JP2002117548A - Information recording medium and recording and reproducing method of information recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a RAM/ROM mixed disk having an exclusively reproducing region and a rewritable region considering standards such as UDF and ISO9660 and data writing systems such as a track at once system and a packet writing system. SOLUTION: An information recording medium is provided with a phase change type recording layer on a substrate, wherein a part in the crystal state is made to be in an unrecorded state and erased state and a part in the amorphous state is made to be in a recorded state, and has the exclusively reproducing region and the rewritable region in an information recording region. Information is continuously recorded (track at once) in the exclusively reproducing region and information is separately recorded (packet writing) in the rewritable region and a transition region (gap) is provided between the exclusively reproducing region and the rewritable region.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a CD-RW (CD-RW) having, for example, a read-only area and a rewritable area.
le) It relates to an information recording medium suitable for use as a disc and a recording / reproducing method thereof.

[0002]

2. Description of the Related Art In recent years, optical disks have become widespread as recording media suitable for distributing, copying and storing large amounts of data.
Among such optical discs, CD-format read-only discs (CD-ROM), write-once discs (CD-R), and rewritable discs (CD-RW) include:
It is the most popular optical disk family. The characteristics of these CD-ROMs, CD-Rs, and CD-RWs are in the attributes of the data, and are used properly according to the attributes of the data.

[0003] First, a CD-ROM is suitable for transferring data of the same contents to a substrate by transferring concave pits to a substrate, copying in large quantities, and distributing. On the other hand, CD-Rs and CD-RWs can record arbitrarily additional or rewritable data, and are suitable for personal-level data storage and the like. Among them, the CD-RW is expected as an inexpensive and large-capacity backup storage medium replacing the floppy (registered trademark) disk and the MO disk.

[0004] In particular, a read-only area (R
A rewritable disc having an OM area is preferable in that it enables both distribution of data such as application programs and recording of user data. Therefore, using the CD-RW, the R
OM area, while freely rewritable area (RA
(M area) is desired to be realized as a ROM / RAM mixed disk.

[0005]

SUMMARY OF THE INVENTION CD-RO
The logical formats of optical disks (information recording media) such as M, CD-RW, DVD-RAM, etc.
Format with a volume structure conforming to 9660 (this is called ISO 9660 format) and UD
F (Universal Disk Format, IEEE
13346) (UDF format).

Here, the ISO9660 format is
A standard format for the logical format of a CD-ROM set by the International Standards Organization, and is originally a read-only CD-ROM.
(Yellow Book) defines the procedures for file management information. UDF, on the other hand, is an OSTA (Optical Storage Technology Association)
It was determined by

On the other hand, CD-ROM, CD-RW, DVD
-As a method of writing data to an optical disk (information recording medium) such as a RAM, the main methods are Track At Once and Packet Write.
ite). Here, Track At Once
At Once), data is written using a track as one unit of data as one recording unit. On the other hand, the packet write divides data into packets of a fixed length (for example, 64 kilobytes) and writes the packets as one recording unit.

As described above, the CD-RW, DVD-RAM
When data is recorded on an optical disk such as an optical disc, the appropriate standards and data writing methods differ depending on the data. As described above, both the distribution of application programs and other data and the recording of user data are possible. ROM
When realizing a ROM / RAM mixed disk having an area and a RAM area, it is necessary to consider these.

In particular, some application programs have large capacities, and it is desired to secure at least a large area in which user data can be written, so that data can be recorded while saving the capacity as much as possible.
The present invention has been made in view of such a problem.
Considering standards such as DF and ISO9660 and data writing methods such as track-at-once and packet writing,
RAM / ROM having read-only area and rewritable area
An object of the present invention is to provide an information recording medium and a method of recording and reproducing information on the information recording medium, which are capable of realizing a mixed disk.

It is another object of the present invention to realize a RAM / ROM mixed disk having a read-only area and a rewritable area while recording data while saving the capacity as much as possible. Furthermore, UDF structure data and I
It is another object of the present invention to realize a RAM / ROM mixed disk having a read-only area and a rewritable area while ensuring access to any data having the SO9660 structure.

[0011]

According to the first aspect of the present invention, there is provided an information recording medium in which a portion in a crystalline state is set to an unrecorded / erased state and a portion in an amorphous state is set to a recorded state on a substrate. An information recording medium comprising a phase-change recording layer and having a read-only area and a rewritable area in an information recording area,
A read-only area is configured by continuously recording information,
A rewritable area is configured by discretely recording information,
A transition area is provided between the read-only area and the rewritable area.

[0012] Discrete recording means that data can be recorded at random positions on a recording medium such as a hard disk or a floppy disk. At this time, information is usually divided into fixed-length data so that random access is easy to perform, and even if an overrun occurs during writing, blocks without data are placed before and after each data so that adjacent data is not broken. It is added and recorded.

On the other hand, continuous recording means recording information in one stroke, such as a tape medium.
The transition area is provided to prevent data in the read-only area and data in the rewritable area from being overwritten, and is usually an area in which nothing is recorded or only subcode data is recorded. . This transition area is preferably at least 100 blocks or more.

In particular, as information to be written in the read-only area, for example, an application program or the like can be considered. Generally, the capacity of such program data is as follows.
In most cases, it is 4 megabytes or more (predetermined capacity or more)
When writing data having a capacity of 1.4 megabytes or more (predetermined capacity or more), a track-at-once (Track At Once) method for continuously recording data from the viewpoint of storage capacity.
On the other hand, since the rewritable area needs to rewrite data, it is preferable to use packet write for discretely recording data. Therefore, two different writing methods coexist so that data can be written while saving the capacity as much as possible.

Preferably, the read-only area is an ISO 96
60, and the rewritable area is configured as a UDF structure (claim 2). In addition, management information and data of the ISO9660 structure are recorded in the read-only area, and a specific element of the management information of the UDF structure is recorded, and a non-specific element of the management information of the UDF structure is recorded in the rewritable area. It is preferable to record the data of the element and the UDF structure (claim 3).

In particular, it is preferable that the specific element is configured to include a beginning extended area descriptor, an NSR descriptor, and a terminating extended area descriptor (claim 4). Preferably, the specific element includes a first anchor volume descriptor (claim 5).

Further, management information of the ISO9660 structure is
The Beginning Extended Area Descriptor includes the Volume Descriptor Set Terminator, including the Volume Descriptor Set Terminator.
It is preferable that the terminator is configured to be recorded at a logical block address next to the logical block address to be recorded (claim 6).

Further, information is recorded in a read-only area by recording information by a pre-pit row, and in a rewritable area, an amorphous mark is formed by irradiating recording light to a phase-change type recording layer. Preferred (claim 7). Furthermore, PM
A, the information recording area includes a lead-in area, a program area, and a lead-out area, and the program area includes a read-only area and a rewritable area. , A lead-in area, a lead-out area, information is recorded by a pre-pit row, and a rewritable area is recorded by irradiating a recording light to a phase change type recording layer to form an amorphous mark. It is preferable to configure (claim 8).

Further, both the read-only area and the rewritable area record information by irradiating the phase-change recording layer with recording light to form an amorphous mark, and the read-only area is prohibited from being rewritten. (Claim 9).
The information recording medium of the present invention according to claim 10 is provided on a substrate,
An information recording medium comprising a phase-change recording layer in which a part in a crystalline state is in an unrecorded state / erased state and a part in an amorphous state is in a recorded state, the information recording medium comprising a management area and a user area. The area is the lead-in area, the first track,
The session is configured as one session including a second track and a lead-out area.
And the second track is constituted by a UDF structure.

According to an eleventh aspect of the present invention, there is provided the information recording medium according to the present invention, wherein a phase-change recording layer in which a portion in a crystalline state is an unrecorded state / erased state and a portion in an amorphous state is a recorded state is provided. An information recording medium having a read-only area and a rewritable area in an information recording area, wherein a primary volume descriptor, a supplementary volume descriptor as management information of an ISO9660 structure, A volume descriptor set terminator and data of the ISO9660 structure are recorded, and a beginning extended area descriptor, an NSR descriptor, a terminating extended area descriptor, and a specific element of the management information of the UDF structure. First Anchor Volume Descriptor is recorded, in the rewritable area, the data elements and UDF structure other than the specific elements of the management information of the UDF structure is characterized in that it is recorded.

[0021] Preferably, in the reproduction-only area, the first anchor and the first element are specified as specific elements of the management information of the UDF structure.
The volume descriptor is also recorded (claim 12). 14. The recording / reproducing method for an information recording medium according to claim 13, further comprising a management area and a user area, wherein the user area includes a lead-in area, management information of an ISO9660 structure, data of an ISO9660 structure, and management information of a UDF structure. A first track in which specific elements of the UDF structure are stored, a second track in which elements other than the specific elements in the management information of the UDF structure and data of the UDF structure are stored,
A recording and reproducing method for an information recording medium configured as one session including a lead-out area, comprising:
The data of the 9660 structure includes the ISO96 of the first track.
While accessing based on the management information of 60 structures, UD
The F structure data is accessed based on a specific element of the management information of the UDF structure of the first track and an element other than the specific element of the management information of the UDF structure of the second track. .

Preferably, when reading the data recorded in the user area, the data of the ISO9660 structure is read after the data of the UDF structure is read (claim 14).

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an information recording medium and a method for recording and reproducing the information recording medium according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing an example of an arrangement of a management area (non-data area) and a data area of a CD-RW (optical disc) as an information recording medium to which the present invention is applied.

