Patent ID: 6157608
Filing Date: 2000-12-05
Classification: G11B

Abstract:
An optical disc having a plurality of sectors, each one of said sectors, sequentially comprising: a first gap field with a no-signal interval, a first guard data recording field for recording guard data, a data recording field containing a synchronous signal and following user data, a second guard data recording field for recording the guard data, and a second gap field with a no-signal interval, the total length of said first and second gap fields being constant, the total length of said first and second guard data recording fields being constant, the length of said first and second gap fields and the length of said first and second guard data recording fields being randomly changeable in every recording, and the changing amount of said first and second gap fields being smaller than the changing amount of said first and second guard data recording fields,wherein the guard data in said first and second guard data recording fields is the same as the recording pattern of the synchronous signal.