JP3222898B2 - Information recording medium and information recording method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording medium having a read-only area for only reproducing recorded information, a recording / reproducing area for recording and reproducing information, and a method for recording information on the information recording medium. It is about.

[0002]

2. Description of the Related Art For the purpose of inexpensively supplying software and editing data to many users, an RO in which data is recorded in advance in a part or the whole of an information recording medium is provided.
M disks have been developed. Regarding the data format of the ROM disk, the Optical Disk Standardization Committee is promoting the standardization for 90 mm rewritable optical disks, and the details are described in the draft proposal (DP10090). FIG. 8 is an area configuration diagram schematically showing a configuration of a user data area in which user data of the disc described in this proposal is recorded. User data area 7
Within the disk, a rewritable area (Rewritable Area) 70 on which data can be recorded after manufacturing the disc and a ROM area (R
OM Area) 71 is allocated.

[0003] Data used by a computer is recorded in a file format on an information recording medium of an external storage device such as a magnetic disk device or an optical disk device. That is,
Data is recorded as a set of the data entity of the file and the directory entry that manages it.

Accordingly, when a file is recorded after manufacturing a disc, the data entity of the file and the directory entry for managing the file are recorded in the rewritable area 70.

[0005]

By the way, in such an optical disk, the information in the ROM area 71 is recorded as an uneven structure along a guide groove on the disk at the time of manufacturing the disk. Regardless of the number of discs to be produced, such optical discs are always produced through a series of disc manufacturing processes from cutting of a master disc corresponding to information in the ROM area 71 to duplication of a disc using a stamper. Therefore,
Considering such a conventional disk manufacturing process, RO
There is a problem that unless a large amount of information is recorded in the M area 71 and the information recorded in the rewritable area 70 is reduced, the manufacturing cost per disc is not reduced.

In addition, the position of a directory entry to be managed is fixed such that the directory entry must exist in a root directory, and a file or directory to be changed cannot be recorded in the ROM area 71 of such an optical disk. Had.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, the present invention provides an information recording medium capable of reducing the amount of data recorded in a rewritable area when a file is created after the information recording medium is manufactured, and a file on the information recording medium after the information recording medium is manufactured. It is an object of the present invention to provide an information recording method which is a method for creating a document.

Further, the present invention provides an information recording medium capable of changing a data entity or a directory of a file in which a position of a directory entry to be managed is fixed after manufacturing the information recording medium, and a data entity or a directory of the file after manufacturing the information recording medium. An object is to provide an information recording method which is a method of changing.

[0009]

[0010]

[0011]

SUMMARY OF THE INVENTION The present invention provides a recording / reproducing area in which data can be written and read, and a recorded data area.
And a reproduction-only area in which only reading of over data is performed, re
In the raw-only area, the directory entries being managed are
Data that is not a collection of data entities from multiple files
Or no directory entry is being managed
An information recording method for recording data on an information recording medium on which data as a collection of directories are recorded.
There is, the data entity of more than one file there is no directory entry that administers or manages that, di
Recognize multiple directories without directory entries
A step, from the data entity or a plurality of directories of a plurality of files recognized, the steps of selecting a data entity or directory of a file, directory entries for managing the data entities or directory of a file selected recorded And a step of writing to the reproduction area.

The present invention also provides a recording / reproducing area in which data can be written and read, and a method for reading recorded data.
Read-only area with a read-only area that allows only
Is the directory entry that manages the recording / playback area.
Is an information recording method for recording data on an information recording medium on which recorded data is recorded, wherein a directory entry in a reproduction-only area managing a recording / reproduction area is
Recognizing step, an information recording method for performing the sector recording and reproduction area of the directory entry recognized manages and writing the data entities or directory of files.

[0013]

According to the present invention, data entities or directories of a plurality of files having no directory entry managed in the read-only area are read, and one of the read entities is selected, and the data entity or the directory of the selected file is selected. By writing a directory entry for managing the file or directory into the recording / reproducing area, the data entity or directory of the file selected in the file or directory reading procedure can be read.

A directory entry in a read-only area that manages the recording / reproducing area is taken out, and the data entity or directory of the file is recorded in the recording / reproducing area managed by the taken-out directory entry. The file data entity or directory can be read from the directory entry.

