Patent ID: 6418111
Filing Date: 2002-07-09
Classification: G11B

Abstract:
An optical disk compatible with a read-only optical disk which includes a read-only area having a plurality of read-only tracks, each of the plurality of read-only tracks being divided into a plurality of first sectors, signals being prerecorded in at least one of the plurality of first sectors under a predetermined reproduction format, the optical disk comprising a read-only area in which a plurality of read-only tracks are formed and a rewritable area in which a plurality of rewritable tracks are formed,wherein each of the plurality of read-only tracks is divided into a plurality of first sectors, a signal is prerecorded in at least one of the plurality of first sectors under the predetermined reproduction format, each of the plurality of rewritable tracks is divided into a plurality of second sectors, a signal is recordable in at least one of the plurality of second sectors under a predetermined recording format which includes the predetermined reproduction format as a part thereof and further includes another part specific to the predetermined recording format, and the read-only area is located on an inner portion of the optical disk, while the rewritable area is located on an outer portion of the optical disk.