| 摘要 |
A motor (2) for rotating a disk; a head (3) for recording/reproducing information of the disk; a tray (1) on which a first cartridge and a second cartridge that accommodate the disk respectively and have different outside shapes can be mounted selectively; a transferer (7, 1k) for transferring the tray (1); a detector (4) for detecting an outside shape difference between the respective cartridges; a disk cartridge guide (1d) for positioning the respective cartridges such that, when mounting the respective cartridges on the tray (1), centers of the respective disks accommodated in the respective cartridges do not coincide with each other; and a transferring distance changer (5, 10a, 1g, 1h, 1i) that can change a transferring distance of the tray (1) of the transferer (7, 1k) based on a result of the detector (4), and can transfer the tray (1) to a position where the centers of the respective disks accommodated in the respective cartridges coincide with a substantial center of the motor (2) are provided.
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