| 摘要 |
<p>At the conclusion of a track seek operation, handoff to track following servo control is delayed for a short time period during which the drive microprocessor (30) determines if the head (10) has failed to stop at the target track by sensing the occurrence of a predetermined number of track crossing pulses, the detection of which causes iterative generation and application of braking current pulses to the head actuator motor (11). The amplitude and duration of each braking current pulse is chosen to cause forward motion of the head (10) to be retarded to a predetermined percent of its pre-existing velocity. The microprocessor routine includes provision for iteratively determining when the head (10) has slowed to a velocity which allows the track following servo (16) to acquire control of the head (10).</p> |
