WO2002073614A1

WO2002073614A1 - Data recording method and recording apparatus

Info

Publication number: WO2002073614A1
Application number: PCT/JP2002/002152
Authority: WO
Inventors: Akira Hirai
Original assignee: Sony Corporation
Priority date: 2001-03-09
Filing date: 2002-03-07
Publication date: 2002-09-19
Also published as: JP2002269746A

Abstract

A data recording method and recording apparatus are disclosed for recording data on a disc-shaped recording medium which has been subjected to a finalization processing. An unfinalization processing is performed to erase read-in information and read-out information at the last session of the disc-shaped recording medium and data is written starting at a position of the read out information which has been erased.

Description

TECHNICAL FIELD The present invention relates to a data recording method and a recording apparatus for recording data on a rewritable disk-shaped recording medium by a sequential write method and reproducing the data. The present invention relates to a data recording method and a recording device for additionally writing data from a session erased by an unfinalizing process when a disc-shaped recording medium has been subjected to a finalizing process. Sony and Philips announce CD-RM (CD-Read Only Memory) in 1983, following CD-DA (Compact Disc Digita 1 Audio) in 198 However, CD-ROMs have the advantage of having a large storage capacity and reading out data in a non-contact manner without wear or damage. Further, the CD-ROM does not cause a head crash as compared with a recording medium such as a contact type magnetic tape. Thus, CD-ROM is a disc-shaped recording medium that is superior to other media.

Here, the CD-DA standard is described. In this standard, as shown in Fig. 1, a disc-shaped recording medium is composed of segments called “Lead In” information j, “Program Area”, and “Lead Out” information. Stipulates that The process from the lead-in information to the lead-out information is called a session in the CD-ROM standard. The program area is the part of the disk-shaped recording medium that actually contains computer data and digital audio data (hereinafter referred to as data). The CD-DA standard states that this data can be split into up to 99 tracks, with a two second gap between each track. Lead-in is track index information It contains TOC (Table Of Contents).

For all uses of CD, it is determined that data should be placed on a disk in units called sectors. The size of one section is 2 352 byes. This includes a data area of 2,048 bits, a header for a sector, a sub header, an error detection code, and the like. The data area is also handled as a logical block, but is usually handled as a user area of 2048 by tes. Within each session, each logical block has a set of logical addresses. A device that reproduces data from a disk-shaped recording medium accesses each sector using this logical block number (LBN). The disc-shaped recording medium records data on each track in the program area, but needs to be formatted in a predetermined format. Generally, an ISO9666 file system (hereinafter, referred to as ISO9660) is used. Here, the ISO 9660 will be described. ISO 9660 is a file system originally created for press-type disc-shaped recording media such as CD-R0M. As shown in Fig. 2, the file structure of ISO9660 is root directory → directory → file, which is a so-called hierarchical directory structure that reaches the file from the root. It is managed by a volume descriptor (VD, Volume Description). The VD includes a primary volume descriptor (PV Ds Primary Volume Description), a secondary volume descriptor (SVD, Supplementary Volume Description), a volume partition descriptor (VPD, Volume Partition Descriptor), and the like. In addition to the directory structure described above, the ISO 96660 has a path table which is a unique search table indicating all disk-shaped points.

As shown in FIG. 3, the structure of the ISO 9660 section is composed of a PVD, pasteable and directory structure.

The PVD resides in the first track of the session, sector 16 regardless of whether the CD-ROM is a single session consisting of one session or a multi-session consisting of multiple sessions. I have. PVDs are logical addresses of other data structures such as path tables and directories. Pointing to. The path table is used, for example, by a computer's OS (Operating System) when searching for files, so that the desired directory can be found without having to read all directories. The CD-ROM enables high-speed reading to files using this path table. Also, the paste table indicates the location of all directories including the root directory in the disk-shaped recording medium. The root directory consists of a file structure and substructures pointing to the directory structure.

The recording of the overnight data by ISO 9660 is characterized by the fact that the pressing process takes time and effort, but does not impose a burden on the computer CPU when reproducing the data.

