JP2002269746A - Data recording method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To record data additionally on a disk-like recording medium to which the finalizing process has been applied. SOLUTION: Data is recorded additionally by applying the unfinalized process for erasing the read-in information and read-out information of the final session of the disk-like recording medium and starting the writing at the position of the erased read-out information.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recording method and 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 apparatus for additionally writing data from a session deleted by an unfinalizing process when the finalizing process has been performed.

[0002]

2. Description of the Related Art Sony and Philips have established a CD-DA (Compact Disk Digita) in 1980.
l Audio), followed by CD-ROM in 1983
(CDRead Only Memory).
The CD-ROM has a large storage capacity and has an advantage that there is no wear and no damage because data is read out in a non-contact manner. Further, a CD-ROM does not cause a head crash as compared with a recording medium such as a contact type magnetic tape. As described above, the CD-ROM is a disc-shaped recording medium that is superior to other media.

[0003] Here, Red, which is a CD-DA standard, is described.
Book will be described. In RedBook, a disc-shaped recording medium is referred to as “lead-in (L
Ead In) information ”,“ Program area (Progr)
am Area) "," Lead Out "
t) Information ”. In the Yellow Book (CD-ROM standard), the process from the lead-in information to the lead-out information is called a session. The program area is a part of the disk-shaped recording medium that actually contains computer data and digital audio data (hereinafter, referred to as data). Red Book specifies that this data can be split into up to 99 tracks, with a 2 second gap between each track. The lead-in includes TOC (Table Of Contents) that is track index information.

[0004] In all uses of the CD, it is determined that data is arranged on a disk in units of sectors. The size of one sector is 2352 bytes.
tes. This includes a data area of 2048 bytes, a header of a sector, a subheader, an error detection code, and the like. The data area is also treated as a logical block, but is usually treated as a user area of 2048 bytes. Within each session, each logical block is assigned a series of logical addresses. A device for reproducing data from a disk-shaped recording medium is:
This logical block number (LBN, Logical Bl
ACK Number) is used to access each sector.

[0005] The disc-shaped recording medium records data on each track in the program area, but needs to be formatted in a predetermined format. Generally, ISO
The 9660 file system (hereinafter referred to as ISO 9660) is used.

Here, ISO 9660 will be described. ISO 9660 is a file system originally created for a press-type disc-shaped recording medium such as a CD-ROM. The file structure of ISO 9660 is
As shown in FIG. 7, the root directory → the directory → the file, and the file is reached from the root, which is a so-called hierarchical directory structure, and the volume descriptor (VD, Volume D)
descriptor). The VD includes a main volume descriptor (PVD, Primary
Volume Descriptor, Secondary Volume Descriptor (SVD, Supplementary Vol)
volume Descriptor and Volume Partition Descriptor (VPD)
descriptor). Also, ISO 9660
Has a path table, which is a unique search table indicating all of the disk-shaped data, in addition to the directory structure described above.

The structure of an ISO 9660 session is:
As shown in FIG. 8, it is composed of a PVD, a path table, and a directory structure.

The PVD exists in the sector 16 which is the first track of a session regardless of whether the CD-ROM is a single session composed of one session or a multi-session composed of a plurality of sessions. ing. The PVD indicates a logical address of another data structure such as a path table and a directory. The path table is used, for example, when an OS (Operating System) of a computer searches for a file, and a desired directory can be found without reading all directories.
The CD-ROM can be read at high speed to a file by this path table. Further, the path table indicates locations of all directories including a root directory in the disk-shaped recording medium. The root directory includes a file structure and a substructure indicating a directory structure.

Data recording according to ISO 9660 is as follows.
The press process takes time and effort, but is characterized in that it does not burden the CPU of the computer when reproducing data.

