Patent ID: 7234150

Claim:
An apparatus comprising: a compact disk drive comprising: a rotatably structured turn table; a clamper rotatably holding a compact disk by holding the compact disk between said turn table and said clamper; a disk tray for holding the compact disk when the compact disk is not between said turn table and said clamper; and a control unit controlling respective operations of said turn table and said clamper; and a control device external to said compact disk drive and configured to: start an application for controlling said compact disk drive when power of said control device is turned on, instruct said compact disk drive to cause said control unit to cancel the holding of the compact disk by said turn table and said clamper when the power of said control device is turned off, and terminate the application for controlling said compact disk drive when said control device receives information from said compact disk drive to the effect that the holding of the compact disk has been canceled.