| 摘要 |
<p>The overwrite (OW)-type cartridge is provided with a mark for discriminating if it is of the OW type or the non-OW type. Any mark can be used if it can be easily identified by a man. The mark may be the one that is recognized electrically, magnetically or by any other means. In such a case, a sensor for detecting the mark should be provided for either one or both of the magnetooptical recording devices. Alternatively, a protrusion as the mark can be provided on the outer side of the OW-type cartridge may be used as a mark. The protrusion stops this cartridge from entering the slot in the conventional non-OW-type magnetooptical recording device, thereby causing no trouble. Instead, the OW-type magnetooptical recording device must have slot that permits even the cartridge with a protrusion to be inserted.</p> |
