Method and apparatus for providing amplitude instability data recovery for AMR/GMR heads
US6249394A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 12, 1999 |
| Grant date | Jun 19, 2001 |
| Priority date | — |
| Expiry date | Feb 12, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for providing amplitude instability data recovery for AMR/GMR heads during amplitude loss using MSE and/or amplitude envelope detection procedures. The method includes (a) initiating a data recovery procedure by selecting a detection mode for detecting when an error condition occurs, (b) performing the selected detection mode, (c) determining a reset action for resetting the magnetic head, (d) performing the reset action to reset the magnetic head and (f) re-reading data in the track after performing the reset action. An embodiment of the invention further includes (g) determining whether the resetting of the magnetic head allowed recovery of the data in the track and (h) terminating the data recovery procedure when the data is recovered. An embodiment of the invention further includes (i) determining whether predetermined limits have been exhausted when the data is not recovered, (j) terminating the data recovery procedure when the predetermined limits have been exhausted and repeating steps (a)-(g) when the predetermined limits have not been exhausted. In an embodiment of the invention, the determining a reset action for resetting the magnetic head further …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.