JPH04182970A - Data storage system - Google Patents

Abstract

PURPOSE:To improve utilization efficiency in the user's recording region by providing a data storage region to record filing data and an index storage region to record filing management information in the user's recording region. CONSTITUTION:In the user's recording region 12, the data storage region 21 where the filing data is recorded and the index storage region 22 where the filing management information is recorded are provided. In the data storage region 21, the filing data is recorded by the order of registration from the top position in the data storage region 21 regardless of the partition of regions to be registered. Also, in the index storage region 22, an identifying code indicating the partition where the filing data is recorded is attached, and the filing management information, which is made corresponding to the specific filing data on one to one basis, is recorded by the order of registration from the top position in the index storage region 22. Thus, depending on the frequency of the data processing of each partition, the recording capacity of each partition may be adequately controlled; and consequently, the waste of the user's recording region is reduced, and the utilization efficiency in the user's recording region is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data storage method for a write-once information recording medium, such as a write-once optical disc, in which information cannot be rewritten.

[Prior Art] In recent years, large-capacity optical disk file systems that record image data such as documents using large-capacity optical disks have been attracting attention as a new document management means.

In such a file system, in order to make it convenient to use, the user recording area (an area in which the user can add their own data) of a large-capacity optical disk is divided into multiple partitions, and each partition is an entity of image data. File data and the file name of the file data,
A data storage method is often used in which file management information consisting of a data recording start address, data size, type, etc. is recorded.

Further, as the optical disc, a so-called write-once type optical disc on which data can be recorded only once is often used.

[Problems to be Solved by the Invention] Since data cannot be erased or rewritten on write-once optical discs, files are stored in the user recording area each time file data is registered, or updated or deleted. As data and file management information are added, the user recording area becomes narrower.

For this reason, when using a data storage method such as dividing the user recording area into multiple partitions and recording file data and file management information in each partition as described above, the partitions where data processing is frequently performed are Partitions with insufficient data recording capacity and infrequent data processing tend to have excess data recording capacity, resulting in inefficient use of the user recording area.

The present invention was made in order to solve the above-described drawbacks of the prior art, and provides a data storage method that uses optical disks with high efficiency without impairing the advantages of dividing the user area into a plurality of partitions. The purpose is to

[Means for Solving the Problems] In order to achieve the above object, the present invention divides a user recording area of an information recording medium into a plurality of partitions (in two), and stores file data and one partition in each partition.
In the data storage method for recording file management information corresponding to pair 1, the user recording area is provided with a data storage area for recording the file data and an index storage area for recording the file management information, and the file management information is recorded in the index storage area with an identification code representing the partition to which the file data is recorded in one-to-one correspondence, and the file data is stored in the data storage area regardless of the partition to which the file data is recorded. The configuration is such that records are recorded in the order of registration starting from the first position.

[Effect Cofile data regardless of the partition to which it is recorded]
If you record in the order of registration from the beginning of the data storage area, you can increase or decrease the recording capacity of each partition as appropriate depending on the data processing frequency of each partition. A situation in which data recording capacity is left over for a partition whose data processing frequency is low does not occur. Therefore, the waste of user recording area is reduced and usage efficiency is improved.

Furthermore, since the file management information includes an identification code representing the partition where the file data is recorded, the file data can be managed for each partition. Therefore, even when a large-capacity optical disk is used as a file memory, effects such as rapid data processing can be achieved.

"Example code" An embodiment of the present invention will be described below with reference to the drawings.

Fig. 1 is an explanatory diagram schematically showing the recording area on a write-once optical disc, Fig. 2 is an explanatory diagram schematically showing the data structure of file management information recorded in the index storage area, and Fig. 3 is an explanatory diagram schematically showing the data structure of file management information recorded in the index storage area. FIG. 6 is an overall configuration diagram of an optical disk file system that implements the data storage method of the invention. As shown in FIG.
CPt,+ (central processing unit) that controls the entire system
1, an optical disk file 2 for registering file data and file management information, a control program for operating the CP Ij 1, a memory 3 for storing variables, tables, etc. used by the CPUI, and various terminal devices. It consists of 4 to 7. The terminal devices include a scanner 4 that imports file data to be registered in the optical disk file 2, a display 5 that displays file data and menus from CPtJl, a keyboard 6 that inputs commands, etc. A magnetic disk drive 7 storing system files is provided.

