| 摘要 |
PROBLEM TO BE SOLVED: To minimize confusion and signal quality decline possible to occur in the compatibility of a new standard corresponding device and an old standard corresponding device. SOLUTION: As protective information for protecting the recording area of a disk where the code string of a new standard is recorded from recording, editing and erasing operations by the old standard corresponding device capable of referring to only a management data area, 1 is raised on the protective flag of a track mode. At the time of using the disk where the code string of the new standard is recorded by the old standard corresponding device, when 1 is raised on the protective flag, the recording area of the disk is protected from the recording, editing and erasing operations by the old standard corresponding device.
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