JPH0777072B2 - Information recording / reproducing device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / reproducing device used for secondary storage of a computer device.

2. Description of the Related Art Conventional information recording / reproducing devices include those that use an information recording medium such as a magnetic tape, a magnetic disk, a magnetic drum, and an optical disk. Basically, the entire recording area on the information recording medium is a writable area. Alternatively, it was used as a reproduction-only area. The method of recording and using the information whose contents are previously determined by using these information recording / reproducing apparatuses is as follows: (1) Information recording / reproducing apparatus using an information recording medium whose entire recording area is a reproduction-only area In this case, the information is physically recorded collectively when the information recording medium is created.

(2) In the case of an information recording / reproducing apparatus using an information recording medium in which the entire recording area is a writable area, information is sequentially recorded electrically after the information recording medium is generated.

It was done by either method.

Problems to be Solved by the Invention However, by using an information recording medium which is entirely composed of recording areas of uniform characteristics, large-capacity information (data) such as a dictionary, character fonts, or system programs is used.
When the above is recorded on an information recording medium in advance and it is intended to be provided as a product, the following problems are raised.

(1) When an information recording medium composed of a read-only area in which all recording areas are physically recorded together is used, the information recording time at the time of product provision is constant regardless of the amount of information. However, the entire information recording medium becomes unrewritable, and it becomes impossible for the user to add information as well as to cope with correction when the data provided is incomplete.

(2) When using an information recording medium composed of a writable area in which all the recording areas can electrically record information, when there is a deficiency in the data added or provided by the user Corrective measures can be taken, but the information recording time at the time of product provision depends on the amount of information to be provided, and if a large amount of information is recorded and a large amount of information recording medium is supplied, It will take a very long time to be provided.

In view of such a point, the present invention uses an optical disc having a read-only area in which information can be physically recorded in advance and a writable area in which information can be written later in the same information recording medium, and a read-only area when a product is provided. It is an object of the present invention to provide an information recording / reproducing apparatus capable of physically recording and providing information to a writable area, and allowing a user to add information to a writable area or correct a data deficiency at the time of use. .

Means for Solving the Problems The present invention relates to an information recording medium, a writable area in which information can be electrically written when used, and a read-only area in which information is physically recorded when the information recording medium is generated. Writable area for information recording medium having file control information for managing the recording area in which files are stored in each area and volume management information for managing the directory and the writable area. An information recording means for writing information to, a information reproducing means for reading information from a read-only area and a writable area, and a file for reading information using a directory and file control information are stored. Search for the recording area, instruct the information reproducing means to reproduce the recording area, and add or Search for the recording area in which the file to be modified is stored and write the added or modified file. If the recording area in which the file was stored is a writable area, write it in that recording area In this case, a new writable recording area is searched for by using the volume management information, the information recording means is instructed to write in the recording area, and the updated directory and file control information and volume management information are rewritten. The information recording / reproducing apparatus is provided with the information control means for instructing the information recording means.

Effect The present invention has the above-mentioned configuration, and can record information in a read-only area physically at the time of generation, and an information recording medium in which information can be electrically written in a writable area.
When a large amount of information is recorded and provided as a file in the read-only area and a read request for the file is issued, the information control means uses the directory and file control information to write the read-out area of the recording area. The address is read by designating the address as the information reproducing means.
Also, when a request to add or modify a file is issued,
The information control means searches for a recording area in which a file for which an addition or correction request has been made is stored, and determines whether the recording area is read-only or writable. The information recording means is instructed to write, the writable empty recording area is searched by the volume management information in the reproduction-only area, and the information recording means is instructed to write the addition or correction information to the recording area.

Embodiment FIG. 1 is a block diagram of an information recording / reproducing apparatus according to an embodiment of the present invention. In FIG. 1, 1 is an information recording medium having a read-only recording area in which information is physically recorded at the time of generation and a writable recording area in which information can be recorded later, and 2 is on the information recording medium 1. Information reproducing means for reading information from the reproduction-only recording area and writable recording area, 3 is information recording means for writing information in the writable recording area on the information recording medium 1, and 4 is an information recording medium. It is an information control means for designating a recording area to be read from and written to the information reproducing means 2 and the information recording means 3 by using the directory, file control information and volume management information on 1.

