Techniques for detecting polarity reversals of a disk drive read/write head
US7061704B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 26, 2003 |
| Grant date | Jun 13, 2006 |
| Priority date | — |
| Expiry date | Sep 7, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/09
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Techniques are provided for detecting and correcting polarity reversals in signals generated by read/write heads that are used to read magnetic data. Directional patterns are stored in regions of each data track. The directional patterns are used to indicate whether the read/write head has reversed polarity. The read sensor reads the directional patterns along with other data stored on the disk. Electronic circuitry decodes the directional patterns to determine if the read/write head has reversed polarity. If the circuitry determines that the polarity of the read/write head has reversed, the circuitry reverses the polarity of output signals generated by the read sensor to correct for the polarity reversal of the head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.