As shown in FIG. 1, a CD-RW (also simply referred to as a disc) 100 is a recording medium that can be optically reproduced or recorded, and has a management area 101 and a user area 102. . Among them, the management area 101 is
An area that can be reproduced by a drive device (not shown) and cannot be accessed by the user.
(Power Calibration Area) and PMA (Program Memory)
Area). Here, the PCA is an area in which information for adjusting the intensity of the laser when writing data is recorded. The PMA is a temporary file management information recording area unique to a CD-R or CD-RW, and temporarily records, for example, a recording start address at the time of additional recording.

The user area 102 is an area that can be read by the drive device and can be accessed by the user as desired. The user area 102 includes a lead-in area 103 for storing a lead-in and a data area (program area) 1 for recording user data.
07 and a lead-out area 106 for storing the lead-out. Here, the lead-in area 103
Is the TOC originally used in CD-ROM format
This is an area for writing file management information and disk management information called (Table of Contents). Data area 1
Reference numeral 07 denotes a read-only read-only area (ROM area) 10 in which a drive device (not shown) can only read data.
4 and a rewritable area (RAM area, RW area) in which a drive device (not shown) can record, erase and reproduce data.
105. The lead-out area 106
This is an area for indicating the end of the EFM data.

The elements constituting the management area 101 and the user area 102 include the PCA, PMA, lead-in area 103, ROM area 1
04, the RAM area 105, and the lead-out area 106. In the ROM area 104, E
FM-modulated information is recorded by a pre-pit string.
The information to be recorded in the ROM area 104 may be, for example, application software or driver software, but the type is not particularly limited.

For example, special CD-RW medium information, authentication information, and the like may be used. The CD-RW has a problem that the protection of such a copyrighted work is not thorough because the user can easily copy the data of the copyrighted work such as music, a movie or a computer program. As a method for protecting such copyrighted data, a usage fee is added to a CD-RW in advance, authentication information and the like are recorded in a ROM area 104, and such a CD-RW is authenticated as an authenticated CD-RW.
A method of permitting copying of copyrighted data only for the RW is conceivable.

On the other hand, the RAM area 105 has a phase change type recording layer, and the crystal state portion of the phase change type recording layer is set to an unrecorded / erased state, and the amorphous portion is set to a recorded state. It is. The RAM area 105 is provided with a guide groove (wobble groove) having wobbles, and while guiding along the wobble groove, irradiates the phase-change recording layer with recording light to form an amorphous mark (recording). By forming a mark, information that is EFM-modulated is recorded.

Although the ROM area 104 is located at the innermost periphery of the data area 107 in FIG. 1, it is not always necessary to set it at the innermost periphery. However, in consideration of accessibility and simplicity of manufacture, it is preferable to set the data area to the innermost circumference or the outermost circumference. In addition, C in only the RAM area 105
If importance is placed on compatibility with the D-RW, it is preferable that the innermost periphery of the data area 107 be the RAM area 105.

The CD-RW according to the present embodiment
In 100, not only the RAM area 105 but also the ROM area 1
04 also has a phase change type recording layer. Specifically, as shown in FIG. 2, at least the phase change recording layer 52 is provided on the substrate 50 over the entire management area 101 and the user area 102. Preferably, the layer structure of the CD-RW 100 is such that a substrate (polycarbonate substrate) 50 having a guide groove and / or a concave portion serving as a prepit formed on the surface thereof is formed on the substrate 50 by covering the substrate 50. A phase-change recording layer 52 capable of forming an amorphous mark that can obtain a reproduction signal substantially the same as that described above, and the amount of laser light absorption in the phase-change recording layer (recording layer) 52 is controlled, and the reflectivity is controlled by the multiple interference effect. , The heat dissipation from the recording layer 52 is controlled, and the protective layer 51, which suppresses the thermal deformation of the recording layer and the substrate,
53 and a reflective layer 54 made of a reflective film provided on the side opposite to the recording / reproducing light incident side of the recording layer 52 in order to reflect laser light and promote heat radiation from the recording layer, In addition, the top layer prevents direct contact with air,
In order to prevent damage due to contact with foreign matter, a protective coating layer 55 such as an ultraviolet curable resin layer or a thermosetting resin layer is provided with a thickness of about 1 μm to about several hundred μm.

As described above, in the present embodiment, the ROM region 104 is provided with the same layer as the RAM region 105. As shown in FIG. 2, a plurality of pits (pre-pits) 6 are provided in the ROM area 104 of the substrate 50.
A pit row (pre-pit row) composed of 0s is formed, and a guide groove 61 is formed in the RAM area 105.

As described above, the R composed of the pre-pit
A CD-RW (hybrid CD-RW; as a ROM / RAM mixed disk) having an OM area 104 and having a RAM area 105 as a freely rewritable area.
An optical disk is preferable in that it enables both the distribution of data such as application programs and the recording of user data.
It is necessary to consider standards such as F and ISO9660 and data writing methods such as track-at-once and packet write, and it is also necessary to be able to record data while saving as much capacity as possible.

Here, as the logical format, a format having a volume structure conforming to ISO9660 (this is referred to as ISO9660 format) and a format having a volume structure conforming to UDF (Universal Disk Format, IEEE13346) are mainly used. (UDF format). Of these, the ISO9660 format defines a procedure for file management information of a read-only CD-ROM (Yellow Book), and is a format suitable mainly for writing read-only data in one stroke. The UDF format, on the other hand, is based on the U.S. industry association OSTA (Optical Storage Technology Association).
This format is determined according to n) and is suitable for writing data that needs to be rewritten (rewritable data).

The data writing method mainly includes a track-at-once (Track At Once) and a packet write (Packet Write). Among them, the track-at-once (Track At Once) is to write data in a track as one unit of data as one recording unit, and to continuously record data (information). On the other hand, the packet write divides data into packets of a fixed length (for example, 64 kilobytes, 32 blocks) and writes the packets as one recording unit, and discretely records data (information). Is what you do.

Therefore, data such as an application program is recorded in the ROM area 104 composed of the pre-pit row 60 while saving data as much as possible while saving the data as a freely rewritable area.
By recording user data in the M area 105,
In order to realize a CD-RW (hybrid CD-RW; optical disk) as an OM / RAM mixed disk, it is necessary to consider the following points.

For example, if the writing method of data in both the ROM area 104 and the RAM area 105 is set to Track at Once, when user data recorded in the RAM area 105 is rewritten, one data is written. It is not desirable because rewriting is performed using a track as a unit of data as one recording unit. In particular, when it is necessary to frequently rewrite the RAM area 105, the processing becomes complicated, which is not preferable.

As described above, the track at once (Trac
Recording at (k at Once) is suitable, for example, when writing a large amount of data to a CD-ROM, and writing data to be written together using application software for writing and then recording at once. ROM
It is not suitable for a CD-RW used for reading application software from the area 104 and writing user data to the RAM area 105.

For example, it is conceivable to use a multi-session format to set two sessions, the first session (session 1) as the ROM area 104, and the second session (session 2) as the RAM area 105. In this case, since the lead-in and lead-out are recorded for each session, the capacity is reduced by the recording of the lead-in and lead-out. For example, if one session including a lead-in, a track, and a lead-out is recorded, the capacity is reduced by about 15 megabytes for each session.

Further, in the multi-session format, usually, the data of the session on the rear side is read first, and the location information of the previous session recorded therein is read (ie, the management information of the previous session is added to the management information of the previous session). Access based on the previous session). Therefore, a multi-session format is used, and two sessions are used, and the first session (session 1) is stored in the ROM.
When the area 104 is used and the second session (session 2) is used as the RAM area 105, different standards (ISO9660, UDF) are used for session 1 and session 2.
When the data is recorded according to the above, only the data of the session 2 can be read even if a driver for ISO9660 having a function of reading data according to ISO9660 and a driver for UDF having a function of reading data according to UDF are provided.

For example, when the session 2 is recorded in accordance with ISO9660, the data of the session 2 is read by the driver for ISO9660.
Cannot be read in the session 1 recorded according to the above. On the other hand, if the session 1 is recorded according to the UDF, the session 2
Is read, but the data of session 1 recorded according to ISO9660 cannot be read.

For this reason, in the present embodiment, as shown in FIG. 3, in consideration of the above, the lead-in area 103 and the program area 10 of one CD-RW disc 100 are taken into consideration.
7, a user area 102 including a ROM area 104, a RAM area 105, and a lead-out area 106 is stored in a single session (single session, single session) including lead-in, two tracks (one recording unit of data), and lead-out. Format).

That is, data (data such as application programs and format data) to be recorded in the program area 107 composed of the ROM area 104 and the RAM area 105 at the time of formatting in the manufacturing stage at the factory is written on the track 1 (first track) and the track 1 (first track). Track 2
(2nd track)
Is recorded in the ROM area 104 by track-at-once (Track At Once) which can continuously record data (information), a gap 1 is provided as a transition area, and the track 2 is discretely stored in the RAM area 105. The data is recorded by a packet write (Packet Write) which can be recorded.

Note that discrete recording means that data can be recorded at random positions on a recording medium such as a hard disk or a floppy disk. At this time, information is usually divided into fixed-length data so that random access is easy to perform, and even if an overrun occurs during writing, blocks without data are placed before and after each data so that adjacent data is not broken. It is added and recorded.