The information recording medium 1 is uniformly divided into blocks of a certain size as a recording area as shown in FIG. 2, and each block is provided with a physical address (block number) in the information recording medium. Writing and reading of information are performed in this block unit. The block stores a file entity, a block in which volume management information for managing a free recording area of a writable area is stored, and file control information as shown in FIGS. 4 and 5. There is a block in which the directory block and the file control block are written.

The file recorded on the information recording medium 1 is UNIX or MS-
Consider managing in a directory with a well-known hierarchical structure in DOS. At this time, the root directory of the hierarchy is called a root directory, and since the directory itself has a variable size, it is managed in the same format as files.

In FIG. 5, 30 _i is a file control block, 31 is a block determination flag, and 32 is a block address. The file control block 30 _i is a block in which file control information is written, and is a block address indicating which physical block the file is composed of.
32 and a block determination flag 31 indicating whether the block is writable or read-only. The value F of the block determination flag 31 represents information such as 0: “reproduction-only block” and 1: “writable block”.

In FIG. 4, 20 _i is a directory block, 21 _i is a directory, 22 is a file control block number, 23 is a file control block determination flag, and 24 is a file name (or directory name). Directory block
20 _i is a directory including a file name (directory name) 24, a file control block number 22 for accessing the corresponding file control block 30 _i , and a file control block determination flag 23 for determining whether the file control block is writable It is a group of 21 _i .
As with the block determination flag 31, the value F of the file control block determination flag 23 is 0: “reproduction-only block”, 1:
It represents information called "writable block".

In the initial state, as shown in FIG. 3, the directory block 20 _i and the file control block 30 _i indicating the control information of the substance of the file written in the read-only area 10 of the information recording medium 1 are on the read-only area 10. the information file entity when generating the recording medium 1 and are recorded simultaneously and collectively, the writable area 11 on the volume management information reserved block as an area to be written in the volume management information 12 and the root directory block 20 ₁ root directory book block 20 ₂ is secured with.

When a file is modified or added, the modified file is written to the writable area 11 if the file is in the playback-only area 10, and the modified file is recorded in the recording area if the file is in the writable area 11. Write. Also, the directory that manages the file 21
If the changed part of _i and the file control block 30 _i is not rewritten in the writable area 11, the changed content is transferred to the writable area 11. At this time, the directory 21 _i and the file control block 30 _i before the change are left in the reproduction-only area 10, but when the information reproduction means 4 makes a file operation request, first, the root directory block 20 of the writable area 11 is written. ₂ were examined, (if present) is not if can be read going to read the root directory block 20 _first read only area 10.

The operation of the information recording / reproducing apparatus of this embodiment configured as described above will be described below.

FIG. 6 and FIG. 7 are flowcharts for explaining the operation of the information control means 4 when reading a file, modifying a file, or adding a file.

(A) When requesting to read information from the target file: (R10) Start file read operation.

(R11) Root directory of writable area 11
Go to read the block 20 ₂ using the information reproducing unit 2.

(R12) Writable area 11 root directory
Fly to if block 20 ₂ has been read (R14).

(R13) read the root directory block 20 ₁ of the read-only area 10 by using the information reproducing means.

(R14) The directory block 20 _i and the file control block 30 _i are used to hierarchically search the directory to obtain the file control block 30 _i indicating the target file.

(R15) The block address 32 of the target file control block 30 _i is read using the information reproducing means 2.

(R16) The information reproducing means 2 is instructed to read the stored block of the file.

(R17) File read operation is completed.

(B) When requesting correction or addition of information to the target file: (W10) Start correction or addition operation of the file.

(W11) Writable area 11 root directory
Go to read the block 20 ₂ using the information reproducing unit 2.

(W12) Writable area 11 root directory
Fly to if block 20 ₂ has been read (W14).

(W13) read the root directory block 20 ₁ of the read-only area 10 by using the information reproducing means.

(W14) A directory is hierarchically searched using the directory block 20 _i and the file control block 30 _i to obtain a file control block 30 _k indicating the target file.

(W15) The block address 32 of the target file control block 30 _k is read using the information reproducing means 2.