In recent years, CD-R (CD Recodable), a data recordable medium, and CD-RW (CD Rewritable), a rewritable medium, have appeared. CD-R is a disc-shaped recording medium in which the recording layer is made of an organic photoreactive dye film, and information is recorded by irradiating this recording layer with a high-temperature laser beam. The CD-R allows new data to be added after data has been recorded, and because it is a write-once, which cannot be rewritten, the physical data / track is divided into multiple sessions. Information is recorded by so-called multi-session additional recording. In the case of CD-RW, for example, the recording layer is made of a phase change material of Ag-In-Sb-Te, and the recording layer is irradiated with a high-temperature laser beam to record information. It is a recording medium. Specifically, CD-RW utilizes the phase change, which is the physical transfer between crystalline and noncrystalline.

The disk-shaped recording medium such as the CD-ROM described above continuously records data spirally from the inside to the outside of the disk. Such a recording method is called a sequential writing method. The sequential writing method includes DAO (Disk At Once), TA 0 (Track At Once), and packet write. DAO is a recording method that records data for one disk at a time, and does not allow additional data to be added later. TAO is a recording method that records data overnight on a track basis and allows additional recording of data later. The socket light is a recording method that can record data in smaller units than the track of the TAO, and can additionally record data later. TAO can record only up to 99 tracks according to the CD-DA standard described above, but packet write is an easy-to-use recording method with no limit on the number of packets. However, the ISO 9660 file system is not suitable for the above-described packet-light recording method of recording in packet units. Therefore, OSTA (Optical Storage Technology Association) has formulated a UDF (Universal Disc Format) file system as a standard related to reproduction and / or recording of CD-R and CD-RW.

Here, the UDF will be described. As described in the CD-R / RW Official Guide Book (written by Orange Forum, published by EXCEED 'Press), a disc-shaped recording medium conforming to UDF is used when writing data. You are using writing. Packets There are two types of packets used for lighting: fixed length and variable length. When data is written on a CD-R, for example, for one packet, there are four different types: one link block, four run-in blocks, one data, and two run-out blocks. Information is continuously recorded on CD-R. The difference between fixed-length and variable-length packets is that the data segment part has a fixed size or a variable size.

In UDF, instead of directly managing directory and file management information as actual recording locations, a file identifier (FID, File Identifier Descriptor), a virtual allocation table (VAT, Virtual Allocation Table), a file entry I CB (File Entry Information Control Block) and so on.

VAT is a technology that treats a sequential write type disk-shaped recording medium virtually like a random read-type disk-shaped recording medium. The virtual address corresponding to the logical address is managed as a correspondence table.

Therefore, the UDF file system indirectly refers to directory and file location information. The position of the VAT can be freely located in the packet structure, but the virtual allocation table I CB pointing to the VAT (VAT I CB) Is determined so as to be always located at a position returned by a linking area (Linking Area) from the last sector recorded on the disk-shaped recording medium. The linking area is a joint area of 7 blocks between adjacent packets.

In a file system conforming to the UD, the latest VAT ICB is always written at the position returned by the 7 blocks prepared as linking areas from the final address position of the disk. Therefore, the UDF can first convert the virtual address to the real address by reading the VAT pointed to by this VATICB.

A CD-R or CD-RW on which data has been recorded in the above-mentioned UDF file format can be recorded and / or played with a CD-R or CD-RW drive, but is compatible with the ISO9660 file format. CD-ROM drives cannot play back data.

Therefore, the CD-R or CD-RW drive performs a finalizing process of converting a UDF to an ISO9660 in a file format. In the finalizing process, an IS〇 9660 conversion table is recorded in the first track of data recorded in UDF, lead-in information is recorded in a predetermined position on a CD-R or CD-RW, and This is the process of recording readout information at the end of data.

If new data is added after the finalization process described above, even if it is a rewritable disc recording medium, it cannot be added to the previous data area, and it is necessary to record it in the new data area. Yes, there is a problem that additional data can be added only in multisession.

