JPH0279268A - Card type optical recording medium - Google Patents

Abstract

PURPOSE:To improve the processing efficiency of reading and writing by forming a number recording part to write a sequential number to a part of a block to constitute a data track and providing a starting number part and an end number part at a directory. CONSTITUTION:In a card type optical recording medium composed by making plural band-shaped areas provided at the data recording area of a card type substrate 1 into a data track 5, the data track 5 is divided into plural blocks and a number recording part to write the sequential number to identify respective blocks to a part of the block is formed. A starting number part to make a part of a data track 7 into a directory and write the sequential number of the block to be first read to the directory and an end number part to write the sequential number of the block to be finally read are provided. Thus, the writing of the sequential number to the directory and the data writing to the block can be simultaneously executed and the writing efficiency of data can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a card-type optical recording medium in which band-shaped data tracks are formed in a data recording area of a card-type substrate.

[Prior Art] In recent years, a card-type optical recording medium (optical memory card) in which a data track is a band-shaped area provided in a data recording area of a card-type substrate has been attracting attention.

By the way, in conventional optical memory cards, each data track in the data recording area is divided into multiple blocks, and when writing a file to a data track, the file is divided into blocks of each block size (recording section J1). It is divided and written sequentially in blocks.

Further, in such an optical memory card, some data tracks are used as a directory as shown in FIG. The directory includes a file entry 30 that records the name and attributes of the file to be written, and a file allocation table (hereinafter referred to as F) that records a sequential number to identify the block in which the file is written.
(referred to as AT) 40. This FAT40
has a structure in which a plurality of number recording sections 41 each having a length of several bytes are arranged in correspondence with blocks.

When writing file data in blocks, check whether the data has been written correctly. If the data has been written correctly, the number recording unit 41 corresponding to the block
writing sequential numbers on the data track, scratches on the data track,
If writing is not performed correctly due to dirt, etc., the same data is written to the next consecutive block, and the same consecutive number as the block in which the writing error occurred is written to the corresponding number recording section 41. At this time, the writing error is detected. Certain identification data (XX) indicating that reading of the block is invalidated is written in the number recording section 41 corresponding to the block where the block was found.

When reading file data, reading is performed block by block in the order of the sequential numbers in the number recording section 41 of the directory.

[Problems to be Solved by the Invention] In the conventional card-type optical recording medium described above, when writing file data, writing a sequential number to a directory and writing data to a block are performed separately, so it is difficult to write data efficiently. The disadvantage was that it decreased.

Furthermore, since the sequential numbers of blocks are written in the directory, there is a drawback that a large amount of area is used for the directory.

[Means for Solving the Problems] The present invention, which solves the above-mentioned conventional problems, provides a card-type optical recording medium whose data tracks are a plurality of strip-shaped areas provided in a data recording area of a card-type substrate. is divided into a plurality of blocks, a number recording unit is formed in a part of the block to write a sequential number for mutually identifying each block, and some of the data tracks are used as a directory, and the data is first read into the directory. The structure includes a start number section in which the sequential number of the block mentioned above is written, and an end number section in which the sequential number of the block to be read last is written.

[Embodiment 1] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIGS. 1 and 2 show a card-type optical recording medium according to an embodiment of the present invention.

In the card-type optical recording medium of this embodiment shown in FIG. 1, data tracks 5 are a plurality of strip-shaped areas provided in parallel at regular intervals in a data recording area 2 on a card-type substrate l.

In this embodiment, the data track 5 is divided into a file area 6 for recording files and a directory area 7 for forming directories. The data track 5 of the file area 6 is formed by dividing it into a plurality of blocks 1O of a constant length, as shown in FIG. Furthermore, a number recording section 11 is formed at the beginning of the block 10 to record a sequential number for mutually identifying the blocks 10. This number recording section 11 has a length of several bytes, 0 to 855, for example, if the length is 2 bytes.
Sequential numbers up to 35 can be recorded. Note that a track number is assigned to the data track 5 in advance, and when reading a file from the data track 5, the read head is accessed in the order of the track number.

The directory 15 formed in the data track 5 of the directory area 7 is a directory 1 as shown in FIG.
5 Directory number entry section 16 for writing own sequential number and file name entry section 1 for writing file name
7, a start number section 18 in which the sequential number of the block 10 to be read first is written, and an end number section 19 in which the sequential number of the block 10 to be read last is written. With such a directory 15, when reading a file, the reading start and reading blocks 1O can be immediately known, and reading can be performed efficiently.

