Disk drive initializing servo read channel by reading data preceding servo preamble during access operation

摘要

A disk drive is disclosed comprising a disk having a plurality of data tracks defined by servo sectors, where each data track comprises a plurality of data sectors, and each servo sector comprises a servo preamble and servo data. The disk drive further comprises a head comprising a read element and a write element, and a servo read channel comprising an analog front end and a timing recovery circuit. During an access operation, data preceding the servo preamble of a first servo sector in the first data track is read in order to initialize the analog front end of the servo read channel. At least part of the servo preamble is read to initialize the timing recovery circuit of the servo read channel, and at least part of the servo data of the servo sector is read using the timing recovery circuit.

主权项

1. A disk drive comprising:
a disk comprising a plurality of data tracks defined by servo sectors, where each data track comprises a plurality of data sectors, and each servo sector comprises a servo preamble and servo data; a head comprising a read element and a write element; and control circuitry comprising a servo read channel configured to read the servo sectors, the servo read channel comprising an analog front end and a timing recovery circuit, the control circuitry operable to:
during an access operation position the head over a first data track; andduring a revolution of the disk, access a first data sector of the first data track, and after accessing the first data sector:
read data preceding the servo preamble of a first servo sector in the first data track in order to initialize the analog front end of the servo read channel;read at least part of the servo preamble to initialize the timing recovery circuit of the servo read channel; andread at least part of the servo data of the first servo sector using the timing recovery circuit of the servo read channel,wherein the data preceding the servo preamble comprises data of the first data sector in the first data track preceding the first servo sector.