| 摘要 |
PURPOSE:To express all tracks while keeping the compatibility with a conventional recording medium and to easily discriminate an address even at the time of making the track pitch narrower than conventional one. CONSTITUTION:The fact is used that the number of addresses required required on the inner peripheral side of a disk D is smaller than that on the outer peripheral side in a conventional format, and upper four bits out of 16 bits are used like sign bits and the address is expressed by the other bits in the case the address on the inner peripheral side is expressed. The address is expressed by 16 bits including upper four bits in the case the address on the outer peripheral side is expressed. |
