| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem that since a conventional disk diameter conversion adapter has a disk holding part 140 formed on the recording surface side thereof and the disk holding part 140 is protruded from the thickness of a disk 102, an actuator coil is damaged in a Ble-Ray disk having appeared as a new generation high capacity disk. <P>SOLUTION: Loading of a conventionally marketed disk diameter conversion adapter is prevented by providing a loading preventing part 410 of the disk diameter conversion adapter in the circumferential direction on the outer circumferential surface of a disk medium. <P>COPYRIGHT: (C)2009,JPO&INPIT |
