JP2001052465A - Information recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and efficiently manages the state where file data are recorded in a recording area by providing a counter array, which matches a recording unit array divided into minimum units of recording, in the recording area wherein the file data and a file recording management table are recorded. SOLUTION: A user data area has its recording state managed by sectors which are recording units of a disk or units (block) 311 which are an integral multiple of the sectors. One counter 321 is provided for each block 311 and a counter array constituted matching an array of blocks 311 is prepared as a recording state counter table 320. All the counters 320 are initially set to 0 and each time file data are newly recorded or a file is composed of part of file data which are already recorded, 1 is added to the counter corresponding to the block 311 where respective file data are recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a file recording format of an optical disk or a magnetic disk, and in particular, when a plurality of files share and manage the same file data, the file data is recorded or unrecorded. This is related to a file recording format that manages whether or not.

[0002]

2. Description of the Related Art Conventionally, regarding the file recording format, ECMA Volume and File Structure for Write-Onc
e and Rewritable Media using Non-Sequential Record
ing for Information Interchange Part 4 File struc
ture. According to the specifications, for file data record management, data size,
In addition, the recording start address is held, and as for the data recording range of each file, it is possible to hold the same area of the recording area, and a plurality of files share the same file data. Is possible.

On the other hand, whether or not file data is recorded in a recording area or not recorded is managed by a bit map table. Then, the data is divided into recording units for the disk, and the recording unit is divided into one bitmap table.
Bits are made to correspond to each other, and it is possible to determine whether file data is recorded or not recorded in a recording unit corresponding to the bit by judging 0 or 1 of the bit.

[0004]

In the file recording format described above, for example, when a file is to be deleted in a state where the same file data is shared by a plurality of files, the file data is recorded. Area is unrecorded by deletion, or
Since there is a shared file, to determine whether the file data is still recorded even when the file is deleted, the entire file data recording range of the file recorded on the disc must be determined. reading,
It is necessary to determine whether or not the file data recording range of all the files to be deleted overlaps with the file data recording range of the file to be deleted.

The present invention has been made in order to solve the complexity of such a conventional determination method. When file data is shared by a plurality of files or when a file is deleted, the file data is stored in a recording area. It is an object of the present invention to provide an information recording medium having a file recording format in which a recorded state can be managed simply and efficiently.

[0006]

In order to achieve the above object, the configuration of a file recording format according to the present invention is as follows.
File data, and a file recording management table for holding the data size and recording start position of the file data, and further, for the recording area for recording the file data and the file recording management table, It is characterized by having a counter row that matches a recording unit row that can be divided in units.

Each of the counters in the above counter column is set to 0 when file data is not recorded in the corresponding recording unit column, and when file data is recorded, the counter of the file data is configured. It is a counter that sets a value that matches the number of files used as data.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A file recording format according to an embodiment of the present invention will be described below.

In the present embodiment, a file recording format on an optical disk or a magnetic disk as a representative example will be described with reference to FIGS.

FIG. 1 is an explanatory view of a recording space of a disc in a file recording format according to the present embodiment.
FIG. 3 is an explanatory diagram of a file management structure in the disk space of FIG. 1, and FIG. 3 is an explanatory diagram of a recording state counter table for managing a recording state of a file in the disk space of FIG.

In FIG. 1, reference numerals 101 and 103
Is an area for recording information necessary for a drive device for recording and reproduction to control the disk, and information necessary for a system controlling the drive device to manage the disk. Reference numeral 102 denotes a user data area for recording file data and recording management information of the file data. The user data area includes a file recording management table described in FIG. 2, a file data, and a recording state counter table described in FIG.
In addition, information for managing files in a hierarchical directory structure is recorded in 102. The information is recorded in the ECMA Volume and File Structure for WMA.
rite-Once and Rewritable Media using Non-Sequentia
l Recording for Information Interchange Part 4 Fil
e is the management information described in the structure, etc., and in the present invention,
No particular mention.

Next, a file recording management structure for recording in the user data area 102 will be described with reference to the example of FIG. FIG.
Shows a recording management structure when two files, File A and File B, are recorded. Reference numerals 201 and 202 denote file record management tables for recording the record ranges of the data of the file A and the file B, respectively, and record the record size 211 and the record address 212 as one record. For example, when the data of the file is recorded in one continuous area as in the file A, the record is a file record management table (201) composed of one record. When the recording range is distributed and recorded in a plurality of areas, a file recording management table (202) in which the record is recorded for the area is provided.

