Registers – Records – Particular code pattern
Patent
1990-10-02
1992-11-17
Weinhardt, Robert
Registers
Records
Particular code pattern
235487, 369 59, 3692753, G06K 1906, G11B 7007
Patent
active
051645777
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a card type optical recording medium for optically writing and reading data.
BACKGROUND ART
Recently, a card type optical recording medium (to be called an "optical memory card" hereinafter), arranged in such a manner that a plurality of tracks are formed in a recording region provided on a card type substrate so that data may be optically read and written along the tracks thus formed, has attracted attention.
A conventional optical memory card has, as shown in FIG.3, a recording region 11, to which data can be written and from which data can be read, on a card type substrate 10 thereof. Furthermore, a multiplicity of elongated tracks 12 are formed in the recording region 11. The recording region 11 is mainly divided into a data region 13 to which data is recorded and a directory region 14 to which recording addresses of the recording data or the like are written.
Each of the tracks 12 in the data recording region 13 is divided into, for example, three blocks 15 as shown in FIG. 4. As a result, when a file (a set of data items) is written to the track 12, the file is divided into sections which correspond to the blocks 15 so that the divided sections are sequentially written. A number recording portion 16 to which the address of each of the blocks 15 is written in the form of a binary code is formed in the leading portion of each of the blocks 15 so that the blocks 15 can be distinguished from one another. In the case of a write error, the same address as that for the erroneous block is written to the next block. As a result, it is arranged in such a manner that, if the same address are successively read, the latter block is read.
As shown in FIG. 5, a file entry 20 to which the name and the attribute of the file are recorded, a start block number portion 21, to which the address of the first block 15 to which the above-described file is written, is written and an end block number portion 22 to which the address of the last block 15 is written, are formed in each of the tracks 12 in the directory region 14 in such a manner that they correspond to the file recorded to the data recording region 13.
The optical memory card structured as described above sometimes includes a defective block in which data cannot be written and read from the track 12 of the data recording region 13. Therefore, when data is desired to be read, the good or bad condition of the block 15 is determined whenever the block 15 is accessed. If it has been determined that the subject block 15 is defective, the reading of that block 15 is neglected and the next block 15 is accessed. Therefore, when the conventional optical memory card is accessed, all of the blocks 15 must be accessed so as to determine the good or bad condition of all of the blocks 15 before data is read. As a result, a problem arises in that the reading speed may be deteriorated by a degree corresponding to the number of accessing of the defective blocks.
Furthermore, another problem arises in that the data capacity becomes reduced since the address must be written to the blocks 15 in the data recording region 13.
SUMMARY OF THE INVENTION
In order to overcome the above-described conventional problems, an aspect of the present invention comprises a card type optical recording medium arranged in such a manner that a plurality of tracks are formed on a recording region provided on a card type substrate and the tracks are divided into a plurality of blocks so that data is optically recorded to each of the blocks. The card type optical recording medium is characterized in that: a portion of the recording region is provided with a defective block information region for determining the good or bad condition of the block(s) to which the data is recorded.
It is preferable that the defective block information region has a region to which a bit expressing the good or bad condition of each of the blocks is written corresonding to each of the blocks.
Furthermore, another aspect of the present invention lies in a card type optical
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patent: 4964094 (1990-10-01), Satoh et al.
patent: 4979159 (1990-12-01), Tsuruoka et al.
patent: 5005165 (1991-04-01), Yamanaka et al.
Kabushiki Kaisha CSK
Weinhardt Robert
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