In recent years, a CD-R (CD Recordable) as a data recordable medium and a CD-RW (CD Rewriteable) as a rewritable medium have been developed.
le) has appeared. The CD-R is a disc-shaped recording medium in which a recording layer is made of an organic photoreactive dye film, and information is recorded by irradiating the recording layer with a high-temperature laser beam. In the CD-R, new data can be additionally written after data is recorded, and the physical data track is divided into a plurality of sessions because it is a write-once (Write Once) that cannot be rewritten. Information is recorded by so-called multi-session additional recording. The CD-RW has a recording layer of, for example, Ag-In-Sb.
This is a disc-shaped recording medium made of a phase change material of -Te and recording information by irradiating a high-temperature laser beam to the recording layer. CD-RW specifically utilizes a phase change, which is a physical transfer between crystalline and non-crystalline.

The disk-shaped recording medium such as the CD-ROM described above continuously records data spirally from inside to outside of the disk. Such a recording method is called a sequential write method. The sequential write method includes DAO (Disk At Onc).
e), TAO (Track At Once) and packet write. DAO is a recording method in which data for one disk is recorded at a time, and data cannot be additionally recorded later. TAO is a recording method in which data is recorded in track units and data can be additionally recorded later. The packet write is a recording method in which data can be recorded in a unit smaller than the TAO track, and data can be additionally recorded later.

[0012] TAO can record only up to 99 tracks according to the definition of the Red Book described above, but packet writing is a recording method that has no limit on the number of packets and is easy to use. However, the file system of ISO 9660 is not suitable for the above-described packet write recording method for recording in packet units. So, OSTA
(Optical Storage Technology
y Association) is CD-R and CD-R.
As a standard related to RW playback and / or recording, UDF
(Universal Disk Format) A file system was formulated.

Here, the UDF will be described. UDF
Disc-type recording media conforming to the CD-R / RWO standard
As described in the official Guide Book (written by Orange Forum, published by Exceed Press Co., Ltd.), packet writing is used when writing data. There are two types of packets used for packet writing: fixed length and variable length. When data is written, for example, on a CD-R, four different types of information, one link block, four run-in blocks, one data, and two run-out blocks, for one packet Is continuously C
Recorded on DR. The difference between fixed-length and variable-length packets is that the data segment portion has a fixed size or a variable size.

In UDF, instead of directly managing directory and file management information as actual recording positions, file identifiers (FIDs, File Identities) are used.
fire Descriptor, virtual allocation table (VAT, VirtualAllocation)
Table), file entry ICB (File E)
ntry Information Control B
lock) or the like.

The VAT is a technology for treating a sequential write type disk-shaped recording medium virtually like a random read / write type disk-shaped recording medium. A virtual address corresponding to the address is managed as a correspondence table.

Accordingly, in the UDF file system,
It indirectly refers to directory and file location information. Although the position of the VAT can be freely arranged in the packet structure, the virtual allocation table ICB (VAT ICB) pointing to the VAT includes a linking area (Linking Area) from the last sector recorded on the disk-shaped recording medium. It has been decided that it will always be placed where you are back just minutes. The linking area is a joint area of seven blocks between adjacent packets.

In a UDF-compliant file system,
The latest VAT ICB is always described at a position which is returned by 7 blocks prepared as a linking area from the last address position of the disc. Therefore UD
In F, first, VAT ICB points to V
By reading the AT, the virtual address can be converted to a real address.

A CD-R or CD-RW on which data is recorded in the above-mentioned UDF file format is a CD-R or CD-RW.
An R or CD-RW drive can record and / or reproduce data, but a CD-ROM drive that supports the ISO 9660 file format cannot reproduce data.

Therefore, the CD-R or CD-RW drive performs a finalizing process for converting a file format from UDF to ISO 9660. In the finalizing process, an ISO 9660 conversion table is recorded in the first track of data recorded by UDF, and the CD-R
Alternatively, it is a process of recording lead-in information at a predetermined position on a CD-RW and recording lead-out information at the end of the data.

[0020]

In the case where new data is additionally recorded after the above-mentioned finalizing process, even in a rewritable disc-shaped recording medium, it is not possible to additionally record in the previous data area, and a new data is recorded. There is a problem that data must be recorded in the data area, and additional recording can be performed only in a multi-session.