Reference numeral 220 denotes a file A and a file B
221 indicates file data of file A, which is recorded from the file recording management table 201 at [recording size 211 (Sa1), recording address 212 (Pa1)]. Become. On the other hand, 231, 232, 233, and 234 are file data of the file B, and are stored in the file record management table 20.
2, [recording size 211 (Sb1), recording address 212 (Pb1)], [recording size 211 (Sb2),
Recording address 212 (Pb2)], [recording size 211
(Sb3), Recording Address 212 (Pb3)], [Recording Size 211 (Sb4), Recording Address 212 (Pb3)]
4)], the recording is performed in a dispersed manner.

As shown in FIG. 1, the file record management tables for each file are independent of each other.
Since the recording size 211 and the recording address 212 are recorded, a part of the file data of the file A can be shared as the file data of the file B as shown by 220. That is, when a file B is configured from a part of the file data 221 of the file A, the corresponding file data (231, 232, 23
3, 234) and need not be newly recorded as file data of the file B in an unrecorded user area.

On the other hand, regarding the user data area 102,
FIG. 3 shows the file management table and the recording state counter table for managing the recording state of file data and the like.
This will be described with reference to FIG.

In the user data area, the recording state is managed in units of sectors, which are recording units of the disk, or in units (hereinafter, referred to as blocks) 311 which are integral multiples of sectors. That is, one counter 321 is provided for each block 311, and a counter row configured in line with the block 311 is prepared as the recording state counter table 320. When a state in which nothing is recorded is set as an initial state, all the counters 321 are set to 0, and each time file data is newly recorded or a file is constructed from a part of recorded file data, Is added to the counter corresponding to the block 311 in which is recorded.

For example, in the example of FIG. 2, when the file A is recorded and the file B is composed of a part of the file data 221 of the file A, first, it corresponds to the block 311 in which the file data 221 of the file A is recorded. All counters 321 in the recording state counter table 320 are set to 1
At the time point when the file B is composed, the counter 321 of the recording state counter table 320 corresponding to the block 311 of the file data 231, 232, 233, and 234 of the file B is all incremented by one.

On the other hand, when deleting a file, the counter corresponding to the block 311 in which the target file data is recorded is decremented by one.

By managing the recording state of the user data area in this way, the block 311 in which the value of the counter 321 of the recording state counter table 320 is 0 is not shared with the already recorded file data, The block 311 in which file data can be newly recorded, and the block 311 in which the value of the counter 321 of the recording state counter table 320 is 1 or more are shared as file data of a file that matches the value of the counter 321. It is possible to determine that the block 311 has been recorded.

As described above, in addition to the file data, the user data area 102 also records a file record management table, information for managing files in a hierarchical directory structure, and the like. It goes without saying that the counter 321 corresponding to the block 311 to be recorded is also in the state of 1.

According to the above-described embodiment, in a file recording format in which file data can be shared, generation of a file accompanying recording of file data, generation of a file by sharing file data, and deletion of a file are performed by a user. The state of recording in the data area can be managed by adding / subtracting a counter, and it is possible to determine whether file data is recorded or not recorded by determining the counter value.

[0022]

As described above, according to the file recording format of the present invention, when file data is shared by a plurality of files or when files are deleted, the file data is recorded in the recording area. It is possible to provide a file recording format in which state management can be performed simply and efficiently.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a recording space of a disc in a file recording format according to an embodiment.

FIG. 2 is an explanatory diagram of a file management structure in the disk space of FIG. 1;

FIG. 3 is an explanatory diagram of a recording state counter table for managing a recording state of a file in the disk space of FIG. 1;

[Explanation of symbols]

102: User data area, 211, 212: File record management table, 211: Record size, 212: Record address, 221, 231, 232, 233, 234 ...
File data, 311 blocks, 320 recording state counter table, 321 counter.

Claims (2)

[Claims] A file recording management table for holding a data size and a recording start position of the file data;
An information recording medium characterized by having a file recording format having a counter sequence corresponding to a recording unit sequence formed by dividing a recording area for recording the file recording management table into minimum units for recording. 2. Each of the counters in the counter row is set to 0 when file data has not been recorded in the corresponding recording unit row.
Is set, and when file data is recorded, the information has a file recording format which is a counter such that a value corresponding to the number of files having the file data as configuration data is set. recoding media.