Patent ID: 6587428
Filing Date: 2003-07-01
Classification: G11B,H04L

Abstract:
An information record disc comprising:a track formed on a disc surface, on which record information to be reproduced is recorded or to be recorded; and a wobble formed on said track such that a phase of said wobble is changed at a plurality of locations on said track and that positional information indicative of a position on said disc surface is recorded with an arrangement of wobble-groups each of which includes a plurality of said wobbles each having an identical phase, wherein said record information includes a synchronization signal, which is arranged at a predetermined interval, to attain a synchronization when said record information is recorded or reproduced, and an interval of beginning positions of said wobble-groups on said track is equal to N times (N is an integer equal to or greater than 1) of the predetermined interval of said synchronization signal when said record information is recorded on said track.