Patent Number: 8,576,506

Title: Disk drive estimating reader/writer gap across servo zones

Abstract: A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of servo sectors defining a plurality of servo tracks. The servo tracks form a plurality of servo zones. A disk locked clock is synchronized relative to a servo data rate of the servo zone the head is over. A first reader/writer gap is measured in cycles of the disk locked clock at a first servo track in the first servo zone. A second reader/writer gap is measured in cycles of the disk locked clock at a second servo track in the second servo zone. The first and second reader/writer gaps are normalized to generate a normalized first and second reader/writer gaps. A third reader/writer gap is estimated in cycles of the disk locked clock at a third servo track in the second servo zone based on the normalized first and second reader/writer gaps.

Inventors: Wang; Honge (Irvine, CA), Chang; Michael (San Jose, CA), Dhanda; Abhishek (San Jose, CA), Ruan; Huanxiang (Irvine, CA), Guo; Guoxiao (Irvine, CA)

Assignee: Western Digital Technologies, Inc.

International Classification: G11B 5/09 (20060101)

Expiration Date: 1/05/12017