In addition, in the multi-recording, there is a problem that a large number of lead-in information and read-out information exist on a single disk-shaped recording medium, which limits a data recording area. DISCLOSURE OF THE INVENTION The present invention has been proposed in view of the above-described circumstances, and when additional writing is performed on a rewritable disc-shaped recording medium after finalization processing, the disc-shaped An object of the present invention is to provide a data recording method and apparatus for performing an unfinalizing process on a final section of a recording medium and additionally writing data from the position of the readout information erased by the unfinalizing process.

The present invention proposed to solve the above-described problem records data in a data area of a rewritable disc-shaped recording medium by a sequential write method, and records lead-in information in a predetermined location of the disc-shaped recording medium. This is a data recording method for performing finalization processing for recording readout information at the end of data. When data is added to a data area, the above-mentioned finalization processing is performed on a disc-shaped recording medium. Performs an unfinalizing process for erasing read-in information and read-out information of the last session of the disc-shaped recording medium, and additionally writes data from the position of the erased read-out information.

In such a data recording method, when data is additionally recorded on a rewritable disc-shaped recording medium which has been subjected to finalization processing, unfinalization processing is performed on the disc-shaped recording medium to erase lead-in information and lead-out information. Then, data is added from the position of the read read information that has been erased.

A data recording apparatus according to the present invention records data in a data area of a rewritable disc-shaped recording medium by a sequential write method, records lead-in information at a predetermined location on the disc-shaped recording medium, and reads a lead letter at the end of the data. What is claimed is: 1. A data recording apparatus having a finalizing processing function for recording information, comprising: finalizing processing means for erasing read-in information and lead-out information of a final section of a disc-shaped recording medium; It is provided with data recording means for adding data to the data area, and when data is additionally recorded in the data area, if the disc-shaped recording medium has been finalized, the unfinalized processing means writes the data to the disc-shaped recording medium. Erase the recorded lead-in and lead-out information, Data is additionally written in the data area by the data adding means.

This data recording device is provided with unfinalizing processing means and data appending means. When appending data to a rewritable disc-shaped recording medium which has been subjected to finalizing processing, the disc is used by the unfinalizing processing means. Erases the readout information and leadout information on the linear recording medium, and erases Add one night from the position of the window information.

Further objects of the present invention and specific advantages obtained by the present invention will become more apparent from the description of the embodiments described below with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a data block structure on a disk-shaped recording medium. FIG. 2 is a diagram showing a basic file structure of the ISO 9660.

FIG. 3 is a diagram showing the structure of the section of ISO 9660.

FIG. 4 is a block diagram showing a configuration of a digital still camera to which the present invention is applied.

FIG. 5 is a flowchart showing an example of a recording operation of the digital still camera to which the present invention is applied.

6A to 6C are diagrams showing a block structure of a disc-shaped recording medium by an unfinalizing process of a digital still camera to which the present invention is applied.

FIG. 7 is a diagram showing a block structure of a disk-shaped recording medium when data is additionally recorded by an unfinalizing process, a data additional recording process, and a finalizing process of a digital still camera to which the present invention is applied.

8A and 8B are diagrams showing unused areas that can be secured when data is additionally recorded by a digital still camera to which the present invention is applied. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The present invention is applied to, for example, a digital still camera (DSC) 1 as shown in FIG.

DSC 1 is based on a file system compliant with UDF (Universal Disc Format), and records recorded image data on rewritable disc-shaped recording media (hereinafter referred to as disc-shaped recording media). Reproduction, deletion and additional recording When recording, reproducing, erasing, and appending a file in which image data is stored, the VAT (Virtual Allocation Table) recorded at the end of the last session of the disc-shaped recording medium is read. It makes it possible to refer to a previously recorded day.

UDF is a file system that can be used between various media such as CD-R (Compact Disc Recordable) _s CD-RW (Compact Disc Rewritable) and CD-M〇 (Compact Disc Magnet Optical). Technology Association).

The UDF uses a file entry information control block (ICB) as a main data structure. UDF also has its own ICB for every file and directory.