On the other hand, continuous recording means recording information in one stroke, such as a tape medium.
The transition area is provided to prevent data in the read-only area and data in the rewritable area from being overwritten, and is usually an area in which nothing is recorded or only subcode data is recorded. . This transition area is preferably at least 100 blocks or more.

Although the first track is constituted by one track 1 and the second track is constituted by one track 2 in this case, the present invention is not limited to this. Each of the track and the second track may be composed of a plurality of tracks. When the first track and the second track are composed of a plurality of tracks as described above, the tracks included in the first track are track-at-once (Track At Once) capable of continuously recording data (information) in the ROM area 104. Recorded in
A gap 1 may be provided as a transition area, and tracks included in the second track may be recorded in the RAM area 105 by packet write that can discretely record information (data).

As described above, the R of the CD-RW disc 100
Only track 1 is recorded as the OM area 104, and RA
Since only track 2 is recorded as the M area 105,
The sizes of the ROM area 104 and the RAM area 105 change according to the capacity of the track 1 and the track 2. That is, the ROM area 104 where the track 1 is recorded
In the RAM area 1 where the track 2 is recorded
05 can be set arbitrarily.

As described above, the reason why the track is divided into two tracks and one of the tracks is recorded by track-at-once (TrackAt Once) is advantageous in terms of storage capacity. The reason will be described below. In the present embodiment, since the purpose is to enable both recording of data such as application programs and recording of user data,
At least the area for recording user data needs to be a rewritable area (RAM area), and this area is preferably recorded by packet write.

For this reason, it is conceivable to record all data in one track by packet write. However, when recording by packet write, 64 kilobytes (32 blocks) of data is recorded. However, link blocks, run-in blocks, and run-out blocks are also recorded, and these link blocks, run-in blocks, and run-out blocks are used for 14 kilobytes (seven blocks), reducing the capacity available for data to be recorded. Will be lost.

On the other hand, it is preferable that the data of the application program and the like be in a read-only area (ROM area) so as not to be erased.
rite). Therefore, data such as application programs are track-at-once (Trac
k At Once). However, in this case, in order to mix different writing methods of the packet write (Packet Write) and the track at once (Track At Once), it is necessary to divide the data into two tracks. Since a gap (Gap) is provided between the track and the track, the capacity is reduced by the gap (Gap).

Therefore, in order to save as much capacity as possible so as not to reduce the capacity that can be used for data to be recorded, it is better to record by packet write in relation to the capacity of data to be recorded. It is important to consider whether this is advantageous or whether it is more advantageous to perform recording at Track At Once. For example, data for X blocks is tracked at once (Track At Onc).
In the case of writing in e), the total number of blocks is determined by adding a gap between tracks (Ga
p) (the gap between tracks (Ga
(p) is 2 seconds, which is 150 blocks because it corresponds to 150 blocks (= 75 blocks × 2))
And the number of blocks of the run-out block (2 blocks) is obtained (X blocks + 150 blocks + 2 blocks; X + 152 blocks).

On the other hand, when writing X blocks of data by packet write, the total number of blocks is 39/32 times the number of X blocks, which is the number of data blocks.
Is subtracted from the number of blocks of one run-in block and one link block (run-in block + link block = 5 blocks) from the number of blocks multiplied by ([39/32) X-5 blocks]. .

Here, the reason why the X block is multiplied by the 39/32 block is that one run-in block, one link block and one run-out block correspond to one data block.
This is because the data is written one by one and a total of seven blocks are additionally written for one block of data. Also, 1
The reason why the number of blocks (5 blocks) of one run-in block and one link block is subtracted is that the run-in block and the link block are not written at the beginning of the head block.

Therefore, data for X blocks is written at track-at-once (Track At Once), and data for X blocks is written in a packet write (Packet W
The number of blocks is equal to the case of writing with rite) when the following equation holds. X + 152 = (39/32) X-5 When this is solved, X = 717.7...

For this reason, since 718 blocks, that is, one block is 2048 bytes, 2
048 bytes are multiplied, and 170464 bytes [71
When writing data of 8 × 2048 = 147064 bytes (1.4 megabytes)], a packet write (Packet) can be performed even with Track At Once.
Write), it can be seen that the number of data blocks that can be actually written is the same.

Therefore, data (file) of 1.4 megabytes or more (predetermined capacity or more; 718 blocks or more)
When writing Track At Once (Track At Once)
Once), the medium can be used more effectively in terms of capacity. For this reason, in the present embodiment, the ROM area 1
Track 1 to be recorded in 04 is data of an application program or the like, and is generally considered to be often data having a capacity of 1.4 megabytes or more. Therefore, recording is performed by Track At Once as described above. In order to save as much space as possible.

Further, as described above, a configuration in which one track includes two tracks is defined as a multi-session (that is, a session 1 including a lead-in, a track 1, and a lead-out; If recording is performed as session 2 consisting of lead-in, track 2, and lead-out), the lead-in and lead-out are recorded each time one session is recorded, so that a substantial capacity for recording data is required. (For example, one for each session).
It will be reduced by about 5 megabytes).

Further, as described above, if one session is provided with two tracks, even if the UDF structure and the ISO9660 structure are mixed, for example,
Both data of UDF structure data and data of ISO9660 structure can be reliably accessed,
There is an advantage that an information recording medium having a read-only area and a rewritable area can be realized.

By the way, as described above, in order to record the track 1 by the track-at-once (Track At Once), the volume structure (ISO
9660 structure), while track 2
To record the packet by Packet Write,
DF (Universal Disk Format, IEEE
E13346) is suitable for the volume structure (UDF structure).

However, one CD-RW disc 100
In order to make the ISO9660 structure and the UDF structure coexist above, there is a problem whether the management information of the UDF structure is in the ROM area 104 or the RAM area 105. For example,
A file description part that needs to be written each time a file is rewritten in the UDF structure (for example, Space Bitmap Descr
iptor or Root Directory) in the RAM area 105,
Although it is conceivable to write the data content of the file in the ROM area 104 or the RAM area 105, a file description part (for example, Space Bitmap) corresponding to another file is considered.
When writing a Descriptor or Root Directory, a file description section (for example, Space Bitmap Descriptor or Root Directory) corresponding to the file written in the ROM area 104
May be accidentally erased, and if it is erased, the file in the ROM area 104 cannot be reproduced.

When data (information) is recorded on the CD-RW disc 100, a group of the data (information) is called file data (File Data), and recording is performed in file data units. A unique file name is added to each file data to distinguish it from other file data. Grouping a plurality of file data having a common information content facilitates file management and file search. The group for each of the plurality of file data is called a directory (Directory) or a folder (Folder). A unique directory name (folder name) is added to each directory (folder). Furthermore, the plurality of directories (folders) can be collected and grouped in a higher-level directory (higher-level folder) as a group in a higher hierarchy. Here, the file data and the directory (folder) may be collectively called a file.

In the UDF standard, for example, Space Bitmap
File description part such as Descriptor and Root Directory is 1
Since it must be provided in one place, the file description part of one file (for example, Space Bitmap Descriptor or Root Directory)
rectory) and data contents are written in the ROM area 104 as read-only data (ROM data), and then the file description portion and data contents of other files cannot be written in the RAM area 105 as rewritable data (RAM data).

Further, a file description part of one file (for example, Space Bitmap Descriptor or Root Directory)
May be written as ROM data, and then the file description part of another file may be written as RAM data so as to be linked to the ROM data. However, at the time of rewriting the data, a predetermined unit (for example, every 64 kilobytes) is used. Since rewriting is performed, a file description portion of one file written as ROM data (for example, Space Bitmap Descr
(iptor and Root Directory) will be overwritten and the data will be destroyed.

For this reason, in the present embodiment, in consideration of these points, basically, as shown in FIG.
Track 1 of 04 has an ISO9660 structure, and track 2 of the RAM area 105 has a UDF structure. A specific element of the management information of the UDF structure is included in the track 1 of the ROM area 104. In particular,
A specific element of the management information of the UDF structure, that is, a beginning extended area descriptor (Beg
inning Extended Area Descriptor, NSR Descriptor (NSR Descriptor), Terminating Extended Area Descriptor (Terminating Ext)
ended Area Descriptor) and a first anchor volume descriptor (Anchor Volume Descriptor), as a track 1, a ROM area 10 as a read-only area.
4 is written. The details of the arrangement example of the ISO9660 structure and the UDF structure will be described later.

In particular, in the present embodiment, the first element of the management information of the UDF structure also includes the first anchor volume descriptor (Anchor Volume Descriptor). Driver). That is,
When the driver recognizes the data in the UDF format, the first anchor volume descriptor (Anc
hor Volume Descriptor), so that it can be used reliably regardless of whether it is required or not.

When the driver recognizes the data in the UDF format, the first anchor volume
When it is assumed that a descriptor (Anchor Volume Descriptor) is not required, the first anchor volume descriptor (Anchor Volume Descriptor) may not be provided. In this case, the specific element of the management information of the UDF structure is configured not to include the first anchor volume descriptor (Anchor Volume Descriptor).

By the way, in this embodiment, as shown in FIG. 4A, the track 1 has read-only data (ROM) in the ROM area 104 by pits (pre-pit strings) 60.
Track 2 is recorded in the RAM area 105
By forming an amorphous mark (recording mark) on the phase-change recording layer 52, rewritable data (RAM data,
RW data).

