Hard disk head control

摘要

A method of controlling a head suspension in a hard disk drive is described. A control signal is applied to an actuator of the head suspension to separate the head from the disk when the speed of rotation of the disk is below the speed required to generate sufficient air-flow to fly the head above the surface of the disk. The actuator is a piezoelectric ceramic strip applied to the head suspension and which controls the height of the head suspension, to separate the head by a predetermined distance from the disk, by expanding or contracting in response to the control signal. A further strip of piezoelectric ceramic generates a feedback signal.