Method and apparatus for RRO learning on alternate tracks before and after shipping to cancel RRO in a disk drive
US6707635B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 5, 2000 |
| Grant date | Mar 16, 2004 |
| Priority date | — |
| Expiry date | Oct 27, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59627
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention may be embodied in a method, and related apparatus, for determining a repeatable runout (RRO) compensation value sets for a plurality of tracks on a disk in a disk drive, wherein the disk drive is initially manufactured and then shipped for installation in a host system. Each track comprises a plurality of embedded servo sectors that define a circumferential path that may have RRO requiring compensation during track following. The method comprises determining first RRO value sets for a first portion of the tracks to a first desired learning level by measuring the RRO for the first portion tracks based on a first predetermined number of disk rotations during the initial manufacturing of the disk drive. The first portion tracks are not adjacent to each other. Then, after the disk drive is shipped for installation in the host system, RRO value sets are determined for a second portion of tracks to a second desired learning level by measuring the RRO for the second portion tracks based on at least a second predetermined number of disk rotations. The learning technique of the invention allows the disk drive to be shipped for installation in a host system with a port…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.