| 摘要 |
PURPOSE:To allow the use of the required recording information with the same disk even if the recording on the same optical disk is not possible by freely attachably and detachably combining the annular optical disks of a read only type on one side and a DRAW type or rewriting type on the other. CONSTITUTION:The freely attachable and detachable combination disk is formed if the outside annular optical disk 13 of the DRAW type or rewriting type is combined with the freely attachable and detachable inside annular optical disk 12 of the read only type and is stopped to a cover 14 by a combining fastener 15 after the disk 12 is inserted to the cover 14. If the information of the capacity larger than the capacity at which the recording on the disk 12 is not possible is recorded on the disk 13, the disk 13 is effectively utilizable as it is even after the exchange of the disk 12 and even when the recording on the same disk is not possible according to this constitution. The use of the necessary recording information with the same disk is thus possible. |