The CPUI transfers the file data captured by the scanner 4 to the optical disk file (optical disk recording/reproducing device) 2 according to the control program stored in the memory 3. The optical disk file 2 records file data and file management information including the file name, data recording start address, data size, type, etc. of the file data on a write-once optical disk that is an information recording medium.

As shown in FIG. 1, the write-once optical disc 10 records the volume name of the optical disc, the date of first use, etc.
A system area 11 used exclusively by the system side and a user recording area 12 used by the user to record data are provided. The user recording area 12 includes a data storage area 21 where file data is recorded, and a An index storage area 22 in which management information is recorded is provided.

File data is recorded in the data storage area 21 in the order of registration, starting from the beginning of the data storage area 21, regardless of the partition to which it is recorded.

Furthermore, the index storage area 22 is provided with an identification code representing the partition where the file data is recorded, and file management information in one-to-one correspondence with specific file data is placed at the beginning position of the index storage area 22. They are recorded in the order of registration.

In FIG. 1, three file data FI) 1 to FD3 are sequentially recorded in the data storage area 21, and correspondingly, three file management information DI are recorded in the index storage area 22.
A state is illustrated in which RI to DIR3 are sequentially recorded, and the remaining portion 23 of the data storage area 21 and the remaining portion 24 of the index storage area 22 are unrecorded areas.

Note that in an information recording medium such as an optical disk, the recording area is divided into a number of sectors, and each sector is assigned a unique sector number, and the system of this embodiment also uses only this sector number. It is said that the input/output address of data can be specified.

FIG. 2 is an explanatory diagram showing the configuration of file management information, which includes an identifier 31, an absolute number 32, a type flag 33, a file flag 34, a partition number 35,
File name 36, extension 37, creation date 38,
File ID 39, parent ID 40, data address 4
1, a data size 42, and a reserved area 43.

The identifier 31 is a mark attached to a file directory to distinguish it from file data, and is an absolute number 32.
is a serial number that increases by one each time file management information is recorded on the write-once optical disc.

The type flag 33 indicates the type of processing performed on the file data managed by this file management information (hereinafter referred to as "applicable file data J"). For processing, please refer to “U
', "E" is recorded for deletion processing.

The file flag 34 indicates the type of file data, and "D'" is recorded for the directory, and "F" is recorded for the file data.

The partition number 35 indicates in which partition the corresponding file data is recorded, the file name 36 and extension 37 indicate the file name of the corresponding file data, and the creation date 38 indicates the file name of the corresponding file data. The file ID 39 indicates the creation date, and the file ID 39 indicates the unique number of the file data to be recorded in the partition where the file data is recorded.

The parent ID 40 indicates where the corresponding file data is located in the directory structure, and is, for example, the parent ID
40 is “6”, file ID 39 is “6”.
'' (see Figures 4 and 5).

The data address 41 indicates the recording position of the corresponding file data, and the recording start sector on the write-once optical disc 10 is displayed.

The data size 42 is the amount of data (
(number of bytes). If the file management information is a directory, there is no actual data, so the data address 41 and data size 42 are O (zero).

The reserved area 43 is an empty area provided in preparation for future expansion of file management information, and can be omitted.

Hereinafter, the procedure of file processing using a write-once optical disc in which file data and file management information are stored as described above will be explained with reference to FIGS. 4 and 5.

First, the system is started up and the system area 21 is read from the write-once optical disc 10 provided in the optical disc file 2. This makes it possible to know the number of partitions and recording capacity created in the shorthand optical disc 10.

Next, the index storage area 22 is read from the write-once optical disc 10.

Next, a desired partition number 35 is designated from among the file management information created for each l file, and a management table of file data belonging to the partition designated by the number 35 is created.

FIG. 4 is a table showing the main part of this management table (part of the file management information shown in FIG. 2), and shows that file data or directories are recorded, deleted, and updated a total of 13 times. It shows that

Finally, a management table representing only the latest processing is created from the file management information shown in FIG.