[0015]

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

FIG. 1 is an area configuration diagram of a first embodiment of the information recording medium of the present invention. FIG. 1 illustrates a case where a file system of MS-DOS, which is an operating system widely used in personal computers, is recorded on an information recording medium. In FIG. 1, reference numeral 1 denotes a reproduction-only area in which recorded data can be reproduced only, and 2 denotes a recording / reproduction area in which data can be recorded and reproduced.
0 is the file data entity and subdirectory location,
FAT (File Allocation Table) in which the use state of the information recording medium such as the position of a free area and the position of a defective area is recorded.
Allocation Table)), 11 is a FAT having exactly the same contents as the FAT 10 recorded to improve reliability, 12 is a root directory area in which a root directory is recorded, and 13 is a file in which data entities and subdirectories of a file are already recorded. The recorded reproduction data area 14 is a recording / reproduction data area in which nothing is recorded and the data entity of the file and the subdirectory are recorded, and 100 is the data substance or subdirectory of the file in which the directory entry to be managed is not recorded. Area 10
Reference numeral 1 denotes an area in which a data entity and a subdirectory of a file managed by the recorded directory entry are recorded.

The area 100 is continuously allocated from the beginning of the data area 13 in order to make it easier to find the recorded position, and one or more sets of data entities of a plurality of files or sets of a plurality of subdirectories are recorded. ing.

The data entity and the subdirectory of the file recorded in the area 101 are stored in the root directory area 1
2 is managed by a directory entry in the root directory recorded in No. 2 or a subdirectory recorded in the area 101.

The sector in the recording / reproducing area 2 may be a sector that can be recorded only once in the same sector or a rewritable sector.

FIG. 2 is an area configuration diagram in a second embodiment of the information recording medium of the present invention. FIG. 2 illustrates a case where an MS-DOS file system, which is an operating system widely used in personal computers, is recorded on an information recording medium. In FIG. 2, reference numeral 5 denotes a read-only area in which only recorded data can be reproduced, 6 denotes a recording / reproducing area in which data can be recorded and reproduced, and 2
0 is the file data entity and subdirectory location,
FAT (File Allocation Table) in which the use state of the information recording medium such as the position of a free area and the position of a defective area is recorded.
Allocation Table)), 21 is a FAT having exactly the same contents as the FAT 20 recorded to improve reliability, 22 is a root directory area in which a root directory is recorded, and 23 is a file in which data entities and subdirectories of a file are already recorded. The recorded reproduction data area 24 has nothing recorded therein, and a recording / reproduction data area for recording the data entity and sub-directory of the file, and 200 has a directory entry for managing sectors in the recording / reproduction data area 24 recorded. Area 201, the reproduction data area 23
This is an area in which directory entries managing the sectors in the area are recorded.

FIG. 2 shows a region 20 for simplicity of explanation.
Although 0 is assigned continuously from the top of the root directory area 22, the area 200 and the area 201 may be divided and assigned separately in the root directory area 22. In order to determine whether the directory entry belongs to the area 200 or the area 201,
An attribute indicating which sector of the reproduction area 23 or the recording / reproduction area 24 is managed may be described in the directory entry.

The sector in the recording / reproducing area 6 may be a sector that can be recorded only once in the same sector or a rewritable sector.

Next, an information recording method for creating a file on the information recording medium having the data structure described in FIG. 1 will be described.

FIG. 4 is an embodiment of the internal configuration diagram of the area 100 defined in the information recording medium of FIG. In FIG. 4, an area 100 is a data entity (RD) of n files.
, RD2,..., RDn), and shows a case where a plurality of subdirectories do not exist for simplification of description.

FIG. 5 shows a configuration diagram of a computer system. In FIG. 5, reference numeral 50 denotes an information recording medium from which data can be recorded, stored, reproduced, and retrieved;
Reference numeral 51 denotes an information recording / reproducing device that records and reproduces data on the information recording medium 50, and reference numeral 52 denotes a host computer that sends a command to the information recording / reproducing device 51 and requests data recording / reproducing on the information recording medium 50.

