A disk playback device comprises a magazine having a plurality of disk spaces for accommodating disks in an upright position, and an inlet-outlet portion provided externally of the magazine for permitting the disk to pass therethrough into the magazine from outside a device main body. Sensors for detecting...http://www.google.co.uk/patents/US5892738?utm_source=gb-gplus-sharePatent US5892738 - Disk recording-playback device and disk loading or unloading method