VAT is a so-called matting table that assigns a sequential number called a virtual reference to each file recorded on a disk-shaped recording medium. In a file system conforming to the ISO 9660 file system, each file or directory on a disk-shaped recording medium is directly referred to by a logical address, but in the UDF, a virtual address as described above is referred to. . The virtual address does not change because the packet is recorded on the disk-shaped recording medium and is referenced by the VAT CB even if the logical address of the file changes. In the UDF, it is specified that the VAT ICB be placed at the physical address recorded in the last session of the disc-shaped recording medium. The VAT is divided and placed on multiple extensions, while the VAT ICB contains a list of VAT extensions. Therefore, in UDF, if the file is modified in any way, the entire series of file pointers need not be changed, and finally the changed file can be reached only by changing the VAT ICB. . The term “extension” refers to a set of programs written continuously on a disc-shaped recording medium such as a CD-ROM.

UDF enables recording using any OS (Operating System) to ensure compatibility and provide an environment that can be used interchangeably, and allows recorded files to be stored in any file without using a special read program. Aim to enable playback on 0S And

The DSC 1 includes a photographing unit 10, an image signal processing unit (Image Signal Processor) 11, a display unit 12, an OP (Optical Pickup) unit 13, an RF signal processing unit 14, and a servo signal. Processing unit 15, analog filter processing unit 16, signal processing unit 17, spindle driver '18, thread driver' 19, tracking driver 20, focus driver 21, It has a spindle motor 22, a thread motor 23, and a control unit 24, and records, reproduces, erases, and additionally records image data shot on a disk-shaped recording medium 25.

The photographing unit 10 supplies the photographed image data to the image signal arithmetic processing unit 11. The imaging unit 10 includes a lens unit 30 for capturing an image of a subject, a CCD 31, an S / H circuit 32, and an A / D converter 33. The CCD 31 generates an image signal from the image of the subject supplied from the lens unit 3 ◦ and supplies the generated image signal to the S / H circuit 32. The 3/11 circuit 32 samples and holds the image signal and supplies it to the A / D converter 33. The / 0 converter 33 converts the image signal into a digital signal and supplies the digital signal to the image signal operation processing unit 11.

The image signal calculation processing unit 11 is connected to the imaging unit 10, the display unit 12, the signal processing unit 17, and the control unit 24. The image signal arithmetic processing unit 11 is controlled by the control unit 24, and converts the digital image signal supplied from the photographing unit 10 into a color standard form conversion from RGB signals to color difference / luminance signals, and white balance. Performs image processing such as gamma correction and reduced image processing. The processed digital image signal is supplied to the signal processing unit 17 and the display unit 12.

The display unit 12 displays the digital image signal supplied from the image signal operation processing unit 11. The display unit 12 is, for example, a liquid crystal display. The OP unit 13 is connected to the RF processing unit 14, the signal processing unit 17, the tracking driver 20, and the focus driver 21. 〇P section 13 has an objective lens, laser diode, laser diode dryno (LD dri), photodetector IC (PD IC), half mirror, etc., and detects optical signals. And supplies it to the RF processor 14. Also, when recording data on the disk-shaped recording medium 25, the P section 13 is used to control the laser blinking / driving signal necessary for pitting, the driving signal, and the optimal laser intensity and blinking. A light strategy signal or the like indicating a value is supplied by the signal processing unit 17. Further, the 0P section 13 is controlled by the tracking driver 20 and the focus driver 21.

The RF processing unit 14 is connected to the OP unit 13, the servo signal processing unit 15, and the signal processing unit 17. The RF processing unit 14 samples and holds the eight signals consisting of the beam signal, the side, and the main detected from the OP unit 13 and performs arithmetic processing. Signals such as focus error (FE, focus error), tracking error (TE, Tracking Error), mirror (MIRR, Mirror), AT IP (Absolute Time Pregroove), and read main signal are generated from the signal. The RF processing unit 14 supplies the FMD T (Frequecy Modulation Data) _s FMCK (Frequecy Modulation Clock), FE, and TE of the generated signals to the servo signal processing unit 15 and detects the signal detected by trial writing. The optimum power (OPC, Optical Power Calibration) signal and laser blinking / driving signal are supplied to the signal processing unit 17 and the MI RR is supplied to the control unit 24.

