A method and an apparatus to control a disc drive, and more particularly, a method and an apparatus to control a disc drive using an indirectly determined counter-electromotive force. The method of controlling the disc drive using a counter-electromotive force includes determining a change in a servo parameter of the disc drive; and controlling the disc drive based on the determined change.

 
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< Disk drive comprising a mechanical position sensor to prevent a runaway condition

> Self-servo writing using staged patterning

> Head controller, storage device, and head controlling method
~ 00560