An embodiment of an information recording method when the computer system of FIG. 5 creates a file on the information recording medium described in FIGS. 1 and 4 will be described with reference to the flowchart of FIG. (Step A) The host computer 52 determines that the area 10
The data recording / reproducing device 51 sends a data reproducing command in which the starting sector address of 0 and the total number of sectors of the data entities (RD1, RD2,..., RDn) of the recorded n files are set. The information recording / reproducing apparatus 51 reproduces data from the first sector of the area 100 of the information recording medium 50 and transfers the data to the host computer 52. (Step B) The host computer 52 receives the data entities (RD1, RD2,...) Of the received n files.
, RDn). (Step C) The host computer 52 creates a directory entry in which the head sector address and size of the data entity of the selected file are set. Then, the host computer 52 sends to the information recording / reproducing device 51 the created directory entry, a data recording command in which the start sector address of the recording / reproducing data area 14 and the number of sectors required for recording the directory entry are set. The information recording / reproducing device 51 includes an information recording medium 50
The directory entry received from the host computer 52 from the first sector of the recording / reproducing data area 14 is recorded as a subdirectory.

A sector in the recording / reproducing data area 14 for recording a directory entry is a root directory in the root directory area 12 or an area 101.
It is managed by the directory entry recorded in the subdirectory inside.

Also, in the present embodiment, a case has been described where only a collection of data entities of a plurality of files is recorded in the area 100. However, even if a collection of a plurality of subdirectories is recorded, Further, even if both a plurality of data entities of a plurality of files and a plurality of subdirectories are present, it is easily realized.

As described above, according to the information recording method of the present embodiment, the host computer 52 merely finds a sector in which data is recorded by reading a directory by traversing a subdirectory from a root directory by writing a directory entry. A new readable file can be created by the DOS file reading procedure.

Next, an information recording method for creating a file on the information recording medium having the data structure described in FIG. 2 will be described.

FIG. 7 shows an embodiment of the internal configuration of the area 200 and the recording / reproducing data area 24 defined in the information recording medium of FIG. FIG. 7A is a diagram showing the internal configuration of the area 200, where m directory entries (RE1, RE2,.
., REm). FIG. 2B is an internal configuration diagram of the recording / reproducing data area 24, which is composed of m areas (WD1, WD2,..., WDm) for recording a file data entity or a subdirectory. Then, each directory entry REi (i = 1,
,... M) are regions WDi (i = 1, 2,.
・, M).

An embodiment of an information recording method when the computer system of FIG. 5 creates a file on the information recording medium described in FIGS. 2 and 7 will be described with reference to the flowchart of FIG. (Step D) The host computer 52 determines that the area 20
A data reproduction command in which a start sector address of 0 and the number of sectors are set is transmitted to the information recording / reproducing device 51. The information recording / reproducing device 51 reproduces data from the head sector of the area 200 of the information recording medium 50 and transfers m directory entries (RE1, RE2,..., REm) to the host computer 52. (Step E) The host computer 52 writes the area WDi (i = 1, i = 1, 2) of the recording / reproducing data area 24 managed by the directory entry REi (i = 1, 2,..., M).
2. Create a data entity or subdirectory of the file to be recorded in (m). Then, the host computer 52 sets the data entity or subdirectory of the created file, the sector address in the recording / reproduction data area 24 set in the directory entry REi, and the data in which the number of sectors corresponding to the set size is set. The recording command is sent to the information recording / reproducing device 51.
The information recording / reproducing apparatus 51 stores the host computer 5 in an area WDi in the recording / reproducing data area 24 of the information recording medium 50.
Record the data entity or subdirectory of the file received from 2. (Step F) The host computer 52 sets the area WDi in the recording / reproduction data area 24 managed by all the directory entries REi (i = 1, 2,..., M).
The operation of (Step E) is repeated until the data entity or subdirectory of the file is recorded at (i = 1, 2,..., M).

In this embodiment, the case where the area 200 is continuously allocated from the head of the root directory area 22 has been described. However, the area 200 and the area 201 are respectively divided and separated into the root directory area 22. It is easily realized even if it is assigned. At this time, an attribute indicating which sector of the reproduction area 23 or the recording / reproduction area 24 is managed is described in the directory entry. When this attribute is used, each directory entry is assigned to either the area 200 or the area 201. You can easily determine whether they belong.

