DISK DRIVE CORRECTING AN ERROR IN A DETECTED GRAY CODE

摘要

A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of tracks defined by a plurality of servo sectors. An estimated track ID is generated and a plurality of proximate track IDs is generated having values proximate the estimated track ID. A set of Gray codes is generated each corresponding to the estimated track ID and the proximate track IDs, wherein each Gray code in the set of Gray codes comprises N bits, and M bits out of a high order of the N bits comprise the same value. A recorded Gray code is detected in a first servo sector to generate a detected Gray code, and an error in the detected Gray code is corrected by inverting at least one bit in the detected Gray code comprising a value that is different from the value of the corresponding bit in the M bits.

主权项

1. A disk drive comprising:
a disk comprising a plurality of tracks defined by a plurality of servo sectors; a head actuated over the disk; and control circuitry operable to:
generate an estimated track ID representing an estimated radial location of the head;detect a Gray code in a first servo sector to generate a detected Gray code;convert a subset of the detected Gray code into a partial track ID; andcombine the estimated track ID with the partial track ID to generate a detected track ID.