Null servo demodulation for short servo wedge in disk storage systems
US8462454B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 27, 2012 |
| Grant date | Jun 11, 2013 |
| Priority date | — |
| Expiry date | Sep 27, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59655
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a disk storage system, the disk may include a full null servo position error signal (“PES”) wedge, followed by a data wedge, and then a short null servo PES wedge. To improve the accuracy with which information read from the short null servo PES wedge can be used to help keep the read head centered over the information track being read, the short null servo PES wedge may include a calibration field. Information read from the calibration field can be used to compensate the subsequently read PES information in the short wedge for possible sampling phase error that may have accumulated since the full null servo PES wedge was read. This type of short null servo PES wedge also has other possible uses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.