Patent ID: 6373815
Filing Date: 2002-04-16
Classification: G11B

Abstract:
An optical disc, comprising: a plurality of sectors on a guide track, each of said sectors having an ID field, an information recording field, and an information unrecorded field disposed between said ID field and said information recording field, said ID field including a plurality of address information recorded in convex and concave signals and arranged in two sets, each set being offset by about Â½ track pitch in the direction of one of an internal and external circumferential track adjacent to said guide track, said information recording field comprising grooves and lands oscillating at a single frequency in a radial direction with respect to said guide track, and said grooves and lands alternating in every turn of said guide track;wherein the beginning of information in at least one of a plurality of said recording fields is detectable based on a specific phase of said oscillating frequency Previously determined prior to recording.