| 摘要 |
PURPOSE:To leave clock signals on a disk even when data is erased by providing an auxiliary tracking area in which tracking information and clock information are recorded in the side of the main tracking area. CONSTITUTION:The optical disk 1 has an information recording area such as read-in area 2, data recording area 3, read-out area 4, etc., Plural numbers of main track areas 8 to record data are provided in the tangential direction in the recording area, with auxiliary track areas 9 are provided between the adjacent track areas 8. The main track area 8 consists of such a material which enables erasing and writing, while clock signals are recorded by stamping in the auxiliary area 9. Thereby, on erasing data, clock signals remain on the disk. |