In addition, in the multi-session additional recording, a large number of lead-in information and lead-out information are present on one disk-shaped recording medium, and there is a problem that the data recording area is limited.

Accordingly, 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 present invention is applied to the final session of the disc-shaped recording medium. It is another object of the present invention to provide a data recording method and apparatus for performing an unfinalizing process and additionally writing data from the position of the lead-out information deleted by the unfinalizing process.

[0023]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a data recording method according to the present invention records data in a data area of a rewritable disk-shaped recording medium by a sequential write method. A data recording method for recording lead-in information at a predetermined location on a recording medium and performing a finalizing process for recording lead-out information at the end of the data, wherein the disk-shaped recording is performed when data is additionally recorded in the data area. When the medium has been subjected to the finalizing process, an unfinalizing process of erasing the lead-in information and lead-out information of the last session of the disc-shaped recording medium is performed, and data is read from the position of the erased lead-out information. Append.

According to such a data recording method, when data is additionally recorded on a rewritable disk-shaped recording medium that has been subjected to finalization processing, unfinalizing processing is performed on the disk-shaped recording medium to obtain lead-in information and lead-out information. Is erased, and data is added from the position of the erased lead-out information.

In order to solve the above-mentioned problems, a data recording apparatus according to the present invention records data in a data area of a rewritable disk-shaped recording medium by a sequential write method, and writes the data in a predetermined area of the disk-shaped recording medium. A data recording apparatus having a finalizing function of recording lead-in information on a disc and recording the lead-out information at the end of the data, and erasing the lead-in information and the lead-out information of the last session of the disc-shaped recording medium. An unfinalizing processing unit, and a data appending unit that appends data from the position of the erased lead-out information, wherein when the data is additionally recorded in the data area, the disc-shaped recording medium is subjected to the finalizing process. The disk-shaped recording by the unfinalizing processing means. Clear the lead-in information and the lead-out information is recorded in the body, to append data to the data area by said additional data writing means.

Such a data recording apparatus includes unfinalizing processing means and data additional recording means, and when adding data to a rewritable disk-shaped recording medium which has been finalized, the above unfinalizing processing means uses The lead-out information and the lead-out information of the disc-shaped recording medium are erased, and the data is written from the position of the lead-out information by the data writing means.

[0027]

Embodiments of the present invention will be described below in detail with reference to the drawings.

The present invention relates to a digital still camera (DSC, Digital Still Camera) as shown in FIG.
Camera 1).

DSC1 is a UDF (Universal)
A device that records, reproduces, deletes, and additionally records photographed image data on a rewritable disc-shaped recording medium (hereinafter, referred to as a disc-shaped recording medium) based on a file system conforming to a Disk Format. Recording a file in which the image data is stored,
At the time of reproduction, erasure, and additional recording, VAT (virtual) recorded at the end of the last session of the disc-shaped recording medium is used.
All Allocation Table) is read out so that previously recorded data can be referred to.

UDF is a CD-R (Compact D)
isk Recordable), CD-RW (Com
compact disk rewritable) and CD-
MO (Compact Disk Magnet Opt)
It is a file system that can be used between various types of media, such as OSA (optical) and OSTA (optical storage).
Ge Technology Association)
Formulated by

UDF has a file entry ICB (File Entry Information) as a main data structure.
Application Control Block). In UDF, all files and directories have their own ICB.

The VAT is a so-called mapping 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, whereas in the UDF, it is referred to by a virtual address as described above. The virtual address does not change because the packet is recorded on the disk-shaped recording medium and is referred to by the VAT ICB even if the logical address of the file changes. In the UDF, it is determined that the VAT ICB is placed at the physical address recorded in the last session of the disc-shaped recording medium. VAT is divided and arranged on a plurality of extents, but VAT ICB
Contains the extent list of the VAT. Therefore, in the UDF, even if a file is changed in any way, it is not necessary to change the entire series of file pointers, and finally, only the VAT ICB can be changed to reach the changed file. An extent is a set of blocks written continuously on a disk-shaped recording medium such as a CD-ROM.