The servo signal processing unit 15 is connected to the RF processing unit 14 and the analog filter processing unit 16 and is controlled by the control unit 24. The servo signal processing unit 15 receives the FMD T, FMCK, cinch and 1 ^ from the RF processing unit 14, generates signals for controlling various servos under the control of the control unit 24, and converts the above signals. Analog fill Supplied to evening processing section 16.

The analog filter processing unit 16 is connected to the servo signal processing unit 15, spindle driver 18, thread driver 19, focus driver 21, and tracking driver 20. The analog fill processing section 16 generates analog signals from various servo control signals supplied from the servo signal processing section 15 and converts the analog signals into spindle dryino 18, thread dryno 19, tracking driver 20. And the focus driver 21.

The signal processing unit 17 is connected to the OP unit 13 and the RF processing unit 14, and is controlled by the control unit 24. The signal processing unit 17 is controlled by the control unit 24, supplied with the OPC from the processing unit 14, and performs processing such as CIRC (Cross Interleaved Read-Solomon Code) decoding and encoding, light strategy, and ADD r decoding. Work. In addition, when recording data on the disk-shaped recording medium 25, the signal processing unit 17 supplies the OP unit 13 with a laser blinking signal, a drive signal, a signal indicating an optimum value of laser intensity, and the like.

The spindle dryno 18 is connected to the analog filter processing section 16 and the spindle motor 22, and controls the rotation of the spindle motor 22 based on a signal supplied from the analog filter processing section 16. . The thread driver 19 is connected to the analog filter processing unit 16 and the thread motor 23, and based on a signal supplied from the analog filter processing unit 16, the thread operation of the thread mode 23 is performed. Control. The tracking driver 20 is connected to the analog filter processing section 16 and the OP section 13 and operates the OP section 13 based on a signal supplied from the analog filter processing section 16. Then, the position of the beam spot irradiated on the disk-shaped recording medium 25 is controlled. The focus driver 21 is connected to the analog filter processing section 16 and the OP section 13, and controls the OP section 13 based on a signal supplied from the analog filter processing section 16 to record the disc-shaped recording medium 25. The focal position of the beam is controlled by moving the beam vertically.

The spindle motor 22 is connected to the spindle driver 18 and rotates the disk-shaped recording medium 25 based on a signal supplied from the spindle driver 18. The thread module 23 is connected to a thread dryno 19 and performs a thread operation of the OP section 13 based on a signal supplied from the thread dryno 19.

Ό.

The control unit 24 includes a CPU, a program memory, a dynamic random access memory (DRAM), and a static random access memory (SRAM) .The image signal calculation processing unit 11 and the servo signal processing unit 15 and the signal processing unit 17 are controlled. The program memory stores programs for performing various processes. The DRAM has a work area to temporarily store VAT ICB and various data. The control unit 24 controls reading and writing of the VAT CB.

The disc-shaped recording medium 25 is a rewritable recording medium on which recording, reproduction, erasing and additional recording are performed based on a UDF-compliant file system. For example, CD-RW.

Here, a series of recording operations in which the DSC 1 records data on the disk-shaped recording medium 25 will be described with reference to the flowchart shown in FIG. Note that CD-RW is used as the disc-shaped recording medium 25.

In step ST1, DSC 1 determines whether or not a recorded CD-RW is set as a recording medium. If the recorded CD-RW is set, go to step ST3. If an unused CD-RW is set, go to step ST2.

In step ST2, the DSC 1 performs an initialization process on the CD-RW into a UDF file format.

In step S T3, D S C 1 photographs the subject.

In step ST4, DSC1 records the data captured in step ST3 in CD-RW. At this time, the data is recorded in the UDF file system.

In step ST5, DSC1 determines whether to photograph another subject. When photographing another subject, the process returns to step ST3. When not photographing another subject, the process proceeds to step ST6.

In step ST6, the DSC 1 determines whether or not to perform finalization processing on the CD-RW. When performing the finalizing process, proceed to Step ST7.

In step ST7, the DSC 1 finalizes the CD-RW.

