JP2876124B2 - Method of recording data on card type optical recording medium - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for recording data on a card-type optical recording medium having a band-shaped data track formed in a data recording area of a card-type substrate.

[Related Art] In recent years, a card-type optical recording medium (optical memory card) using a band-shaped area provided in a data recording area of a card-type substrate as a data track has attracted attention.

By the way, in the conventional optical memory card, each data track of the data recording area is divided into a plurality of blocks, and when writing a file to the data track,
The file is divided for each block size (recording capacity) and written sequentially in block units.

Further, in such an optical memory card, some data tracks are used as directories as shown in FIG. The directory includes a file entry 30 for recording the name and attribute of a file to be written, and a file allocation table (hereinafter referred to as FA) for recording a sequential number for identifying a block to which the file is written.
T) 40). The FAT 40 has a structure in which a plurality of number recording units 41 having a length of several bytes are arranged in correspondence with blocks.

When writing file data in block units, it is checked whether the data has been written correctly. If the data has been written correctly, the number recording unit 41 corresponding to the block is checked.
Write the sequential number to Data track scratches,
If writing is not performed correctly due to dirt or the like, the same data is written to the next consecutive block, and the same serial number as the block in which the writing error has occurred is written to the corresponding number recording unit 41. At this time, certain identification data (XX) indicating that reading of the block is invalidated is written in the number recording unit 41 corresponding to the block in which the writing error has occurred.

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

[Problems to be Solved by the Invention] In the above-described conventional method of recording data on a card-type optical recording medium, when writing file data, writing a sequential number to a directory and writing data to a block are performed separately. However, there is a disadvantage that the data writing efficiency is reduced.

Further, since the sequential numbers of the blocks are written in the directory, there is a disadvantage that the area used for the directory increases.

[Means for Solving the Problems] In order to solve the problems in the above-mentioned conventional method of recording data on a card-type optical recording medium, the present invention provides a method of recording data on a card-type substrate. A data recording method for a card-type optical recording medium, wherein a data track is divided into a file area for recording a file and a directory area for forming a directory, and the data track in the file area is divided to form a plurality of blocks. (A) A sequential number for identifying each block of the file area, a data of a file to be recorded, and a file number of a file to be recorded are assigned to each block of the file area until the last data is written. (B) when a write error occurs in (a) above, the sequence (C) writing the serial number, data, and file number in the block next to the same data track or the block in the next data track with respect to the block in which the write error has occurred; and (c) the steps (a) and (b). )), For the directory in the directory area, the sequential number of the directory itself, and the above (a) and (b)
(D) writing the sequential number of the directory itself and the file number to the next directory when a write error occurs in (c). It is characterized by consisting of.

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 FIG. 1, a card-type optical recording medium according to the present embodiment has a plurality of strip-shaped areas provided in parallel with a data recording area 2 on a card-type substrate 1 at regular intervals as data tracks 5.

In this embodiment, the data track 5 is divided into a file area 6 for recording a file and a directory area 7 for forming a directory. As shown in FIG. 2, the data track 5 of the file area 6 is divided into a plurality of blocks 10 each having a fixed length. At the head of the block 10, a number recording unit 11 for recording a sequential number for identifying each block 10 is formed. The number recording unit 11 has a length of several bytes. For example, if the length is 2 bytes, a sequential number from 0 to 65535 can be recorded. 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 on the data track 5 of the directory area 7 is, as shown in FIG.
A directory number entry section 16 for writing its own sequential number, a file name entry section 17 for writing a file name,
For each file, a start number section 18 in which the sequential number of the block 10 to be read first at the time of reading the file is written, and an end number section to which the sequential number of the block 10 to be read last at the time of reading the file are written. Consists of nineteen. With such a directory 15, when reading a file, the block 10 at the beginning and end of reading can be immediately recognized, and reading can be performed efficiently.

When the sequential number of the block 10 is added for each file unit, the directory 15 has a structure as shown in FIG. Directory number entry section 16, File name entry section 17, Start number section 18, End number section 19
In addition to the above, there are provided a start track number section 20 in which the number of the data track 5 having the first block 10 is written, and an end track number section 21 in which the number of the data track 5 having the last block 10 is written. As a result, the read range of the file can be quickly identified.

As described above, in this embodiment, only the start number section 18 and the end number section 19 are provided without directly recording the sequential number for identifying the block 10 in the directory 15, and the length of the directory area 7 can be reduced.

