US 8,553,351 B1Granted

Disk drive correcting track ID in response to an estimated radial location and a burst PES

AssigneeWestern Digital Technologies, Inc.

InventorsAswartha Narayana, Chuanwen Ji, Duc T. Phan, Min Chen, Hengchang Guo

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Abstract

A disk drive is disclosed comprising a head actuated over a disk, the disk comprising a plurality of servo tracks defined by a plurality of servo sectors. An estimated radial location of the head is generated in response to an actuator control signal. A Gray coded track ID is detected from reading a servo sector, and decoded into a detected track ID. A burst position error signal (PES) is generated from reading servo bursts in the servo sector, wherein the burst PES represents a detected fractional servo track offset of the head. When the detected track ID is corrupt, a corrected track ID is generated using the estimated radial location and the burst PES, and the actuator control signal is adjusted in response to the corrected track ID and the burst PES.

Claims8

Dependent claims

A disk drive comprising:

a disk comprising a plurality of servo tracks defined by a plurality of servo sectors, each servo sector comprising a Gray coded track ID and servo bursts;
a head;
an actuator for actuating the head over the disk;
and
control circuitry operable to:
generate an actuator control signal applied to the actuator;
generate an estimated radial location of the head in response to the actuator control signal;
detect a Gray coded track ID from reading one of the servo sectors;
decode the detected Gray coded track ID into a detected track ID;
generate a burst position error signal (PES) from reading the servo bursts in the servo sector, wherein the burst PES represents a detected fractional servo track offset of the head;
and
when the detected track ID is corrupt:
generate a corrected track ID using the estimated radial location and the burst PES;
and
adjust the actuator control signal in response to the corrected track ID and the burst PES.

12 more elements

Dependencies are inferred from the claim text.