Patent ID: 6775091
Filing Date: 2004-08-10
Classification: G11B

Abstract:
Apparatus in a hard disk drive having a read/write head, a disk medium, and an actuator for positioning the read/write head with respect to the disk medium, the disk medium including at least one original servo wedge, the at least one original servo wedge including a sync-mark, said apparatus comprising:a processor; and a read/write channel in communication with the processor, the processor configured to: (a) instruct the read/write channel to retrieve the at least one original servo wedge from the disk medium, (b) calculate at least a first set of repeatable run-out values using position-error-signal (PES) values contained in the at least one original servo wedge, (c) use at least the first set of repeatable run-out values to generate a new servo wedge containing updated position information such that the actuator current is minimized; and (d) instruct the read/write channel to supply the new servo wedge to the read/write head for storage on the disk medium.