 indicating this is supplied to the read / write control unit 33.

  On the other hand, the read / write control unit 33 switches the first switch unit 34 to the data recording side terminal a, and then controls the cache memory 11 based on the data recording destination signal S 1 from the personal computer 2, thereby The block data BD1 stored in the disk 11 is recorded on the disk 4.

  At this time, when the second signal S3 is supplied from the FAT determination unit 31 instead of the first signal S2, the read / write control unit 33 determines that the block data BD1 is FAT data based on the second signal S3. Recognizing that there is, and at the timing when the block data BD1 is recorded on the disk 4, the expanded SRB data expanded in the cache memory 11 is also written back to the DDT area of the disk 4.

  Thereafter, when the personal computer 2 supplies a data read command signal S4 indicating the address of the block data BD1 to the recording / reproducing apparatus 1 in order to read the block data BD1 recorded on the disk 4, the recording / reproducing apparatus at this time. 1 supplies the data read command signal S4 to the read / write control unit 33 and also to the SRB control unit 32 via the FAT determination unit 31.

  At this time, the SRB control unit 32 refers to the expanded SRB data (FIG. 5B) expanded in the cache memory 11, and thereby the cluster number # 4 corresponding to the address indicated in the data read command signal S4. Data read request for requesting to read from the disk 4 the block data BD1 corresponding to the data read command signal S4 when recognizing that “1” indicating the data recorded cluster is associated as the bit of The signal S5 is supplied to the read / write control unit 33.

  On the other hand, when it is recognized that “0” indicating the data unrecorded cluster is associated with the bit of the cluster number # 4, the SRB control unit 32 generates “0” data and uses this. A “0” data generation request signal S 6 for requesting the personal computer 2 to acquire is supplied to the read / write control unit 33.

  When the read / write control unit 33 receives the data read request signal S5 from the SRB control unit 32, the read / write control unit 33 switches the first switch unit 34 and the second switch unit 35 to the data read side terminals b and c, and then the personal computer The block data BD1 is read from the disk 4 based on the address indicated in the data read command signal S4 from 2 and stored in the cache memory 11. Next, the read / write control unit 33 notifies the personal computer 2 that data corresponding to the data read command signal S4 (in this case, the block data BD1) has been stored in the cache memory 11, and the personal computer 2 responds accordingly. The computer 2 acquires the block data BD1 from the cache memory 11.

  When the read / write control unit 33 receives the “0” data generation request signal S6 from the SRB control unit 32, the read / write control unit 33 controls the “0” data generation unit 36 to generate “0” data, and then the second switch The generated “0” data is stored in the cache memory 11 by switching the unit 35 to the “0” data generation unit side terminal d. Next, the read / write control unit 33 notifies the personal computer 2 that the data corresponding to the data read command signal S4 (in this case, “0” data) has been stored in the cache memory 11, and accordingly, The personal computer 2 obtains this “0” data from the cache memory 11.

(6) Operation and Effect In the above configuration, the recording / reproducing apparatus 1 records SRB data indicating a cluster (data recorded cluster) in which data has already been recorded on the disk 4.

  As a result, when the recording / reproducing apparatus 1 reads data from the disk 4, the data recorded cluster and the data that has been recorded are recorded based on the SRB data recorded on the disk 4. It is possible to discriminate a non-data unrecorded cluster from being accessed, and thus it is possible to reliably avoid accessing a data unrecorded cluster from which no signal can be read.

  As a result, it is possible to realize the recording / reproducing apparatus 1 that can reliably avoid the occurrence of a read error due to the use of the disk 4 that has not been initialized.

  Furthermore, when the address input as a data read command from the personal computer 2 designates a data unrecorded cluster, the recording / reproducing apparatus 1 of the present embodiment does not access the data unrecorded cluster, “0” data indicating that no data is recorded in the unrecorded cluster is sent to the personal computer 2. As a result, the recording / reproducing apparatus 1 does not access a data unrecorded cluster in which no signal is recorded, so that it is possible to avoid a read error and data is stored in the cluster corresponding to the data read command. It is possible to make the personal computer 2 recognize that it is not recorded.

  According to the above configuration, since the SRB data indicating the cluster in which the data has already been recorded is recorded on the disk 4, the SRB data recorded on the disk 4 is read when the data is read from the disk 4. Based on the data, it is possible to discriminate between a data recorded cluster in which data has been recorded and a data unrecorded cluster in which no data has been recorded, and thus to a data unrecorded cluster from which no signal can be read. Access can be reliably avoided.

(7) Other Embodiments In the above-described embodiment, the case where the disk 4 corresponding to the MD is applied as the disk-shaped recording medium has been described. However, the present invention is not limited to this, and for example, a CD (Compact Various other disc-shaped recording media such as Disc) may be applied.

  In the above-described embodiment, the recording / reproducing apparatus 1 set at the second SRB data write-back timing synchronizes with the timing at which the FAT data is recorded on the disk 4, and develops the developed SRB data on the disk 4. However, the present invention is not limited to this, and the developed SRB data is stored in the DDT area of the disk 4 at the timing when the data for the processing unit of the personal computer 2 (document data D1) has been recorded. If the data can be written back, the expanded SRB data may be written back to the disk 4 in synchronism with the timing of recording other data such as directory entry data on the disk 4.

