A loading and unloading device for loading and unloading a head slider has an actuator driver circuit 11 for driving an actuator 3 with pulses. A counterelectromotive force generated by a voice coil of the actuator is detected when the pulses are off, and fed back to the actuator driver circuit 11 to...http://www.google.de/patents/US5663846?utm_source=gb-gplus-sharePatent US5663846 - Driving apparatus for floating-type magnetic head
