Patent ID: 6600706
Filing Date: 2003-07-29
Classification: G06K,G11B

Abstract:
An optical disk comprising:a first recording area where main information is recorded, a second recording area where barcode-like marks, each of which has a strip-like configuration in a radius direction and which are disposed in a circumferential direction, are recorded as sub information, wherein said first recording area contains at least a lead-in area from which data recording starts, and a control data area in which is represented by a physical property of the optical disk, second recording area is disposed inside said control data area on said first recording area and said second recording area is overlapped with said lead-in area, said sub information is PE-modulated to be recorded on said second recording area so that a width of said barcode-like marks is half or less than a period of said barcode-like marks, and said sub information is disposed at a radial position which lies closer to the disk center than the radial position of the control data area.