Patent ID: 7770190

Claim:
A disk unit, comprising: a plurality of arms configured to convey both a large diameter disk or a small diameter disk to the interior of the disk unit while supporting an outer periphery edge of the conveyed disk during automatic loading, and configured to remove the conveyed disk from the interior of the disk unit to the exterior of the disk unit during automatic unloading; at least a first limit switch and a second limit switch; and a guide arm located to pivot when pressed by an outer periphery edge of the conveyed disk upon insertion of the conveyed disk from a slot of a bezel, and to selectively actuate the first limit switch or the second limit switch based on at least the size of the conveyed disk; wherein the first limit switch is actuated by the guide arm and the second limit switch is not actuated by the guide arm upon insertion of the large diameter disk, and wherein the second limit switch is actuated by the guide arm and the first limit switch is not actuated by the guide arm upon insertion of the small diameter disk, and wherein whether the conveyed disk is either the large diameter disk or the small diameter disk is determined on the basis of a state of operation of the at least first limit switch and the second limit switch.