Optical disk apparatus and address detection method

摘要

An optical disk apparatus comprises a Gray code detector for detecting a Gray code of a track address, a position detector for detecting, as an address uncertain position, a least significant bit of the detected Gray code of the track address and a bit of the detected Gray code of the track address and is higher by one than a bit position of a least significant code bit "1", and a replacing unit which replaces a bit at the address uncertain position of the land address with a bit at a corresponding position of the groove address of the same track, and replaces a bit at the address uncertain position of the groove address with a bit at a corresponding position of the land address of the same track.