Patent ID: 7317679

Claim:
A method for recording digital information on an information storage medium having an area being divided by sectors, wherein at least one of said sectors is configured to include sync frames, said sync frames are configured to include four sync codes represented by SY 0 , SY 1 , SY 2 , and SY 3 , one or more guard areas is/are configured to be provided on the information storage medium, and the SY 1 of said sync codes is configured to be provided at a leading portion of said guard area, said SY 1 being a second occurrence of the sync codes in the at least one sector, said method comprising: providing the sync frames in at least one of said sectors, providing the four sync codes in said sync frames, providing one or more of said guard areas on the information storage medium, and providing the SY 1 of said sync codes at a leading portion of said guard area.