UDF is compatible with all operating systems (Operati
It is an object of the present invention to enable recording by an NG System (NG System) and to reproduce a recorded file on any OS without using a special read program.

The DSC 1 includes a photographing unit 10 and an image signal arithmetic processing unit (Image Signal Processor).
r) 11, a display unit 12, and an OP (Optical P)
(Ickup) unit 13, RF signal processing unit 14, 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 The optical disk drive includes a spindle motor 22, a spindle motor 22, a thread motor 23, and a control unit 24, and records, reproduces, deletes, and additionally records photographed image data on a disk-shaped recording medium 25.

The photographing section 10 supplies the photographed image data to the image signal arithmetic processing section 11. The imaging unit 10 includes a lens unit 30 that captures an image of a subject, a CCD 31, and an S / H
A circuit 32 and an A / D converter 33 are provided. CCD
Reference numeral 31 generates an image signal from the image of the subject supplied from the lens unit 30 and supplies the generated image signal to the S / H circuit 32. The S / H circuit 32 samples and holds the image signal, and supplies the image signal to the A / D converter 33. A
The / D 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 arithmetic processing unit 11 includes a photographing unit 10
, The display unit 12, the signal processing unit 17, and the control unit 24. The image signal calculation processing unit 11 includes the control unit 2
Under the control of the control unit 4, the digital image signal supplied from the photographing unit 10 is subjected to image processing such as color standard form conversion from RGB signals to color difference / luminance signals, white balance, 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 section 12 displays the digital image signal supplied from the image signal operation processing section 11. Display 1
2 is a liquid crystal display, for example. OP section 13
Is connected to the RF processing unit 14, the signal processing unit 17, the tracking driver 20, and the focus driver 21. The OP unit 13 includes an objective lens, a laser diode, a laser diode driver (LDdri),
It has a photodetect IC (PDIC), a half mirror, and the like, detects an optical signal, and supplies it to the RF processing unit 14. When data is recorded on the disk-shaped recording medium 25, the OP unit 13 uses the signal processing unit 17 to emit a laser flicker / drive signal required for pit formation, a write strategy signal indicating an optimum value of laser intensity and blinking, and the like. Supplied.
The OP unit 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 converts the beam signals detected from the OP unit 13, eight side signals composed of side and main signals into
Sampling and holding, arithmetic processing are performed, and a focus error (FE,
Focus Error), Tracking Error (T
E, Tracking Error), Mirror (MIR)
R, Mirror), ATIP (AbsoluteTi)
me In Pregroove) and a signal such as a read main signal. The RF processing unit 14 includes, among the generated signals, an FMDT (Frequency Modulati
on Data), FMCK (Frequency Mo)
The modulation clock, the FE, and the TE are supplied to the servo signal processing unit 15, and the optimum values (OPC, Optical Power) of the laser intensity detected by test writing are supplied.
A calibration signal and a laser blinking / driving signal are supplied to the signal processing unit 17, and the MIRR is supplied to the control unit 24.

The servo signal processing unit 15 includes an RF processing unit 14
And the analog filter processing unit 16, and is controlled by the control unit 24. Servo signal processing unit 15
Receives FMDT, FMCK, TE, and FE from the RF processing unit 14, generates signals for controlling various servos under the control of the control unit 24, and supplies the signals to the analog filter processing unit 16.

The analog filter processing section 16 is connected to the servo signal processing section 15, the spindle driver 18, the thread driver 19, the focus driver 21, and the tracking driver 20. The analog filter processing unit 16 generates an analog signal from various servo control signals supplied from the servo signal processing unit 15 and supplies the analog signal to the spindle driver 18, the thread driver 19, the 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, is supplied with OPC from the RF processing unit 14,
(Cross Interleaved Reed-So
lomon Code) decoding and encoding, write strategy, ADDr decoding, and the like. Further, when recording data on the disk-shaped recording medium 25, the signal processing unit 17 supplies the OP unit 13 with a blinking / driving signal of a laser, a signal indicating an optimum value of laser intensity, and the like.