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

When writing and checking a file for each block 10, the file data and the sequential number are written to the block 10 as shown in FIG. A write check is performed, and if normal, the next sequential number and data are written in the next block 10. In the case of a write error, the data of the block 10 is erased and the same sequential number and data are written again to the next block 10. This rewriting is repeated until the writing is correctly performed. In this way, data is written up to the last data. In the figure, the block 10 in which the write error has occurred is indicated by an X mark.

When a file is written for each of a plurality of blocks 10, for example, for each data track 5, a sequential number and data are written to all the blocks 10 of the data track 5 by one write operation as shown in FIG. In that case, a check is also performed for each data track 5 so that the sequential number and data of the block 10 in which the write error has occurred are incorporated into the block 10 of the next data track 5. If writing is performed for each of the plurality of blocks 10 in this manner, the writing processing speed is greatly improved.

When a sequential number is written over the entire block 10, the directory 15 shown in FIG. 3 is used. When a sequential number is written for each block 10 used for recording a file, the directory 15 shown in FIG. Is used.

As shown in FIG. 7 (A), the data track 5 has a file number portion 25 for writing a file number in addition to the number recording portion 11, and the directory 15 has a file number portion for writing a corresponding file number. The unit 26 may be provided in the same procedure as described above. In this case, the file number part 25
By comparing the file numbers of the file and the file number section 26 with each other, the file can be quickly recognized at the time of reading. Also in this case the directory
15 structures can be made extremely simple.

If an error occurs in writing to the directory 15, the same sequential number may be written to the directory number entry section 16 of the next directory 15 and the directory contents may be written again, so that it is possible to easily cope with a writing error. .

In the above embodiment, the case where the blocks 10 extend continuously is shown, but the blocks 10 may be separated from each other via a gap having a predetermined length.

[Effects of the Invention] As described above, according to the present invention, (a) the sequential number for identifying each block of the file area from each other, the data of the file to be recorded, and the number of the file to be recorded are set to the last. Writing data sequentially to each block in the file area until data is written; and (b) when a write error occurs in (a), the sequential number, data and file number are written. Writing to the next block of the same data track, or the block of the next data track, for the resulting block;
(C) a step of, after (a) and (b), writing the sequential number of the directory itself and the number of the file recorded in (a) and (b) into the directory in the directory area And (d) writing a sequential number of the directory itself and a file number to the next directory when a write error occurs in the above (c), thereby writing the sequential number in the directory. Compared to writing file data, sequential numbers and file data can be written at the same time, so the writing speed is faster, it is easier to deal with write errors, the write processing efficiency is improved, and the area used for the directory is reduced. can do.

Further, since the file number is written not only in the directory but also in the block, the file in reading can be quickly recognized by comparing the file numbers with each other. Further, the structure of the directory can be extremely simplified.

Furthermore, since the sequential number of the directory itself is written in the directory, if an error occurs in writing the directory, the same sequential number should be written in the next directory and the directory contents can be written again, and the write error can be avoided. It is easy to respond.

[Brief description of the drawings]

FIG. 1 is an external view of a card-type optical recording medium according to one embodiment of the present invention, FIG. 2 is an enlarged view of a main part of the card-type optical recording medium according to one embodiment, and FIGS. 5 and 6 are diagrams each showing a structure of a directory, FIGS. 5 and 6 are diagrams each showing a method of writing file data to a card-type optical recording medium, and FIGS. 7 (A) and 7 (B) are other examples of sectors. FIG. 8 is a diagram showing another example of a directory of a conventional optical recording medium. 1: Card type board 2: Data recording area 5: Data track 10: 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 part

Claims (1)

(57) [Claims] A plurality of band-shaped data tracks of a data recording area formed on a card type substrate are divided into a file area for recording a file and a directory area for forming a directory, and the data track of the file area is divided. A method of recording data on a card-type optical recording medium by forming a plurality of blocks by: (a) a sequential number for identifying each block of the file area from each other, data of a file to be recorded, and a file to be recorded And (b) sequentially writing the sequential number, data and file in the case of a write error in (a) until the last data is written. And the number of the same data track for the block where the write error occurred. (C) after the above (a) and (b), for the directory in the directory area, the sequential number of the directory itself and the (a) And (b) writing the number of the file recorded in (b). (D) When a write error occurs in (c), the sequential number of the directory itself and the file number are stored in the next directory. Writing a data to a card-type optical recording medium.