Patent ID: 7342866

Claim:
An optical disc comprising: a recording track being wobbled that is divided into a plurality of physical segments; each one of the physical segments being divided into a pluralily of wobble data units; each one of the wobble data units being configured by a modulated portion of 16 wobbles and an unmodulated portion of remaining wobbles; and the wobble data unit of a head portion of each one of the physical segments is configured as a synchronous (SYNC) field with a format of a modulated portion of 6 wobbles having an inverse phase wobble (IPW), an unmodulated portion of 4 wobbles having normal phase wobble (NPW), and a modulated portion of 6 wobbles of inverse phase wobble (IPW); wherein information as unit of a data segment is recorded on the recording track, and the top of the data segment is set in the vicinity of 24th wobble from the head of the SYNC field.