| 摘要 |
PROBLEM TO BE SOLVED: To extend an expression range of a track number and an index number of a sub-code keeping interchangeability for a standard disk. SOLUTION: A value which can be expressed as a track number in a range of 8 bits being same as a conventional sub-code format, a track number indicated by point information, and an index number is extended by using a binary code of 8 bits in track number information of a sub-code, point information, and index information index information. Also, conflict of a setting value of conventional specific definition as a track number and point is prevented by restricting a value corresponding to a track number itself or an index number itself to a range of '01'-'9F' in a binary code, thereby, interchangeability is kept suitable.
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