Abstract: A microactuator incorporated within an actuator assembly of a disk drive is used as a detection element for rapid off track events that may occur. Preferably, the microactuator employs one or more piezoelectric elements used for purposes of secondary actuation. Uncontrolled movement of the actuator across the disk results in the piezoelectric elements generating a voltage spike or signal that is analyzed to determine whether a rapid off track event has occurred. Rapid off track events are distinguished from other possible events, such as shock events. If a rapid off track event is detected, then remedial actions are taken to restore data integrity, to include executing restore commands such as rewriting selected data tracks. Dedicated piezoelectric elements may also be provided for detecting rapid off track events wherein these elements are not incorporated in the servo loop that controls positioning of the actuator.

Abstract: A head suspension assembly comprising a visco-elastic coupling between a load beam dimple or protrusion and a suspension flexure to which a slider is rigidly coupled. The damping material is selected for a low static modulus, which reduces mechanical vibration by absorbing kinetic energy and releasing the energy as heat. The gimbaling function of the suspension is not significantly effected by the damping material because the damping effect occurs primarily when there is an undesirable relative velocity (movement with respect to time) between the dimple and the flexure.