Disk drive centering demodulation windows on spiral tracks during a seek operation
US8451697B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 23, 2011 |
| Grant date | May 28, 2013 |
| Priority date | — |
| Expiry date | Dec 1, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59633
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of spiral tracks. During a seek operation, a demodulation window is opened in response to a window offset during a first revolution of the disk, wherein the demodulation window corresponds to the head approaching a spiral track. A window position error signal (PES) is generated representing a difference between a target framing of the demodulation window around the spiral track crossing and a detected framing of the demodulation window around the spiral track crossing. The window offset is adjusted in response to the first window PES, and the demodulation window is opened in response to the adjusted window offset during a second revolution of the disk.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.