(W16) The block determination flag 31 of the block to be corrected or added is read.

(W17) If F = 1, jump to (W19).

(W18) When the root directory block is read from the read-only area, a free block in the writable area 11 is searched for by the volume management information 12, and when read from the writable area, the writable area 11 is written by the volume management information reserved block. Find a free block in.

(W19) Write the information to be modified or added to the specified block.

(W20) The file control block determination flag 23 of the directory 21 _k indicating the modified or added file control block 30 _k is read.

(W21) If F = 1, jump to (W23).

(W22) When the root directory block is read from the read-only area, a free block in the writable area 11 is searched for by the volume management information 12, and when read from the writable area, the writable area 11 is written by the volume management information reserved block. Find a free block in.

(W23) directory block that contains the directory 21 _k
20 _k and file control block 30 _k are modified (change of block address 32 and values of file control block determination flag 23 and block determination flag 31 are set to F = 1), and updated when block address 32 is changed The created volume management information is written in the volume management information reservation block.

(W24) File modification or addition operation ends.

In this embodiment, the directory and file control information are mixed in the writable area and the read-only area, but if the directory and file control information are present only in the writable area, the directory block and the file control block are rewritten. Sometimes, it is not necessary to determine whether the recording area is read-only or writable.

Further, in the present embodiment, the directory block and the file control block are divided and recorded in separate blocks, but by managing them collectively on the same block, the file control block discrimination flag and the file control block number Can be omitted.

EFFECTS OF THE INVENTION As described above, according to the present invention, by using an optical disc having both a read-only area and a writable area on the same information recording medium, it is predetermined when a product is provided, that is, when the information recording medium is created. By collectively recording the information of the contents, it is possible to inexpensively mass-produce the information recording medium having the large-capacity read-only recording area. It is possible to provide an information recording / reproducing apparatus which can be performed, and its practical effect is great. Also, since the information in the initial state written and provided in the read-only area is not erased, it is easy to use the information written in the writable area even if additions or corrections have been made. It is also possible to restore the information in the initial state.

[Brief description of drawings]

FIG. 1 is a block diagram of an information recording / reproducing apparatus of an embodiment of the present invention, FIG. 2 is an explanatory diagram showing blocking of an information recording area, and FIG. 3 is an explanatory diagram showing an initial state of an information recording medium 1. FIG. 4 is an explanatory diagram of a directory block, FIG. 5 is an explanatory diagram of a file control block diagram, and FIGS. 6 and 7 are flowcharts for explaining the operation of the information control means 4. 1 ... Information recording medium, 2 ... Information reproducing means, 3 ... Information recording means, 4 ... Information control means, 10 ... Reproduction-only area,
11 …… Writable area, 12 …… Volume management information,
20 _i ...... Directory block, 21 _i ...... Directory, 22 ...... File control block number, 23 ...... File control block identification flag, 24 ...... File name, 30 _i ......
File control block, 31 ... Block judgment flag, 32
...... Block address.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiyuki Iwamura 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Takashi Ishida, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A file is stored in a recording area generated in an information recording medium, which has a writable area and a read-only area in which information can be collectively recorded when a recording area such as a track or a sector is generated. To access the file control information, which has an address portion indicating the address of the recording area and a flag portion indicating whether the recording area is created in the read-only area or the writable area, and the file control information. A directory having a pointer and a file name, an information recording section in which a file is actually stored, and volume management information for managing a free recording area of the writable area are stored, respectively, on the information recording medium. Information reproducing means for reading information from the reproduction-only area and the writable area, and the writable area To the information recording means for writing information to the information recording means, and to the information reproducing means, addressing of the recording area in which the file to be reproduced is stored is performed by the directory and the file control information. On the other hand, when the address of the recording area in which the file to be added or modified by the directory and the file control information is stored is specified and the flag portion of the file control information indicates the writable area, Instruct to write in the recording area, and when the flag part of the file control indicates a read-only area, instruct to write in an empty recording area addressed by the volume management information. Along with the change in the address of the recording area, Directory, the information recording and reproducing apparatus characterized by comprising an instruction to the information control unit to perform rewriting of the file control information and the volume management information.