FIG. 5 is a table showing the main parts of this management table, and shows the names of files 13.1.1 that were deleted or updated after recording. ．． Regarding each data of 11 and ill, only the latest data is written to the management table, and the old data is ignored. File names that have not been deleted or updated and remain as recorded 14.1゜,i
II, d4, d.

Each piece of data is written as is to the management table.

The management tables shown in FIGS. 4 and 5 are created for each partition.

The user can manage the optical disk file 2 using the management table shown in FIG.

In the data storage method of the above embodiment, file data is recorded in the order of registration from the beginning of the data storage area 21 regardless of the partition to which it is recorded, so the recording capacity of each partition can be adjusted as appropriate depending on the data processing frequency of each partition. It can be increased or decreased. Therefore, there is no possibility that a partition that processes data frequently will run out of data storage capacity, or a partition that processes data less frequently will have excess data storage capacity.
Waste of user recording area is reduced and usage efficiency of user recording area is improved.

In addition, since the file management information includes an identification code that represents the partition where file data is recorded, file data can be managed for each partition, and even when a large-capacity optical disk is used as file memory. Capable of rapid data processing.

Note that the gist of the present invention lies in a data storage method for an information recording medium, and the system configuration and file management information configuration are not limited to those mentioned in the above embodiments. These can be appropriately designed as necessary.

Further, in the above embodiments, a write-once optical disk was used as the information recording medium, but the present invention can also be applied to a case where a write-once type information recording medium of various types such as an optical card is used.

[Effects of the Invention] As explained above, according to the present invention, file data is recorded in the order of registration from the beginning position of the data storage area regardless of the partition to which it is recorded, so that the data recording capacity is reduced for partitions where data processing is frequently performed. This eliminates the problem of running out of data or having excess data storage capacity on partitions that process data infrequently.
It is possible to improve the usage efficiency of the user recording area. In addition, since the file management information has an identification code that represents the partition where file data is recorded, file data can be managed for each partition, allowing rapid data processing for large-capacity information recording media. It can be carried out.

[Brief explanation of the drawing]

The figures are all for explaining one embodiment of the present invention, and Fig. 1 is an explanatory diagram schematically showing the recording area of a write-once optical disc, and Fig. 2 is an explanatory diagram schematically showing the recording area of a write-once optical disc, and Fig. 2 is a file management diagram recorded in the index storage area. An explanatory diagram schematically showing the data structure of information,
Fig. 3 is an overall configuration diagram of an optical disk file system that implements the data storage method of the present invention, Fig. 4 is a table showing an example of a management table for file data recorded in one partition, and Fig. 5 is a diagram showing an example of a management table for file data recorded in one partition. 5 is a table diagram showing an example of the latest management table created from the management table in FIG. 4. FIG. 10...Writable optical disc, 11...
System area, 12... User recording area, 21...
...Data storage area, 22...Index storage area, FDI to FD3...File data, D
IRI~DIR3...File management information, 31...
...Identifier, 32...Absolute number, 33...
...Type flag, 34-...File flag, 35-
...Partition number, 36...File name, 3
7...Extension, 38...Date of majority, 3
9... File rD, 40... Parent ID, 41...
...Data address, 42...Data size, 43...Reserved area. Figure 1 Prisoner of War or Reward 1 Figure 3 6 3 7 Z 4th
figure

Claims (2)

[Claims] (1) In a data storage method in which a user recording area of an information recording medium is divided into a plurality of partitions, and file data and file management information in one-to-one correspondence are recorded in each partition, in the user recording area, A data storage area for recording the file data and an index storage area for recording the file management information are provided, and the file management information includes:
The file data is recorded in the index storage area with an identification code representing the partition to which the file data is recorded in one-to-one correspondence, and the file data is stored at the beginning of the data storage area regardless of the partition to which the file data is recorded. A data storage method characterized by recording in the order of registration based on location. (2) The data storage method according to claim 1, wherein the beginning of the index storage area and the beginning of the data storage area are located at both ends of the user recording area.