As described above, according to the information recording method of this embodiment, the host computer 52 finds a sector in which data is recorded by crossing a subdirectory from the root directory only by writing the data entity or directory of the file. A new file or directory that can be read by the file reading procedure of the MD-DOS to be read can be created.

[0035]

As described above, according to the present invention,
After the information recording medium is manufactured, creation of an information recording medium capable of creating a new file by recording only one of a data entity of a file, a directory, and a directory entry for managing the data in a recordable area Then, a file can be created on the information recording medium. Therefore, it is possible to create an information recording medium capable of reducing the amount of data to be recorded in a recordable area when creating a file after the information recording medium is manufactured, and it is also possible to create a data entity or a directory of a file whose directory entry position is fixed. An information recording medium that can be changed after the information recording medium is manufactured can be created, and its practical effect is great.

[Brief description of the drawings]

FIG. 1 is an area configuration diagram in a first embodiment of an information recording medium of the present invention.

FIG. 2 is an area configuration diagram in a second embodiment of the information recording medium of the present invention.

FIG. 3 is a flowchart for explaining an embodiment of the information recording method of the present invention performed on the information recording medium of the first embodiment.

FIG. 4 is an internal configuration diagram of an area 100 in the information recording medium of the first embodiment.

FIG. 5 is a configuration diagram of a computer system used for the information recording method of the present invention.

FIG. 6 is a flowchart for explaining an embodiment of the information recording method of the present invention performed on the information recording medium of the second embodiment.

FIG. 7A is an internal configuration diagram of an area 100 in an information recording medium of a second embodiment, and FIG. 7B is an internal configuration diagram of a recording / reproducing data area 24 in the information recording medium of the second embodiment. It is.

FIG. 8 is an area configuration diagram of a conventional information recording medium.

[Explanation of symbols]

Reference Signs List 1 playback-only area 2 recording / playback area 5 playback-only area 6 recording / playback area 13 playback data area 14 recording / playback data area 22 root directory area 24 recording / playback data area 100 Data entity or sub of file in which directory entry to be managed is not recorded Area in which directory is recorded 200 Area in which directory entry indicating sector in recording / reproducing data area is recorded

──────────────────────────────────────────────────の Continued on the front page (72) Inventor Yuji Takagi 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-62-191942 (JP, A) JP-A-62-191943 (JP, A) JP-A-63-129558 (JP, A) JP-A-1-236488 (JP, A) JP-A-2-77830 (JP, A) JP-A-2-214924 (JP, A) JP-A-3-86975 (JP, A) JP-A-3-97046 (JP, A) (58) (Int.Cl. ⁷ , DB name) G06F 12/00 541 G06F 3/06 301 G11B 7/00 G11B 20/12 G11B 27/00

Claims (3)

(57) [Claims] 1. A recording / reproducing area in which data can be written and read, and a recorded / read area in which only recorded data can be read.
A read-only area. The read-only area has a directory
A collection of data entities from multiple files without birds
If the data or directory entries it manages are
There is no data, which is a collection of multiple directories,
An information recording method for recording data on information recording medium, the directory where the data entity of the plurality of files is no directory entry is managed, or to manage
Recognizing the plurality of directories without a trie entry; and selecting a data entity or a directory of one file from the recognized data entities of the plurality of files or the plurality of directories; Writing a data entity of one selected file or a directory entry for managing the directory to the recording / reproducing area. 2. A recording / reproducing area in which data can be written and read, and only a recorded data can be read.
A read-only area that manages the recording / playback area.
That a directory entry data, an information recording method for recording data to the recording information recording medium, the reproduction-only area that manages the recording and reproduction area
Information recording method characterized by performing the step of writing the step recognizing the directory entry, the data entity or directory of files in the recording and reproduction area of the directory entry recognized are managed. 3. By retrieving the directory entry attributes indicating that manages the sector of the recording and reproduction area are described, the recording and reproduction area said directory entry read only area which manages the sector 3. The information recording method according to claim 2 , wherein the information is extracted from the information.