The spindle driver 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 controls a thread operation of the thread motor 23 based on a signal supplied from the analog filter processing unit 16. The tracking driver 20 includes the analog filter processing unit 16 and the OP unit 1
3, and oscillates the OP unit 13 based on a signal supplied from the analog filter processing unit 16 to control the position of a beam spot irradiated on the disk-shaped recording medium 25. The focus driver 21 is connected to the analog filter processing unit 16 and the OP unit 13, and moves the OP unit 13 in a direction perpendicular to the disk-shaped recording medium 25 based on a signal supplied from the analog filter processing unit 16. This controls the focal position of the beam.

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 motor 23 is connected to the thread driver 19 and performs a thread operation of the OP unit 13 based on a signal supplied from the thread driver 19.

The control unit 24 includes a CPU, a program memory, and a DRAM (Dynamic Random Acc).
ESS Memory) and SRAM (Static R)
and an image access processing section 11 and a servo signal processing section 15.
And the signal processing unit 17. Programs for performing various processes are stored in the program memory. The DRAM has a work area for temporarily storing the VAT ICB and various data. The control unit 24 controls reading and writing of the VAT ICB.

The disk-shaped recording medium 25 stores, reproduces, and records data based on a file system conforming to UDF.
A rewritable recording medium that is erased and additionally recorded,
For example, a CD-RW.

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

In step ST1, the DSC 1 determines whether a recorded CD-RW is set as a recording medium. If a recorded CD-RW is set, the process proceeds to step ST3, where an unused CD-RW is used.
If -RW is set, the process proceeds to step ST2.

In step ST2, DSC1 sets C
Initialize (initialize) the D-RW into the UDF file format.

In step ST3, the DSC 1 photographs a subject.

In step ST4, the DSC 1 records the data shot in step ST3 on a CD-RW. At this time, the data is recorded in the UDF file system.

In step ST5, the DSC 1 determines whether to photograph another subject. When photographing another subject, the process returns to step ST3, and when not photographing another subject, the process proceeds to step ST6.

In step ST6, DSC1 sets C
It is determined whether the D-RW is to be finalized. When performing the finalizing process, step ST7
Proceed to.

In step ST7, DSC1 sets C
Finalize the D-RW.

Here, the finalizing process will be described. For example, a CD whose data is recorded in the UDF file format and has not been finalized
-RW is a general personal computer (PC, P
data cannot be played back on a personal computer. This is because the PC does not support UDF. Therefore, in order to reproduce the data recorded on the CD-RW by the PC, a CD-ROM file system such as ISO 9660 supported by the PC is used.
It is necessary to convert the RW file format. This conversion work is called finalization processing.

Here, the UDF write method will be described. Generally, a rewritable disc-shaped recording medium such as a CD-RW employs a random write method using fixed-length packets when data is recorded by UDF. As in the case of the write-once type disc-shaped recording medium, a sequential write method using variable-length packets is employed. In packet write, C
Since data is recorded in the user area of the D-RW, lead-in information and lead-out information are not recorded. But,
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-out 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 lead-out information generated by the finalizing process performed in step ST7 on the CD-RW. If the CD-RW is not subjected to the unfinalizing process, the process returns to step ST3 and returns to step ST3.
If the D-RW is to be unfinalized, the process proceeds to step ST10.

At step ST10, DSC1
Unfinalize the CD-RW. And
Thereafter, the process returns to step ST3.