Further, when the sequential number of block 10 is added to each file unit, the directory 15 is structured as shown in FIG. 4. Directory number entry section 16
, file name entry section 17, start number section 18. In addition to the end number section 19, a start track number section 20 contains the number of the data track 5 where the first block 10 is located.
An end track number section 21 is provided in which the number of the data track 5 in which the last block 10 is located is written. This allows you to quickly identify the read range of a file.

As described above, in this embodiment, the directory 15 does not record a sequential number for directly identifying the block IO, but only the start number section 18, end number section 19, etc. are provided, and the length of the directory area 7 can be reduced.

Next, a method of writing a file to the data track 5 shown in FIG. 2 will be explained.

When writing and checking a file for each block 1o, as shown in Figure 5, write the file data and sequential number in block 10, check the writing, and if normal, write the next sequential number in the next block 10. Write data. If a write error occurs, erase the data in the block IO and rewrite the same sequential number and data to the next block IO. This rewriting is repeated until the writing is done correctly9 In this way, the last data is written. In FIG. 1, the block 10 in which the writing error occurred is indicated by an X mark.

When writing a file for each of multiple blocks IO, for example, for each data track 5, sequential numbers and data are written to all blocks 10 of data track 5 in one write operation as shown in FIG. case,
A check is also performed for each data track 5, and the sequential number and data of block 10 where a write error has occurred are incorporated into block 10 of the next data track 5. If writing is performed for each of a plurality of blocks 1O in this way, the writing processing speed will be greatly improved.

Note that when writing sequential numbers across all blocks 10, use the directory 15 shown in FIG. 3, and when writing sequential numbers for each block 10 used for recording files, use the directory 15 shown in FIG. Use.

In addition to the number recording section 11, the data track 5 is provided with a file number section 25 in which a file number is written as shown in FIG. 7(A), and a file number section 26 in which a file number corresponding to the directory 15 is written. If this is provided, files can be quickly recognized during reading by comparing their file numbers. In this case, the structure of the directory 15 can be extremely simplified.

In addition, if an error occurs when writing the directory 15, the directory number entry section 1 of the next directory 15
It is only necessary to write the same sequential number to 6 and write the directory contents again, and it is easy to deal with write errors.

In the above embodiment, the blocks 10 extend continuously, but the blocks 10 may be separated by a gap of a predetermined length.

[Effects of the Invention] As explained above, according to the present invention, since the number recording section for writing sequential numbers is formed in a part of the blocks constituting the data track, file data can be written while writing sequential numbers in the directory. Since sequential numbers and file data can be written at the same time, writing speed is faster and writing errors can be easily handled, improving writing processing efficiency and reducing the amount of space used for directories. can.

Furthermore, since the directory has a start number section and an end number section, the reading range of the file can be quickly recognized and the reading process is improved.

Furthermore, by providing a number entry section for writing its own sequential number in the directory, it is possible to easily deal with directory writing errors.

[Brief explanation of the drawing]

FIG. 1 is an external view of a card-type optical recording medium according to an embodiment of the present invention, and FIG. 2 is an enlarged view of essential parts of a card-type optical recording medium according to an embodiment. Figures 3 and 4 are diagrams each showing the structure of a directory, Figures 5 and 6 are diagrams each showing a method of writing file data to a card-type optical recording medium, and Figures 7 (A) and CB).
8 is a diagram showing another example of a sector and another example of a directory, respectively. FIG. 8 is a diagram showing the structure of a directory of a conventional optical recording medium. 1: Card type substrate 2: Data recording area 5: Data track lO block 11: Number recording section 15: Directory 18 Start number section 19: End number section 20 Start track number section 21: End track number section 25, 26: File Number Department SiniSkei Co., Ltd. Figure 1

Claims (2)

[Claims] (1) In a card-type optical recording medium in which a plurality of strip-shaped areas provided in a data recording area of a card-type substrate are used as data tracks, the data track is divided into a plurality of blocks, and each block is placed in a part of the block. A number recording section is formed in which sequential numbers are written for mutual identification, and some of the data tracks are used as directories, and a start number section is formed in which the sequential numbers of the blocks to be read first are written, and the blocks to be read last. 1. A card-type optical recording medium characterized by having an end number section in which a sequential number is written. (2) Claim 1, characterized in that the directory is provided with a number entry section for writing its own sequential number.
The card-type optical recording medium described in .