Patent ID: 7403461
Filing Date: 2008-07-22
Classification: G11B

Abstract:
1. A disk recording medium having a groove, said groove being formed in a spiral fashion to form a track on the disk, said disk recording medium comprising: a recording and reproducing area in which address information is recorded by wobbling of said groove and the track formed by said groove is used for recording and reproducing mark information; and a reproduction-only area in which prerecorded information is recorded by wobbling of said groove, wherein as a synchronizing signal of said prerecorded information, said prerecorded information has a plurality of synchronizing signals; each of said synchronizing signals comprises a pattern out of rules of modulation of said prerecorded information and an identification pattern for identifying the synchronizing signal; and said identification pattern is obtained by modulating an identification number and an even parity bit of the identification number by an FM code.