Here, the unfinalizing process will be described. In the CD-RW, as shown in FIG. 3A, a first session delimiter (hereinafter, referred to as lead-in information) and an ISO9660 conversion table are recorded at the beginning of the data, and a first end of the data is recorded at the end of the data. A so-called finalization process is performed in which two session breaks (hereinafter referred to as lead-out information) are recorded. CD-
Whether or not the RW has been subjected to the above-described finalization processing is confirmed by the following SCSI command. DSC1
Is a CD-RW with RDI (Read Disk Info)
) command is issued, the DS (Disk Status) command that is the return value of the RDI command is Incomplete, and the LSS (Last Session St) in the return value of the RDI command is included.
When it is confirmed that (atus) is Complete, it is confirmed that the CD-RW has been finalized.

It is confirmed that the CD-RW has been finalized as described above, and as shown in FIG.
The lead-in information and the lead-out information are deleted. The erasure of the lead-in information and the lead-out information is performed by the following S
This is performed using a CSI command. DSC1 is UL to CD-RW
S (Unclose the Last Session)
n) Issue a "Blank" command for the mode.

After the lead-in information and the lead-out information are erased from the CD-RW as described above, the ISO 9600 conversion table is erased as shown in FIG.
The deletion of the ISO 9660 conversion table is performed by the following SCS
This is performed by an I command. The DSC 1 stores “Blank a Tr” of the “Blank” command in the ULS mode on the CD-RW.
ack ”. The command may be other than the SCSI command as long as the command can perform the above-described operation.

When the CD-RW adds new data to the previously recorded data in step ST7, as shown in FIG. 4, the lead-in information and the ISO 9660 conversion table are provided in front of the data area. Is recorded, and lead-out information is recorded behind the data area. Also, the lead-in information and the lead-out information
It is a pair and it is not possible to erase only one of them.

As described above, as shown in FIG. 5, the DSC 1 uses the lead-in information, the ISO 9660 conversion table, and the lead-out information after the second session, which are required for the conventional additional recording of data, as data areas. Can be. For example, 1st session and 2nd
2n by making a session into one session
A total of 13.324 MB of the second lead-in information of 9.216 MB and the second lead-out information of 4.108 MB required for generating the d session can be used as the data area. It should be noted that there are n (n> 1) sessions, and the total T of the lead-in information and the lead-out information when the number of sessions is one is as follows. T = 13.324 x (n-1) MB This total T can be spent in the data area.

The DSC 1 configured as described above, when additionally recording data on the rewritable disc-shaped recording medium 25 that has been finalized, performs unfinalization processing on lead-in information, lead-out information, and I / O information.
Since the SO 9660 conversion table is erased and the data is additionally recorded, the area of the management information after the second session, which is conventionally required, can be used as the data area.

[0065]

As described in detail above, the data recording method according to the present invention records data by a sequential write method, and additionally records data on a finalized rewritable disc-shaped recording medium. At this time, since an unfinalizing process is performed and data is additionally recorded, an area of management information which has been conventionally required can be used as a data area.

Further, since the data recording apparatus according to the present invention includes the unfinalizing processing means and the data additional recording means, a rewritable disc-shaped recording medium on which data is recorded by the sequential write method and which has been subjected to the finalizing processing. When data is additionally recorded on the medium, the unfinalizing process is performed on the disc-shaped recording medium by the unfinalizing processing means, and the data is additionally recorded by the data recording means. Can be used for

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a digital still camera to which the present invention has been applied.

FIG. 2 is a flowchart illustrating an example of a recording operation of a digital still camera to which the present invention has been applied.

FIG. 3 is a diagram showing a block structure of a disc-shaped recording medium by an unfinalizing process of a digital still camera to which the present invention has been applied.

FIG. 4 is a diagram showing a block structure of a disk-shaped recording medium when data is additionally recorded by unfinalizing processing, data additional recording, and finalizing processing of a digital still camera to which the present invention is applied.

FIG. 5 is a diagram showing an unused area that can be secured when data is additionally recorded by a digital still camera to which the present invention is applied.

FIG. 6 is a diagram showing a data block structure on a disk-shaped recording medium.

FIG. 7 is a diagram showing a basic file structure of ISO 9660.