Here, in FIG. 4A, in the management area 101 and the user area 102 of the CD-RW disc 100, the portion recorded by the pits (pre-pit rows) 60 has a dark pattern, and the phase change type recording is performed. The portion recorded by forming an amorphous mark in the layer 52 is shown as a thin pattern. As shown in FIG. 4A, track 1 is recorded by pits (pre-pit train) 60,
PMA, lead-in, gap 1, track 2, and lead-out may be recorded by forming an amorphous mark on the phase-change recording layer 52.

Specifically, first, data of track 1 is recorded by pits (pre-pit trains) 60 (this becomes the ROM area 104), and then the data is recorded by a CD-RW drive.
Dummy data is recorded by track-at-once (Track At Once, TAO) on the phase change recording layer 52 on the track 1 recorded with the unevenness of the pits 60 in the ROM area 104, and a closed track is closed to close the track 1. Do. That is, the phase change recording layer 52 is superposed on the unevenness of the pits 60 recorded in the ROM area 104.
Record dummy data.

When the track 1 is closed by the CD-RW drive, a gap 1 as a transition area (buffer area, buffer area) is provided between the track 1 and the track 2. This gap 1 is about 2 seconds (1 second corresponds to 75 blocks). The reason why the gap 1 is provided between the tracks and the tracks are divided is that the data writing method is changed between the tracks 1 and 2.

Next, the CD-RW drive records the start position, length, track mode, etc. of track 1 in the PMA. Next, using a CD-RW drive, the data of track 2 is written to the packet 1 (Pa
cket Write, PW) (this is the RAM area 10
5).

Next, the CD-RW drive records the start position, length, track mode, and the like of the track 2 in the PMA, and performs a close session to close the session 1. At this time, a lead-in (Lead-In) and a lead-out (Lead-Out) are recorded. Then, the dummy data recorded on the track 1 is erased.

According to this, since the PMA is recorded on the phase change type recording layer (that is, because it is recorded on the RAM area), the drive including the drive for rewriting the PMA area is included.
The advantage is that any drive can be used. The read-only area stores information in the pre-pit row 60.
Therefore, there is an advantage that a read-only area can be easily configured and information recorded in the read-only area can be prevented from being accidentally erased.

In the above-described method, the CD-RW driver
The case where formatting is performed by writing MA, lead-in, and lead-out has been described, but the present invention is not limited to this.
If writing to MA, lead-in, and lead-out is possible, formatting may be performed as follows.

Here, in FIG. 4B, in the management area 101 and the user area 102 of the CD-RW disc 100, the portion recorded by the pits (pre-pit rows) 60 has a dark pattern, and the phase change type recording is performed. The portion recorded by forming an amorphous mark in the layer 52 is shown as a thin pattern. First, as shown in FIG.
MA, lead-in, track 1 data, and lead-out are recorded in a pit (pre-pit string) 60 (this is R
OM area 104).

Then, using a CD-RW drive, data of track 2 is recorded by packet write (Packet Write, PW) following the gap 1 formed by performing a close track to close track 1 (Packet Write, PW). This is the RAM area 105). According to this,
As described above, there is no need to record dummy data on the track 1 or to erase the dummy data, so that there is an advantage that formatting can be performed in a short time. Further, since the read-only area is configured as the ROM area 104 for recording information by a pre-pit string, the read-only area can be easily configured, and the information recorded in the read-only area may be erased by mistake. There is an advantage that can be prevented.

In this embodiment, the CD-RW disc 100 stores the ROM area 104 in which the pits 60 record.
And a RAM area 105 for forming and recording an amorphous mark on the phase-change recording layer 52, so that the read-only area is the ROM area 104.
The CD-RW disc 10 is not limited to this.
0 is configured as having only the RAM area 105 described above, the data of track 1 and the data of track 2
Is recorded by forming an amorphous mark in the phase-change recording layer 52, and the data of the track 1 is set as non-rewritable read-only data by, for example, a device driver. By doing so, the area where the data of the track 1 is recorded may be set as the read-only area. In this case, formatting may be performed as follows.

Here, in FIG. 4C, of the management area 101 and the user area 102 of the CD-RW disc 100, a portion set as read-only data (a portion which is prohibited from being rewritten) has a dark pattern. Other parts are shown as thin patterns. First, as shown in FIG.
Using a CD-RW drive, the data of track 1 is recorded at track-at-once (Track At Once, TAO) (this is the RAM area 105), and gap 1 is created by performing a closed track to close track 1. Provided.

Here, Track At Once (Track At Once)
Once), since the data recorded once cannot be rewritten except for erasing the entire surface of the disk, the data is effectively rewrite-protected data (reproduction-only data). Therefore, the area where the data of the track 1 is recorded becomes the reproduction-only area. . Next, CD
-The RW drive stores the start position of track 1 in the PMA,
The length and the track mode are recorded.

Next, using a CD-RW drive, format data as data of track 2 is recorded by packet write (PW) (also R
AM area 105). Next, the CD-RW drive records the start position, length, track mode, and the like of the track 2 in the PMA, and performs a close session to close the session 1. At that time, the lead-in (Le
ad-In) and Lead-Out are recorded.

According to this, there is an advantage that an information recording medium having a read-only area 104 and a rewritable area 105 can be realized even if it does not have the ROM area 104 for recording by the pre-pit row 60. Next, a detailed example of a hybrid CD-RW structure, that is, a detailed example of a volume arrangement of a CD-RW (optical disk) in which a volume structure conforming to ISO9660 and a volume structure conforming to UDF are mixed (coexisting) is shown in FIG. This will be described with reference to FIG.

In the volume layout diagram shown in FIG. 6, the program area 107 is mapped, and the program area 107 is a data recording area having an ISO9660 structure (mainly, an area of LBA = 22 to 24839).
A management information recording area of the ISO9660 structure (mainly, an area of LBA = 16 to 18), a data recording area of the UDF structure (mainly, an area of LBA = 27168 or later), and a management information recording area of the UDF structure (mainly, L
BA = 19-21,256,24992-27136
N-256, N).

Here, the volume layout diagram (U
LBA (Logical B) is on the left side of DF Volume Structure.
lock Address), and a descriptor name (descriptor, Descriptor) is provided on the right side. Among them, LBA is a logical block number, and CD-RW
This is the address of the program area 107 of the disk 100, and scales from 0 to N in units of 2048 bytes. In this way, the reason why 2048 bytes is set is
It corresponds to a logical sector which is a basic unit of data. N is a natural number and corresponds to the last sector address of the volume.

The descriptor (descriptor) is for distinguishing a plurality of pointer areas or value (value itself) areas. In the pointer area to which the descriptor is attached, a pointer (predetermined LBA value) or a value to a location where the management information is distributed and written is stored, and the index function is performed. I have. That is, the recording / reproducing apparatus can quickly access each of the distributed and written portions. Note that the recording / reproducing device refers to a device capable of irradiating a recording laser beam to the CD-RW disc 100 to record data, and reproducing by reading reflected light of the irradiated laser beam, In the following description, the same meaning is used.

Hereinafter, each descriptor (each descriptor) will be described with reference to FIG. Here, ISO9
As shown in FIG. 6, (1) Primary Volume Descriptor (Primary Volume Descriptor; LBA = 16) is stored in the management information recording area having the 660 structure.
(2) Supplementary Volume Descriptor (LBA = 17)
And (3) Volume Descriptor Set Terminator (LBA)
= 18) is recorded. In addition, this ISO966
In the management information recording area having the 0 structure, a boot record (Boot record) is stored.
Record).

The data recording area of the ISO9660 structure is mainly an area of LBA = 22 to 24839, and is an area where the user can actually write data. In the present embodiment, the management information recording area and the data recording area of the ISO9660 structure have the R
As a track 1 recorded in the OM area 104, it is recorded at track-at-once. This is because the data to be recorded in the ROM area 104 is assumed to be, for example, an application program, and such data is desirably recorded by track-at-once in the ISO9660 structure. is there.

Among these, (1) Primary Volume Descriptor (Primary Volume Descriptor) includes:
A position such as a root directory or a path table recorded in ISO9660 is recorded. In addition, this Primary Volume Descriptor (Primary Volume Descriptor)
Is a format as shown in FIG.

(2) A supplementary volume descriptor (Supplementary Volume Descriptor) includes:
Positions such as a root directory and a path table recorded in the ISO9660 structure are recorded. In addition, this supplementary
Supplementary Volume D
escriptor) has a format as shown in FIG.

(3) Volume Descriptor Set Terminator
r) contains the volume descriptor (Volume Descri
ptor). This volume descriptor set terminator (Volume Descrip
tor Set Terminator) has a format as shown in FIG.

As shown in FIG. 6, in the data recording area of ISO9660, an area in which a file (File) or a directory (Directory) is recorded (LBA = 22 to 2).
9, 33 to 255, 257 to 24839) and (7) Type L Path Table (LBA = 3)
0) and (8) Type M Path Table
ble; LBA = 31) and (9) the root directory (R
oot Directory; LBA = 32).

Among them, (7) the Type L Path Table is a path table of ISO9660 written in a format that becomes the lowest value when the byte value of the first address is represented by a hexadecimal number. Path Table). (8) Type M Path Tabl
e) is a path table (Path Table) of ISO9660 written in a format in which the byte value of the first address becomes the highest value in hexadecimal notation.