Here, the finalizing process will be described. For example, a CD-RW whose data is recorded in UDF file format and has not been finalized can be played back on a general personal computer (PC, Personal Computer) overnight. Can not. This is because PCs do not support UDF. Therefore, in order to play back the data recorded on the CD-RW on the PC, it is necessary to convert the file format of the CD-RW to a file system such as IS09660 supported by the PC. is there. This conversion work This is called initialization processing.

Here, the writing method of the UDF will be described. A rewritable disc-shaped recording medium such as CD-RW generally employs a random write method using a fixed-length packet when recording data by UDF. As in the case of the write-once type disc-shaped recording medium such as a CD-R, a sequential write method using a variable-length packet is adopted. In the packet write, since data is recorded in the user area of the CD-RW, read-in information and read-out information are not recorded. However, the CD-ROM cannot recognize the CD-RW unless the lead-in information and the lead-out information are recorded. In the finalizing process, work for adding the lead-in information and the lead-art information is also performed.

In step ST8, the DSC 1 determines whether to photograph another subject. When photographing another subject, the process proceeds to step ST9.

In step ST9, the DSC 1 determines whether or not to perform an unfinalizing process for deleting a redundant area such as lead-in information and read-file information generated by the finalizing process performed in step ST7, on the CD-RW. . If the CD-RW is not to be unfinalized, the process returns to step ST3. If the CD-RW is to be unfinalized, the process proceeds to step ST10. In step ST10, DSC1 performs an unfinalizing process on CD-RW. Then, the process returns to step ST3.

Here, the unfinalizing process will be described. As shown in FIG. 6A, the CD-RW has a first session delimiter (hereinafter referred to as “lead-in information”) and an IS09660 conversion table recorded at the beginning of the data. A so-called finalization process is performed at the end of which is recorded a second section break (hereinafter referred to as “lead-out information”). Use the following SCSI command to check whether the CD-RW has been finalized as described above. DSC 1 issues an RDI (Read Disc Infomation) command to the CD-RW, and the DS (Disc Status) command, which is the return value of the RDI command, is a control command and the RDI command If it is confirmed that the Last Session Status (LSS) in the return value of the CD is Com P 1 ete, the CD-RW is finalized. Make sure that

It is confirmed that the CD-RW has been finalized as described above, and as shown in FIG. 6B, the lead-in information and the lead-out information are deleted. Use the following SCS I command to delete the lead-in and lead-out information. The DSC1 issues a "B1ank" command of the ULS (Unclose the Last Session) mode to the CD-RW.

After the read-in information and the read-out information of CD_RW are erased as described above, the IS09600 conversion table is erased as shown in FIG. 6C. To erase the ISO9660 conversion table, use the following SCSI command. The DSC1 issues a "Blank" command to the CD-RW in the ": Blank" command in the ULS mode. The command may be other than the SCS I command as long as it can perform the above-described operation.

If the CD-RW adds new data to the previously recorded data in step ST7, as shown in Fig. 7, the read-in information and the ISO 9660 conversion table are placed in front of the data area. Is recorded, and the lead-out information is recorded behind the data area. Also, the lead-in information and the lead-out information are paired, and it is not possible to erase only one of them.

As described above, as shown in FIG. 8A and FIG. 8B, DSC 1 uses the read-in information after the 2nd section, the ISO 9660 conversion table, The readout information can be used as a data area. For example, by combining the first and second sections into one session, it was necessary to generate the second section with the second MB of 9.216 MB. A total of 1 3.324 MB of lead-in information and 4.108 MB of second lead-out information can be used as the overnight area. Note that there are n (n> 1) sessions, and the total T of the lead-in information and the lead-out information when the sessions are considered as one session is as follows.

T = 1 3.324 x (n-1) MB

This total T can be spent in the data area.

The DSC 1 configured in this way is finalizable and rewritable. When the data is additionally recorded on a functional disk-shaped recording medium 25, the lead-in information, the read-out information, and the ISO9660 conversion table are erased by the unfinalization process, and the data is additionally recorded. However, it is possible to use the area of the management information after the 2nd session which has been required conventionally as the data area. INDUSTRIAL APPLICABILITY As described above, in the data recording method according to the present invention, data is recorded by a sequential write method, and data is additionally recorded on a rewritable disc-shaped recording medium that has been subjected to finalization processing. In this case, an unfinalizing process is performed and data is additionally recorded, so that an area for management information that has been conventionally required can be used as a data area.

