Patent · US Active

Disk drive employing different servo TPI to data TPI ratios across the disk surface

US7982993B1 · kind B1 · utility

142Cited by

57References

20Claims

0Family size

Assignee

Western Digital Technologies, Inc. · US

Inventors

Chun Sei Tsai · Tustin, US
William B. Boyle · Lake Forest, US
Carl E. Barlow · Lake Forest, US

Key dates

Filing date	Dec 19, 2008
Grant date	Jul 19, 2011
Priority date	—
Expiry date	Jul 3, 2029

Classification

Technology area (CPC G)Physics
CPC primaryG11B5/59655
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A disk drive is disclosed having a first disk surface, and a head actuated over the first disk surface. The first disk surface comprises a plurality of servo tracks and a plurality of data tracks. The data tracks of the first disk surface are banded together into a plurality of data zones, including a first data zone and a second data zone. A first servo tracks per inch (STPI) to data tracks per inch (DTPI) ratio of the first data zone is substantially different from a second STPI to DTPI ratio of the second data zone.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.