Here, the path table (Path Table) is
It contains the directory location, name, etc.,
The format is as shown in FIG. (9) The root directory is a root directory recorded in ISO9660.
It is. This root directory (Root Directo)
ry) has a format as shown in FIG.

Although the area where the file (File) or the directory (Directory) is recorded is divided into three areas here, the present invention is not limited to this, and the file (File) or the directory (Directory) may be divided into three areas. Area to be recorded, (7) Type L Path Table
e) and (8) Type M Path Tab
le) and (9) Root Directory
Can be set arbitrarily. For example, (7) a type L path table (Type L Path Table), (8) a type M path table (Type M Path Table), and (9) a root directory (Root Directory) are arranged in LBA = 22 to 24, An area in which a file (File) or a directory (Directory) is recorded may be provided in LBA = 25 to 255.

As shown in FIG. 6, the management information recording area of the UDF structure includes an area (LBA = 19 to 21) for defining a volume descriptor and an LBA = 25
6 first anchor volume descriptor (An
chor Volume Descriptor) and the LBA
= 24994 to 24997 in which a main volume descriptor (Main Volume Descriptor) is recorded, and LBA = 25024 to 25029 in a Reserve Volume Descriptor.
r) and a logical volume integrity descriptor (Logi) of LBA = 25056
cal Volume Integrity Descriptor), and a sparing area (Sparing Area) of LBA = 26112 to 27136.

Here, in the present embodiment, the area (LBA = 19 to 21) that defines the volume descriptor contains (4) as a specific element of the UDF management information.
Beginning Extended Area Descriptor, (5) N
DR Descriptor (NSR Descriptor), (6) Terminating Extended Area Descriptor, 1st
Anchor Vol Descriptor
ume Descriptor), as shown in FIG.
The track 1 recorded in the ROM area 104 in the state of being mixed with the zero structure is recorded at the track-at-once with the ISO9660 structure. It should be noted that the area defining the volume descriptor may include a boot record.

This is because (4) Beginning extended area descriptor (Beginning) as a specific element in the management information of the UDF structure
Extended Area Descriptor), (5) NDR Descriptor (NSR Descriptor), (6) Terminating
Extended Area Descriptor (Terminat
ing Extended Area Descriptor) and (10) the first anchor volume descriptor (Anchor Volume Descriptor).
scriptor) is not of a nature that requires rewriting every time data (file) is rewritten like other management information, but is basically used to access data (files and directories) recorded by UDF. Because the management information is different, it is prevented from being accidentally deleted.

In particular, (4) Beginning Extended Area Descriptor (Beginning Extended Area Descriptor)
a Descriptor), (5) NDR Descriptor (NSR Descriptor)
scriptor), (6) Terminating Extended Area Descriptor (Terminating Extended Area Descriptor)
Area Descriptor) is (1) Primary Volume Descriptor (LBA = 16) of the management information recording area of the ISO9660 structure,
(2) Supplementary Volume Descriptor (LBA = 17)
And (3) Volume Descriptor Set Terminator (LBA)
= 18), specifically, (3) Volume Descriptor Set Terminator (Volume Descrip
(4) Beginning Extended Area Descriptor (4) Beginning Extended Area Descriptor is added to the logical address immediately after tor Set Terminator (LBA = 18).
or), followed by (5) NDR descriptor (NS
R Descriptor), (6) Terminating Extended Area Descriptor
nded Area Descriptor).

(10) The first anchor volume descriptor (Anchor Volume Descriptor) is:
LBA = 256 defined by the UDF standard. On the other hand, LBA = 24992 to 24997 as an element other than the specific element in the management information of the UDF structure
Main Volume Descriptor (Main Volume Descriptor)
Descriptor), Reserve Volume Descriptor (Reserve Volume D) with LBA = 25024 to 25029
escriptor), LBA = 25056 Logical Volume Integrity Descriptor (Logical Volume)
Integrity Descriptor), LBA = 2612-27
The sparing area (Sparing Area) 136 is shown in FIG.
As shown in the figure, as the track 2 recorded in the RAM area 105, it is recorded by the packet write as described above.

The data recording area of the UDF is mainly an area after LBA = 27168, and is called a partition or a logical volume, and is an area where a user can actually write data. In the present embodiment, the track 2 recorded in the RAM area 15
As described above, it is recorded by packet writing.

Hereinafter, each descriptor (descriptor) will be described in more detail. First, in FIG. 6, the volume descriptor definition area (LBA = 19 to 2)
The descriptor recorded in 1) is (4) Beginning extended area descriptor (Beginn
ing Extended Area Descriptor, LBA = 19; for example, a value such as “BEA01” is stored),
(5) NDR descriptor (NSR Descriptor, LBA
= 20; for example, a value such as “NSR02” is stored), (6) Terminating Extended Area Descriptor (Terminating Extended Area Descriptor)
Area Descriptor, LBA = 21; a value such as “TEA01” is stored), and is read when the CD-RW disc 100 uses the UDF format.

Here, (4) Beginning Extended Area Descriptor (Beginning Extended A)
rea Descriptor; LBA = 19) is an extended area descriptor (Extended Area Descriptor).
This indicates the beginning (start) of r). Also, (5) N
DR descriptor (NSR Descriptor, LBA = 20)
Indicates that the data is recorded in UDF (IEEE13346). In addition, (6) Terminating Extended Area Descriptor (Term
inating Extended Area Descriptor, LBA = 21)
Is an extended area descriptor (Exte
nded Area Descriptor).

Here, these descriptors (descriptors) will be described with reference to FIGS. 12 (a) to 12 (c). FIG. 12A shows a volume structure descriptor (Volume Structure Descriptor).
FIG. 4 is a diagram illustrating a format of a redescriptor. The BP (Byte Position) shown in FIG.
It indicates the start position of an 8-byte sector.
A standard identifier (Standard Identifier) is written in the area marked with BP = 1 (the area with BP = 1).
FIG. 12B shows the standard identifier (Standard Identifier).
ifier), for example, "CD00
A value of "1" indicates that the disc has been written in the ISO9660 format used in the CD-ROM format standard. And, the above-mentioned Beginning Extended Area Descriptor (Beginning Extended Area Descriptor) Is a format as shown in FIG.

Next, the (10) first anchor volume descriptor (Lanchor Volume Descriptor) of LBA = 256
Descriptor) means that the disk handled by the recording / reproducing device is UDF
This format indicates that the main volume descriptor (Main Volume Descriptor) recorded by UDF (IEEE 13346) is used in this area.
riptor; LBA = 24992 to 24997) and reserve volume descriptor (Reserve Vo)
lume Descriptor; LBA = 25024-25029)
And the like indicating the start position of the data.

FIG. 13A shows an anchor volume descriptor pointer (AnchorVolume Descriptor Po).
FIG. 11 is a diagram showing a format of (inter), in which a start position of a main volume descriptor is written in BP = 16, and a start position of a reserve volume descriptor is written in BP = 24. In addition, Anchor Volume Descriptor
ptor) is LBA = 256 in addition to LBA = 256.
6, LBA = N, and are usually provided at three places in total. Here, the anchor volume descriptor (Anchor Vol. Descriptor) located at LBA = N-256
ume Descriptor) is referred to as (10-2) second anchor volume descriptor, and the anchor volume descriptor (Anchor) located at LBA = N
Volume Descriptor) (10-3) Third anchor
It is called a volume descriptor. At least two of these must be provided.

Further, as shown in FIG. 6, the main volume descriptor (Main Volume Descriptor) contains
(11) Primary volume descriptor (Pr
imary Volume Descriptor) and (12) Logical Volume Descriptor
r) and (13) Partition descriptor (Par
(14) Unallocated Space Descriptor and (14) Unallocated Space Descriptor
riptor) and (15) Implementation Use Volume Descriptor (Implementation Use V)
olume Descriptor) and (16) Terminating
A descriptor (Terminating Descriptor) is recorded.

In particular, the start address (LB) of the main volume descriptor (Main Volume Descriptor)
A), that is, the start address (LBA) of track 2 is 3
It is set to be a number divisible by 2. That is, the LBA value Y of the start address of the track 2 is stored in the ROM
Assuming that the number of blocks in the area 104 is M and the number of blocks of the original data is N, the number is obtained by the following equation.

Y = M + 152 M = INT [(N + 152 + 31) / 32] × 32-152 Here, the gap between tracks is 2 seconds, which is 1 second.
This corresponds to 50 blocks (75 blocks × 2), and since there are two run-out blocks, there are 152 blocks between tracks.

When the UDF device driver supports the case where the packet start address is not divisible by 32, there is no need to set the track 2 start address in this way. Here, LBA = 24 shown in FIG.
992 Primary Volume Descriptor (Pr
imary Volume Descriptor) is UDF (IEEE13
346) indicates the existence of the volume recorded, and specifies the volume and indicates the attribute of the volume. The Primary Volume Descriptor is LB
A = 24997 UDF (IEEE 1334)
6) Volume Descripto
The start of the pointer area is indicated in cooperation with a terminating descriptor indicating the end of r). FIG. 15B shows the format of the primary volume descriptor, in which information necessary for managing the volume is written.

In FIG. 6, a logical volume descriptor (Logical Volume Descriptor) of LBA = 24993
me Descriptor) records the name and capacity of the volume. That is, the pointer to the location where the number of partition areas, the Logical Volume Integrity Descriptor (Logical Volume Integrity Descriptor) is recorded, the number of sparing tables, the size and position of the sparing table, etc. are written. Have been. This Integrity Sequence Ext Location
The pointer called “ent Location” is always rewritten each time the recording / reproducing system rewrites.

