Optical disk, optical disk recording method and optical disk apparatus

A reproducing method, comprising:

• reproducing recording data recorded on an optical disk including address data recorded beforehand and recording data written based on the recorded address data, a minimum pit of the written recording data being based on a 2T system, and the address data and the recording data being written in a different recording format,
• wherein the recording data is recorded in such a manner as to be decodable in a partial response maximum likelihood (PRML) decoding system.

A reproducing apparatus, comprising:

• reproducing means for reproducing recording data recorded on an optical disk including address data recorded beforehand and recording data written based on the recorded address data, a minimum pit of the written recording data being based on a 2T system, and the address data and the recording data being written in a different recording format,
• wherein the recording data is recorded in such a manner as to be decodable in a partial response maximum likelihood (PRML) decoding system.

A reproducing apparatus, comprising:

• a reproducing circuit configured to reproduce recording data recorded on an optical disk including address data recorded beforehand and recording data written based on the recorded address data, a minimum pit of the written recording data being based on a 2T system, and the address data and the recording data being written in a different recording format,
• wherein the recording data is recorded in such a manner as to be decodable in a partial response maximum likelihood (PRML) decoding system.