OPTICAL DISK MEDIUM, OPTICAL DISK SYSTEM, AND OPTICAL DISK PLAYBACK METHOD

摘要

PROBLEM TO BE SOLVED: To provide an optical disk medium which records a larger amount of user data in the optical disk with the same sizes by reducing a redundant capacity used for data other than actual user data such as a header or an accessory of the optical disk medium.

SOLUTION: The optical disk medium comprises a track groove along which main information is recorded. The track groove is divided into a plurality of blocks. The plurality of blocks include a plurality of frames. Each of the plurality of frames includes one shape of wobbles indicating sub information among a plurality of prescribed shapes of wobbles. The plurality of blocks have address information. The address information is represented by at least one piece of sub information represented by shapes of wobbles of at least one of the plurality of frames.

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