Subsequently, in the partition descriptor (Partition Descriptor) of LBA = 24994, the start position of the partition, the length of the partition, and the like are written. FIG. 14A shows the format of this partition descriptor. Further, the unallocated LBA = 24995 in FIG.
Unallocated Space Descri
ptor) records unused locations. That is, the LBA value of the area (use prohibited area) where use by the recording / reproducing apparatus is prohibited is written. FIG.
(B) shows the format of the unallocated space descriptor.

In FIG. 6, LBA = 24996
Implementation Use Volume Descriptor
In the field, information written by software for recording and reproducing the CD-RW disc 100 is written. Specifically, a company name and version of the software are written.
This is used by tools that create UDF (IEEE 13346) volumes.

Further, LBA = 25024 to 25029
Reserve Volume Descriptor (Reserve Vo)
lume Descriptor) records the same as the above-mentioned main volume descriptor (LBA = 24992 to 24997). Next, LBA = 25056
What is Logical Volume Integrity Descriptor?
It shows the block size, free size, number of files, number of directories, and the like used in each partition.

FIG. 15A shows a Logical Volume Integrity Descriptor (Logical Volume Integ).
FIG. 3 is a diagram showing a format of a rity descriptor). Recording date, recording time, integrity type, next integrity type, usage status of logical volume contents,
The number of partitions, the implementation length, a free space table, a size table, and an implementation area are shown.

FIG. 15B shows a Logical Volume Integrity Descriptor (Logical Volume Integ).
FIG. 3 is a diagram showing a format of an implementation use area in the RDF (descriptor), and records information such as an ID, the number of files, the number of directories, and a version that can support the UDF format. As a result, the recording / reproducing apparatus firstly operates the logical volume descriptor ((Logical Volume Descriptor; LBA).
= 24993) to the Logical Volume Integrity Descriptor ((Logical Volume Integrity Descriptor)
Descriptor; LBA = 25056) to read the number of files, the number of directories, the UDF version, and the like.

In FIG. 6, LBA = 26112-2
The sparing area (Sparing Area) 7136 is used for defect management. That is, the area where the reading or writing could not be performed normally is to be replaced. Further, information for managing this sparing area is written in (18) Sparing Tables of LBA = 27136.

As described above, a plurality of main pointers are recorded, and the address to be jumped next can be known from the value of the tag written in this area. Next, L
Partition starting from BA = 27168 (Parti
) will be described. First, (19) Space Bitmap Volume Descriptor of LBA = 27168
The “scriptor” indicates whether or not each of a plurality of sectors in the data area has been written. For example, the number of bits or the number of bytes is recorded. FIG. 16 (a)
Space bitmap descriptor (Space Bi
Indicates the format of tmap Volume Descriptor).

Also, (20) File Set Descriptor (LBA = 27200)
r) indicates a file and a directory to be recorded, where the position of the root directory and the like are indicated. FIG. 16B shows a file set file.
FIG. 4 is a diagram showing a format of a descriptor (File Set Descriptor), in which a pointer indicating a location where a specific file is written is recorded.

Further, in FIG. 6, LBA = 2723
2 (21) Root Directory
Is a root directory (Root Directory) of UDF (IEEE13346), and specifically indicates a first file entry (File Entry). Fig. 17
(A) is a diagram showing a format of a file entry (File Entry), in which a file attribute, a location where a file is written, a name of the file, a time stamp, and the like are written. FIG. 17 (b) shows a file identifier descriptor.
3 is a diagram illustrating a format of an ntifier descriptor.

As a result, the recording / reproducing apparatus can read the file
The relative position 64 of the root directory (Root Directory) recorded in the set descriptor (File SetDescriptor) is acquired, and LBA = 27232 obtained by adding 64 to LBA = 27168 is obtained as the root directory (Root Dir).
ectory). The area following the root directory (Root Directory) is used as a data recording area to record user information data, for example, data such as voice.

In the present embodiment, a reserve volume descriptor (Reserve Vod) follows a main volume descriptor (Main Volume Descriptor).
lumeDescriptor), but is not limited to this. Reserve volume descriptors (Reserve Volume Descriptor) are located at a position away from the main volume descriptor (Main Volume Descriptor), for example, at the end of the volume. You may.

In this way, by mixing the ISO9660 structure and the UDF structure on one CD-RW disc 100, the data of the UDF structure and the ISO9660 data are combined.
There is an advantage that it is possible to realize an information recording medium having a read-only area and a rewritable area in which the UDF structure and the ISO9660 structure are mixed, while ensuring access to any data of the structure data.

Since the CD-RW 100 as the information recording medium according to the present embodiment is configured as having the above-described structure, the device driver (recording / reproduction software) also needs to be changed. In other words, the data of the ISO9660 structure in the ROM area 104 is
On the other hand, the data of the UDF structure in the RAM area 105 can be recorded / reproduced by the UDF driver, while the data can be reproduced by the UDF driver. For this reason, ISO9660
It is necessary to have a driver having both functions of the driver for the UDF and the driver for the UDF.

Here, the ISO 9 in the ROM area 104
The file entry (File Entry) of the file and directory (folder) 660 is stored in the U of the RAM area 105.
It may be recorded as a file entry (File Entry) of a DF file and a directory (folder), and set as read-only data (reproduction-only data) by, for example, a device driver. By recording in such a special arrangement, even a driver that does not have the function of the ISO9660 driver can read the files and directories of ISO9660.

Using a driver (CD-RW driver, optical disk driver) having both functions of the ISO9660 driver and the UDF driver, search (display), writing, and reading are performed as follows. Done. First, the operation of the driver at the time of searching (displaying) a file (or folder) will be described with reference to FIG.

Search (display) of file (or folder)
Sometimes, first, as shown in FIG.
Search for the first file using the UDF function of the driver. That is, first, the driver uses the UDF function to perform (4) a Beginning Extended Area Descriptor of the UDF structure on the CD-RW disc 100,
(5) NSR Descriptor,
(6) Terminating Extended Area Descriptor
riptor), (10) first anchor volume descriptor (Anchor Volume Descriptor), (10-
2) Second anchor volume descriptor (An
chor Volume Descriptor, (10-3) Third Anchor Volume Descriptor
riptor), (11) Primary Volume Descriptor, (13) Partition Descriptor
r), (16) Terminating descriptor (T
erminating Descriptor), (20) File Set Descriptor, (21)
Read the Root Directory in order and access the first file (or folder).

Note that, here, the driver first uses the UDF
I try to search for files using the function,
This is, for example, ISO96 in Windows (trade name).
The driver for 60 is included from the beginning, the driver for UDF is to be inserted later, and the UD
This is because the driver for F functions preferentially. For this reason, the present invention is not limited to this, and the file search may be performed first using the ISO9660 function.

Next, at step S20, it is determined whether or not the file (or folder) exists at the accessed location. If the result of this determination is that the file (or folder) exists, Information (for example, a file name) related to (or a folder) is displayed on a display. Then, the process proceeds to step S30 to search for the next file (or folder) using the UDF function of the driver. That is, the driver reads (21) the root directory (Root Directory) and accesses the next file (or folder).

Next, in step S40, it is determined whether or not the file (or folder) exists at the accessed location. As a result of this determination, if it is determined that the file (or folder) exists, Information (for example, a file name) related to (or a folder) is displayed on a display. Then, in order to search for the next file (or folder) using the UDF function of the driver,
Returning to step S30, thereafter, until it is determined that the next file (or folder) does not exist, step S3 is performed.
0, the processing of S40 is repeated.

When it is determined in step S20 that the first file (or folder) does not exist,
Alternatively, if it is determined in step S40 that the next file (or folder) does not exist, step S5
Go to 0. In step S50, the driver's ISO96
First file (or folder) using 60 functions
Search for. In other words, first, the driver operates the (1) Primary Volume Descriptor (Primary Volume Descriptor) of the ISO9660 structure on the CD-RW disc 100.
iptor), (2) Supplementary Volume Descriptor,
(3) The volume descriptor set terminator (Volume Descriptor Set Terminator) and (9) the root directory (Root Directory) are sequentially read to access the first file (or folder).

Next, in step S60, it is determined whether or not the file (or folder) exists at the accessed location. If it is determined that the file (or folder) exists, The information (for example, a file name, etc.) about the (or folder) is displayed on the display. Then, the process proceeds to step S70 to search for the next file (or folder) using the ISO9660 function of the driver. That is, the driver uses (9)
Read the Root Directory,
Access the next file (or folder).

Next, in step S80, it is determined whether or not the file (or folder) exists at the accessed location. If it is determined that the file (or folder) exists, Information (for example, a file name) relating to (or a folder) is displayed on a display. And the driver's ISO966
In order to search for the next file (or folder) using the 0 function, the process returns to step S70, and thereafter, the processing of steps S70 and S80 is repeated until it is determined that the next file (or folder) does not exist.

When it is determined in step S60 that the first file (or folder) does not exist, or in step S80, the next file (or folder) is not found.
If it is determined that there is no file (or folder), the driver ends the search (display) process because there is no file (or folder). Next, the operation of the driver when writing a file (or folder) will be described with reference to FIG.

