| 摘要 |
An apparatus and a process for positioning a read/write head in a hard disk drive, and more particularly for using the phenomenon of repeatable run-out to efficiently compensate a servo loop used for positioning the head, is provided. The apparatus includes a processor and a read/write channel for a hard disk drive, wherein the processor is configured to calculate repeatable run-out values using position-error-signal (PES) values. The position-error-signal values are contained within an original servo wedge, which is stored on a disk medium. The original servo wedge includes a sync field, an identification field, and at least one position error field. The identification field includes a sync-mark. The processor is configured to use the at least one set of repeatable run-out values to generate a new servo wedge containing updated position information such that the actuator current is minimized. The processor is also configured to cause the new servo wedge to be written to the disk medium. The new servo wedge may be written to a predetermined location of the disk medium. The predetermined location may be determined by using a fixed time interval and the sync-mark of the original servo wedge. The original servo wedge may be erased or overwritten with data.
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