In addition, since the data recording device according to the present invention includes the unfinalizing processing means and the data recording means, the rewritable disc-shaped recording on which the data is recorded by the sequential write method and which has been finalized is performed. When data is additionally recorded on a medium, unfinalizing processing is performed on the disc-shaped recording medium by the unfinalizing processing means, and data is additionally recorded by the data recording means. The information area can be used as a data area.

Claims

The scope of the claims

1. Record data in the data area of the rewritable disc-shaped recording medium in a sequential write manner, record lead-in information at a predetermined location on the disc-shaped recording medium, and record read-out information at the end of the data. A data recording method for performing a finalizing process,

When appending data to the data area, if the disc-shaped recording medium has been subjected to the finalizing process, an unfinalizer for erasing lead-in information and lead-out information of the last session of the disc-shaped recording medium. Rise process,

A data St3fe method, wherein data is added from the position of the erased readout information.

2. When appending data to the data area, if the disc-shaped recording medium has been subjected to the finalizing process, add the data to the last section of the disc-shaped recording medium or end the last session. 2. The data recording method according to claim 1, wherein a selection is made as to whether a new session is to be created and added to said new session.

3. UDF (Universal Disc Format) is used to record data in the sequential area by using the Universal Disc Format (UDF) in the data area of the disc-shaped recording medium. This is a data recording method in which lead-in information is recorded at a predetermined location on a recording medium, an ISO9660 conversion table is recorded at the beginning of the data, and finalization processing is performed to record the lead-out information at the end of the data. hand,

When data is additionally written in the data area, if the disc-shaped recording medium is finalized according to the file format of the IS-9660 file system, lead-in information, lead-out information and IS0 9 6 6 0 Perform unfinalization processing to delete the conversion table,

Sequential write method of UDF from the position of the erased read format information 2. The data recording method according to claim 1, wherein the data is additionally recorded in the data.

4. Data is recorded in the data area of the rewritable disc-shaped recording medium by the sequential write method, lead-in information is recorded at a predetermined location of the disc-shaped recording medium, and a readout is added at the end of the data. A data recording device having a finalization processing function for recording information,

Unfinalizing processing means for erasing lead-in information and lead-out information of the last section of the disc-shaped recording medium;

Data adding means for additionally writing data from the position of the read-out read information,

At the time of additionally writing data in the data area, if the disc-shaped recording medium has been subjected to the finalizing process, the lead-in information and read-in information recorded on the disc-shaped recording medium by the unfinalizing processing means. Erase the data information and write data in the data area by the data writing means

A data recording device, characterized in that:

5. When appending data to the data area, if the disc-shaped recording medium has been subjected to the finalizing process, add it to the last session of the disc-shaped recording medium or add the end of the last session. 5. The overnight recording apparatus according to claim 4, further comprising: an additional recording selecting means for selecting whether to create a new session and additionally record the new session.

6. UDF (Universal Disc Format) is used in the data area of the disc-shaped recording medium to record data by the sequential write method, and the disc-shaped recording is performed according to the file format of the ISO9660 file system. A data recording device having a finalizing process function for recording lead-in information at a predetermined location on a medium, recording an ISO9660 conversion table at the beginning of the data, and recording lead-out information at the end of the data. And

Unfinalizing processing means for erasing lead-in information, lead-at information, and ISO 9660 conversion table from a disc-shaped recording medium that has been finalized in accordance with the file format of the IS09660 file system. And the sequential write method of the UDF from the position of the read And data appending means for appending data with

When data is additionally written to the disk area, if the disc-shaped recording medium has been subjected to the finalizing process, the lead-in information recorded on the disc-shaped recording medium by the unfinalizing processing means. 5. The data recording apparatus according to claim 4, wherein the readout information and the ISO9660 conversion table are erased, and data is additionally recorded in the data area by the data appending means.