When writing a file (or folder), as shown in FIG. 19, first, in step A10, a file (or folder) having the ISO9660 structure on the CD-RW disc 100 is searched using the ISO9660 function of the driver. I do. In other words, the driver first
(1) Primary volume descriptor (Prim
aryVolume Descriptor), (2) Supplementary Volume Descriptor
iptor), (3) Volume Descriptor Set Terminator
r), (9) Read the root directory (Root Directory) in order and access the file (or folder).

Next, in step A20, it is determined whether or not a file (or folder) exists at the accessed location. If the result of this determination is that the file (or folder) exists, step A30 Then, the driver returns an error to the operating system and ends the writing process. On the other hand, if it is determined in step A20 that the file (or folder) does not exist,
In step A40, a file (or folder) on the CD-RW disc 100 is searched using the UDF function of the driver. That is, first, the driver is a CD-R
(4) Beginning extended area descriptor (Beginnin) of the UDF structure of the W disk 100
g Extended Area Descriptor), (5) NSR Descriptor (NSR Descriptor), (6) Terminating Extended Area Descriptor (Term)
inating Extended Area Descriptor), (10) First anchor volume descriptor (AnchorVolume)
Descriptor), (10-2) Second anchor volume descriptor (Anchor Volume Descriptor),
(10-3) Third Anchor Volume Descriptor, (11) Primary Volume Descriptor
criptor), (13) Partition Descriptor, (16) Terminating Descriptor, (2)
0) File set descriptor
criptor), (21) Root directory (Root Direct)
ory) in order and access the file (or folder).

Next, in step A50, it is determined whether or not a file (or folder) exists at the accessed location. If the result of this determination is that the file (or folder) does exist, step A60 Then, it is determined whether or not to overwrite (that is, whether or not there is a command to overwrite). As a result of this determination, when it is determined that the file is to be overwritten (that is, when it is determined that there is an instruction to overwrite), the process proceeds to step A70, and the file (or folder) is written using the UDF function of the driver.
Overwrite. In other words, the driver uses the UDF structure of the CD-RW disc 100 (11) Primary Volume Descriptor,
(13) Partition Descriptor (Partition
Descriptor), (14) Unallocated Space Descriptor,
(16) Terminating Descriptor (Termin
ating Descriptor), (17) Logical volume
Integrity Descriptor (Logical Volume Int
egrity Descriptor), (18) Sparing Tables, (19) Space Bitmap Descriptor, (2)
0) File Set Descriptor
criptor), (21) Root directory (Root Direct)
ory) is read in order, the file (or folder) is overwritten, and the writing process ends.

On the other hand, if it is determined in step A60 that overwriting is not to be performed (that is, if it is determined that there is no instruction to overwrite), the process proceeds to step A80, where the driver returns an error to the operating system and performs the writing process. finish. If it is determined in step A50 that the file (or folder) does not exist, the process proceeds to step A90, and the file (or folder) is overwritten using the UDF function of the driver. In other words, the driver determines (11) Primary Volume Descriptor, (13) Partition Descriptor, (1) of the UDF structure of the CD-RW disk 100
4) Unallocated Space Descriptor, (16) Terminating Descriptor
r), (17) Logical Volume Integrity Descrip
tor), (18) Sparing Table
s), (19) Space Bitmap Descriptor, (20) File
Set Descriptor (File Set Descriptor),
(21) Read the root directory (Root Directory) in order, overwrite the file (or folder), and end the writing process.

Next, the operation of the driver when reading a file (or folder) will be described with reference to FIG. When reading a file (or folder), as shown in FIG. 20, first, in step B10, a file (or folder) to be read is searched for using the UDF function of the driver. That is, first, the driver
(4) Beginning extended area descriptor (Be) of the UDF structure of the D-RW disc 100
ginning Extended Area Descriptor), (5) NSR Descriptor (NSR Descriptor), (6) Terminating Extended Area Descriptor, (1)
0) First anchor volume descriptor (An
chor Volume Descriptor, (10-2) Second anchor volume descriptor (Anchor Volume Desc)
riptor), (10-3) Third anchor volume
Descriptor (Anchor Volume Descriptor), (1
1) Primary volume descriptor (Primar
y Volume Descriptor, (13) Partition Descriptor, (16) Terminating Descriptor
ptor), (20) a file set descriptor (File Set Descriptor), and (21) a root directory (Root Directory), and sequentially access the file (or folder).

Next, at step B20, it is determined whether or not a file (or folder) exists at the accessed location. As a result of this determination, if it is determined that the file (or folder) exists, step B30 Go to the file (or folder) using the UDF function of the driver
Read. That is, the driver reads (21) the file (or folder) accessed via the root directory (Root Directory), and ends the reading process.

On the other hand, if it is determined in step B20 that the file (or folder) does not exist, the flow advances to step B40 to search for a file (or folder) to be read by using the ISO9660 function of the driver. In other words, first, the driver
(1) Primary Volume Descriptor of SO9660 structure (2)
Supplementary Volume Descriptor (Supple
mentary Volume Descriptor), (3) Volume Descriptor Set Terminator (Volume Descripto)
r Set Terminator), (9) Root directory (Root
Directory) is read in order to access the file (or folder).

Next, at step B50, it is determined whether or not the file (or folder) exists at the accessed location. As a result of the determination, if it is determined that the file (or folder) exists, the process proceeds to step B60. Then, the file (or folder) is read using the ISO9660 function of the driver. That is, the driver (9) reads the file (or folder) accessed via the root directory (Root Directory), and ends the reading process.

On the other hand, if it is determined in step B50 that the file (or folder) does not exist, the process proceeds to step 70, where the driver returns an error to the operating system and ends the reading process. According to such a search, write, and read method, a read-only area in which the UDF structure and the ISO9660 structure are mixed while ensuring access to both the data having the UDF structure and the data having the ISO9660 structure. And an information recording medium having a rewritable area.

According to the information recording medium and the recording / reproducing method of the information recording medium according to the present embodiment, UDF or ISO96
A RAM having a ROM area 104 as a read-only area and a RAM area 105 as a rewritable area while allowing data to be recorded while reducing the capacity as much as possible in consideration of the standard such as 60 or a data writing method. / RO
There is an advantage that the M mixed disk 100 can be realized.

The CD-R constructed as described above
W100 reproduces data such as an application program from the ROM area 104, executes a predetermined process based on the program, and immediately transmits the result to the RAM area 1
05 is assumed, the track 1 in the ROM area 104 and the RAM area 105 are used.
Access to data reproduction / recording can be frequently performed with the track 2 of the data.

At the same time, the ISO9660 format is important for maintaining compatibility with the CD-ROM, which is the most widely used optical disk system which is almost completely built in computers and shipped. Further, a device driver (and a program for installing the device driver) that handles the UDF format, which is not necessarily widely used, is stored in a ROM in an ISO9660 format accessible from a normal CD-ROM device driver.
A usage method of recording the data as data, reading the program into a host computer, and installing a UDF device driver is also assumed.

In the above embodiment, the CD-RW has been described as an example of the information recording medium. However, the present invention is not limited to this. For example, another information recording medium such as a DVD-RAM (optical recording medium) may be used. ). In the above-described embodiment, the track 1 is the ROM area 104,
Track-at-once in the ISO9660 format, track 2 in the RAM area 105, and packet writing in the UDF structure are not limited to this, but the track 1 is in the RAM area 105, packet writing in the UDF structure, and track 2 in the UDF structure. In the ROM area 104
It is also possible to adopt a track-at-once with an ISO9660 structure. If the first track 1 has an ISO9660 structure as in the above-described embodiment, the ISO9660 structure is more effective.
It is easy to follow the file management method of the 60 format.
This is because, in ISO9660, information on a logical address (LBA = 16) at the beginning of the program area is obtained first.

In the above-described embodiment, the track-at-once has the ISO9660 structure, and the packet-write has the UDF structure. However, the present invention is not limited to this. When the packet write is used, the IS
An O9660 structure may be used. In addition, both the track-at-once and the packet-write modes are based on ISO9.
660 structure, or conversely, track-at-once, packet write, or UDF structure.

It should be noted that the present invention is not limited to the above-described embodiment, but may be made within the scope of the present invention.
Various modifications can be made. For example, one C
The volume arrangement in the case where the ISO9660 structure and the UDF structure coexist on the D-RW 100 is not limited to the above-described embodiment, and is designed within a range conforming to the standard based on various design policies. It can be implemented.

[0147]

According to the information recording medium of the present invention, in consideration of the data writing method and the like, the data can be recorded while saving the capacity as much as possible, and the data is recorded in the read-only area. There is an advantage that an information recording medium having a rewritable area can be realized.

According to the information recording medium of the present invention, both the UDF structure data and the ISO9660 structure data can be reliably accessed, while the UDF structure and the ISO9660 structure can be accessed. There is an advantage that it is possible to realize an information recording medium having a read-only area and a rewritable area in which are mixed. In particular, claim 5
According to the described information recording medium of the present invention, there is an advantage that it can be used with various types of drivers.

According to the information recording medium of the present invention, there is a drive for rewriting the PMA area, but there is an advantage that any drive including such a drive can be used. Further, since the read-only area is configured as the ROM area 104 in which information is recorded by the pre-pit row 60, the read-only area can be easily configured, and the information recorded in the read-only area is erased by mistake. This has the advantage that it can be prevented.

