Patent ID: 7606130
Filing Date: 2009-10-20
Classification: G11B

Abstract:
1. An information recording medium on which a record mark having a variable length according to first data is formed at a displaced position to which the record mark is displaced, in a direction crossing a reading direction of the record mark, according to a wobble signal obtained by modulating second data in a predetermined modulating method, wherein a first start position at which a head of the first data is recorded is away in the reading direction of the record mark from a second start position at which a head of the second data is recorded by a predetermined constant value, the first start position is a start position of an error correction unit of the first data, the second start position is a start position of an error correction unit of the second data, a first synchronization signal for the first data is recorded at the first start position, and a second synchronization signal for the second data is recorded at the second start position.