FIG. 8 is a diagram showing the structure of an ISO 9660 session.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Digital still camera, 10 imaging part, 11 image signal calculation processing part, 12 display part, 13 OP part, 14
RF signal processor, 15 servo signal processor, 16 analog filter processor, 17 signal processor, 18 spindle driver, 19 thread driver, 20 tracking driver, 21 focus driver, 22
Spindle motor, 23 thread motor, 24 control unit, 25 disk-shaped recording medium

Claims (6)

[Claims] 1. A method for recording data in a data area of a rewritable disk-shaped recording medium by a sequential write method, recording lead-in information at a predetermined location on the disk-shaped recording medium, and providing lead-out information at the end of the data. A data recording method for performing a finalizing process for recording the last session of the disc-shaped recording medium when the disc-shaped recording medium has been subjected to the finalizing process when data is additionally recorded in the data area. A data recording method, comprising: performing an unfinalizing process of erasing lead-in information and lead-out information, and adding data from the position of the erased lead-out information. 2. When data is additionally written in the data area,
If the disc-shaped recording medium has been subjected to the finalizing process, select whether to add to the last session of the disc-shaped recording medium or create a new session at the end of the last session and add to the new session. 2. The data recording method according to claim 1, wherein: 3. A UDF (Universal Disk Format) is provided in a data area of the disk-shaped recording medium.
, Data is recorded by a sequential write method, lead-in information is recorded at a predetermined location on the disc-shaped recording medium according to the file format of the ISO 9660 file system, and an ISO is recorded at the beginning of the data.
A data recording method for recording a 9660 conversion table and performing a finalizing process for recording lead-out information at the end of the data, wherein when the data is additionally recorded in the data area, the disc-shaped recording medium is used in the ISO 9660 file system. If finalized according to the file format, lead-in information, lead-out information and ISO
2. The data recording method according to claim 1, wherein an unfinalizing process for erasing the 9660 conversion table is performed, and data is additionally recorded from the position of the erased lead-out information by a sequential write method of UDF. 4. A method for recording data in a data area of a rewritable disk-shaped recording medium by a sequential write method, recording lead-in information at a predetermined location on the disk-shaped recording medium, and providing lead-out information at the end of the data. A finalizing processing means for erasing lead-in information and lead-out information of the last session of the disc-shaped recording medium; and a data recording device from the position of the erased lead-out information. When data is additionally written in the data area, when the disc-shaped recording medium has been subjected to the finalizing process, the data is recorded on the disc-shaped recording medium by the unfinalizing processing unit. Lead-in and lead-out information A data recording apparatus for erasing and additionally writing data in the data area by the data writing means. 5. When data is additionally written in the data area,
If the disc-shaped recording medium has been subjected to the finalizing process, select whether to add to the last session of the disc-shaped recording medium or create a new session at the end of the last session and add to the new session. 5. The data recording apparatus according to claim 4, further comprising an additional writing selection unit. 6. A UDF (Universal Disk Format) is provided in a data area of the disk-shaped recording medium.
, Data is recorded by a sequential write method, lead-in information is recorded at a predetermined location on the disc-shaped recording medium according to the file format of the ISO 9660 file system, and an ISO is recorded at the beginning of the data.
What is claimed is: 1. A data recording apparatus having a finalizing processing function of recording a 9660 conversion table and recording lead-out information at the end of the data, wherein the data is read-in from a disc-shaped recording medium that has been finalized according to the file format of the ISO 9660 file system. Information, readout information and I
An unfinalizing processing unit for erasing the SO 9660 conversion table; and a data appending unit for appending data by a sequential write method of the UDF from the position of the erased lead-out information. When the disc-shaped recording medium has been subjected to the finalizing process, the lead-in information, the lead-out information and the ISO 9660 conversion table recorded on the disc-shaped recording medium are erased by the unfinalizing processing means, and the data is deleted. 5. A data recording apparatus according to claim 4, wherein data is additionally recorded in said data area by an additional recording means.