According to the information recording medium of the present invention, since it is not necessary to record and erase the dummy data to format the rewritable area, there is an advantage that the formatting can be performed in a short time. is there. A read-only area is a ROM in which information is recorded by a pre-pit string.
Since it is configured as an area, there is an advantage that the read-only area can be easily configured and information recorded in the read-only area can be prevented from being accidentally erased.

According to the information recording medium of the present invention, an information recording medium having a read-only area and a rewritable area can be realized even if the information recording medium does not have a ROM area for recording by a pre-pit string. There is an advantage. According to the information recording medium of the present invention, even if the UDF structure and the ISO9660 structure are mixed, both the UDF structure data and the ISO9660 structure data can be reliably accessed. This has the advantage that an information recording medium having a read-only area and a rewritable area can be realized.

According to the information recording medium of the present invention, even if the UDF structure and the ISO9660 structure are mixed, both the UDF structure data and the ISO9660 structure data can be reliably accessed. As a result, there is an advantage that an information recording medium having a read-only area and a rewritable area can be realized. According to the information recording medium of the present invention, there is an advantage that it can be used by various types of drivers.

According to the recording / reproducing method of the information recording medium of the present invention, the data of the UDF structure and the
The UDF structure and the ISO while ensuring that any data of the SO9660 structure can be accessed.
There is an advantage that an information recording medium having a read-only area and a rewritable area in which the 9660 structure is mixed can be realized.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of an arrangement of a management area and a data area of a CD-RW as an information recording medium according to an embodiment of the present invention.

FIG. 2 is a schematic sectional view showing a CD-RW as an information recording medium according to one embodiment of the present invention.

FIG. 3 is a diagram for explaining each area of the information recording medium according to one embodiment of the present invention.

FIG. 4 is a diagram for explaining a configuration example of each area of the information recording medium according to one embodiment of the present invention,
(A) is a case where only track 1 is composed of pits in a CD-RW having a ROM area, and (B) is a ROM.
PMA, lead-in,
Tracks 1 and lead-outs are composed of pits, and FIG. 3C shows a case of a CD-RW having no ROM area.

FIG. 5 is a diagram illustrating a C of an information recording medium according to an embodiment of the present invention.
It is a figure which shows the structural example at the time of mixing ISO9660 structure and UDF structure in D-RW.

FIG. 6 is a diagram illustrating an information recording medium according to an embodiment of the present invention.
FIG. 11 is a diagram illustrating an example of a volume arrangement in which an ISO9660 structure and a UDF structure are mixed in a D-RW.

FIG. 7 is a diagram showing a format of a primary volume descriptor having an ISO9660 structure applied to an information recording medium according to an embodiment of the present invention.

FIG. 8 is a diagram showing a format of a supplementary volume descriptor having an ISO9660 structure applied to an information recording medium according to an embodiment of the present invention.

FIG. 9 is a diagram showing a format of a volume descriptor set terminator having an ISO9660 structure applied to an information recording medium according to an embodiment of the present invention.

FIG. 10 is a diagram showing a format of a path table having an ISO9660 structure applied to an information recording medium according to an embodiment of the present invention.

FIG. 11 is a diagram showing a format of a root directory having an ISO9660 structure applied to an information recording medium according to an embodiment of the present invention.

12A and 12B show a format of a UDF structure applied to an information recording medium according to an embodiment of the present invention, wherein FIG. 12A is a diagram showing a format of a volume structure descriptor, and FIG. It is a figure which shows the value of a standard identifier, (c) is a figure which shows the format of a beginning extended area descriptor.

FIG. 13 shows a format of a UDF structure applied to an information recording medium according to an embodiment of the present invention, wherein (a) shows an anchor volume descriptor;
It is a figure which shows the format of a pointer, (b) is a figure which shows the format of a primary volume descriptor.

14A and 14B show a format of a UDF structure applied to the information recording medium according to one embodiment of the present invention, wherein FIG. 14A is a diagram showing the format of this partition descriptor, and FIG. It is a figure which shows the format of an allocated space descriptor.

FIGS. 15A and 15B show a format of a UDF structure applied to the information recording medium according to the embodiment of the present invention, wherein FIG. 15A is a diagram showing a format of logical volume integrity, and FIG. It is a figure showing the format of the implementation use area in a logical volume integrity descriptor.

16A and 16B are diagrams showing a format of a UDF structure applied to the information recording medium according to the embodiment of the present invention, wherein FIG. 16A is a diagram showing a format of a space bitmap descriptor, and FIG. FIG. 4 is a diagram showing a format of a file set descriptor.

FIGS. 17A and 17B show a format of a UDF structure applied to the information recording medium according to an embodiment of the present invention, wherein FIG. 17A is a diagram showing a file entry format, and FIG. It is a figure which shows the format of a Tifa descriptor.

FIG. 18 is a flowchart for explaining an operation when searching (displaying) a file (or folder) from the information recording medium according to an embodiment of the present invention.

FIG. 19 is a flowchart illustrating an operation when writing a file (or folder) to an information recording medium according to an embodiment of the present invention.

FIG. 20 is a flowchart for explaining an operation when reading a file (or folder) from the information recording medium according to one embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 50 substrate (disk substrate) 51, 53 protective film 52 phase-change recording layer 54 reflective film 55 protective coat 60 pit (or pre-pit row) 61 groove (guide groove) 100 disk (information recording medium) 101 management area 102 user area 103 Lead-in area 104 ROM area (reproduction-only area) 105 RAM area (rewritable area) 106 Lead-out area 107 Program area (data area)

Claims (14)

[Claims] A phase change type recording layer is provided on a substrate in which a portion in a crystalline state is an unrecorded state / erased state and a portion in an amorphous state is a recorded state. And a rewritable area, wherein the read-only area is configured by continuously recording information, and the rewritable area is configured by discretely recording information; An information recording medium, wherein a transition area is provided between a dedicated area and the rewritable area. 2. The information recording medium according to claim 1, wherein the read-only area is configured as an ISO9660 structure, and the rewritable area is configured as a UDF structure. 3. In the read-only area, management information and data of ISO9660 structure are recorded, and UDF
A specific element of the management information of the structure is recorded, and an element other than the specific element of the management information of the UDF structure and the data of the UDF structure are recorded in the rewritable area. The information recording medium according to claim 1. 4. The information recording medium according to claim 3, wherein the specific element includes a beginning extended area descriptor, an NSR descriptor, and a terminating extended area descriptor. 5. The information recording medium according to claim 4, wherein said specific element includes a first anchor volume descriptor. 6. The management information of the ISO9660 structure includes:
A volume descriptor set terminator, wherein the beginning extended area descriptor is recorded at a logical block address next to a logical block address at which the volume descriptor set terminator is recorded. The information recording medium according to claim 4. 7. The read-only area records information by a pre-pit row, and the rewritable area records information by irradiating recording light to the phase-change recording layer to form an amorphous mark. The information recording medium according to any one of claims 1 to 6, wherein the information recording medium is performed. 8. A management area having a PMA, the information recording area includes a lead-in area, a program area, and a lead-out area, and the program area includes the read-only area and the rewritable area. The read-only area, the PMA, the lead-in area,
The lead-out area records information by a pre-pit row, and the rewritable area records information by irradiating recording light to the phase-change recording layer to form an amorphous mark. The information recording medium according to any one of claims 1 to 6, wherein 9. The read-only area and the rewritable area each record information by irradiating the phase-change recording layer with recording light to form an amorphous mark, and wherein the read-only area is The information recording medium according to any one of claims 1 to 6, wherein rewriting is prohibited. 10. A phase-change recording layer in which a portion in a crystalline state is in an unrecorded state / erased state and a portion in an amorphous state is in a recorded state is provided on a substrate. An information recording medium comprising: the user area is configured as one session including a lead-in area, a first track, a second track, and a lead-out area; the first track is configured according to an ISO9660 structure; An information recording medium, wherein the second track has a UDF structure. 11. A phase change type recording layer in which a portion in a crystalline state is in an unrecorded state / erased state and a portion in an amorphous state is in a recorded state is provided on a substrate. And an information recording medium having a rewritable area,
In the read-only area, a primary volume descriptor, a supplementary volume descriptor, a volume descriptor set terminator, and an ISO 9660 structure management information are stored.
9660-structured data is recorded, and beginning extended area descriptors, NSR descriptors, and terminating extended area descriptors as specific elements of the management information of the UDF structure are recorded, and are written in the rewritable area. And an element other than a specific element in the management information of the UDF structure and data of the UDF structure are recorded. 12. The reproduction-only area includes, as a specific element of the management information of the UDF structure, a first anchor
The information recording medium according to claim 11, wherein a volume descriptor is also recorded. 13. A management area and a user area, wherein the user area includes a lead-in area, management information of ISO9660 structure, data of ISO9660 structure, and UD.
A first track in which specific elements of the management information of the F structure are stored, a second track in which elements other than the specific elements of the management information of the UDF structure and data of the UDF structure are stored, and a lead-out area A recording and reproducing method for an information recording medium configured as one session, comprising: accessing the data of the ISO9660 structure based on management information of the ISO9660 structure of the first track; The data is accessed based on a specific element of the management information of the UDF structure of the first track and an element other than the specific element of the management information of the UDF structure of the second track. Recording / reproducing method of information recording medium. 14. The recording / reproduction of an information recording medium according to claim 13, wherein when reading the data recorded in the user area, the data of the ISO9660 structure is read after reading the data of the UDF structure. Method.