Patent Number: 7,715,138

Title: Disk drive estimating a servo zone after synchronously detecting a servo sync mark

Abstract: A disk drive is disclosed comprising a disk having a plurality of servo sectors defining a plurality of servo tracks that form a plurality of servo zones. The disk drive further comprises a head actuated radially over the disk for generating a read signal, and control circuitry including a timing circuit. The timing circuit is initialized with a nominal center frequency that approximates an average servo data rate out of the plurality of servo zones. The timing circuit is synchronized to the read signal to generate synchronous read signal samples. A servo sync mark is detected from the synchronous read signal samples, and the servo zone the head is reading is estimated after detecting the servo sync mark.

Inventors: Kupferman; Hanan (Diamond Bar, CA)

Assignee: Western Digital Technologies, Inc.

International Classification: G11B 5/09 (20060101)

Expiration Date: 5/11/12018