  Furthermore, in the above-described embodiment, the case where the storage unit 12 and the system controller unit 13 that controls the storage unit 12 are applied as the first recording unit that records data supplied from the outside on the disk-shaped recording medium has been described. The present invention is not limited to this, and various other configurations can be applied.

  Furthermore, in the above-described embodiment, a data recorded portion (data recorded cluster) in which data has already been recorded by the first recording means in the recording area (recordable area) in the disc-shaped recording medium (disc 4) is shown. Although the case where the storage unit 12 and the system controller unit 13 that controls the storage unit 12 are applied as the second recording unit that records the recording management information (SRB data) on the disc-shaped recording medium (disc 4) has been described. Not limited to this, various other configurations can be applied.

  Furthermore, in the above-described embodiment, the case where the storage unit 12 and the system controller unit 13 for controlling the storage unit 12 are applied as data reading means for reading data by accessing the recording area of the disk-shaped recording medium has been described. The present invention is not limited to this, and various other configurations can be applied.

  Further, in the above-described embodiment, the case where the system controller unit 13 is applied as a control unit that controls the data reading unit so that the data reading unit does not access a data non-recorded portion (data unrecorded cluster) has been described. However, the present invention is not limited to this, and various other configurations can be applied.

  Further, in the above-described embodiment, the case where the recording / reproducing apparatus 1 that executes the data recording / reproducing process on the MD is applied as the data recording apparatus and the data reading apparatus. However, the present invention is not limited to this. Various other recording or reproducing devices such as a CD player may be applied as long as they perform data recording or data reproduction processing on a disk-shaped recording medium.

  The present invention can be used in a recording / reproducing apparatus that performs data recording / reproducing processing on a disk-shaped recording medium.

It is a basic diagram which shows the structure of the recording / reproducing apparatus by this Embodiment. It is a basic diagram which shows the disk structure and data format of 1st next generation MD. It is a basic diagram which shows the disk structure and data format of 2nd next generation MD. It is a basic diagram which shows the structure (1) of SRB data. It is a basic diagram which shows the structure (2) of SRB data. It is a basic diagram with which it uses for description of a 1st SRB data write-back timing. It is a basic diagram with which it uses for description of the 2nd SRB data write-back timing. It is a basic diagram with which it uses for description of a 3rd SRB data write-back timing. It is an approximate line figure used for explanation of the 4th SRB data write-back timing. It is a block diagram which shows the functional block structure of a recording / reproducing apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Recording / reproducing apparatus, 2 ... Personal computer, 4 ... Disk, 11 ... Cache memory, 12 ... Storage part, 13 ... System controller, 15A ... ROM.

Claims (10)

First recording means for recording data supplied from outside on a disk-shaped recording medium;
Second recording means for recording, on the disc-shaped recording medium, recording management information indicating a data recorded portion in which the data has already been recorded by the first recording means in the recording area of the disc-shaped recording medium. A data recording device characterized by that. The second recording means includes
Each time the first recording unit finishes recording the data for the processing unit of the external device out of the data supplied from the external device onto the disk-shaped recording medium, the recording management information is stored in the disk-shaped recording medium. The data recording apparatus according to claim 1, wherein recording is performed. The second recording means includes
When the FAT (File Allocation Table) information supplied together with the data is recorded on the disk-shaped recording medium, the first recording means has recorded the data for the processing unit of the external device on the disk-shaped recording medium. The data recording apparatus according to claim 2, wherein the recording management information is determined and recorded on the disc-shaped recording medium. The data is recorded in the recording area, and the data is read by accessing the recording area of the disc-shaped recording medium on which the recording management information indicating the recorded part of the recording area is recorded. Data reading means;
Control means for controlling the data reading means so that the data reading means does not access a data unrecorded portion of the recording area recognized based on the recording management information. Reading device. The control means includes
When a data read command signal for instructing to read data from the unrecorded portion of the recording area is input from an external device, the data reading means is controlled so as not to access the unrecorded portion of data. 5. The data reading device according to claim 4, wherein the external device is notified that no data is recorded in the data non-recorded portion. A first step of recording externally supplied data on a disc-shaped recording medium;
A second step of recording, on the disc-shaped recording medium, record management information indicating a data-recorded portion in which the data has already been recorded in the first step in the recording area of the disc-shaped recording medium. A data recording method characterized by the above. In the second step,
The recording management information is recorded on the disk-shaped recording medium every time the data for the processing unit of the external apparatus among the data supplied from the external apparatus in the first step is recorded on the disk-shaped recording medium. The data recording method according to claim 6, wherein: In the second step,
When the FAT information supplied together with the data in the first step is recorded on the disc-shaped recording medium, it is determined that the data for the processing unit of the external device has been recorded on the disc-shaped recording medium, and the recording management The data recording method according to claim 7, wherein information is recorded on the disc-shaped recording medium. By causing the data reading means to access the recording area of the disc-shaped recording medium in which data is recorded in the recording area and recording management information indicating the recorded part of the recording area is recorded. A first step of reading the data;
And a second step of controlling the data reading unit so that the data reading unit does not access a data unrecorded portion of the recording area recognized based on the recording management information. To read data. In the second step,
When a data read command signal for instructing to read data from the unrecorded portion of the recording area is input from an external device, the data reading means is controlled so as not to access the unrecorded portion of data. The data reading method according to claim 9, wherein the external device is notified that data is not recorded in the data non-recorded portion.

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