Apparatus and method for restoring stability to head of disc drive
US6657428B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 12, 2002 |
| Grant date | Dec 2, 2003 |
| Priority date | — |
| Expiry date | Feb 12, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
There is provided an apparatus and method for controlling a disc drive and, more particularly, an apparatus and method for restoring stability to a head of a hard disc drive, so that instability in a magneto resistive (MR) sensor of the disc drive can be restored through an electric shock. Instability of the MR head, i.e. incorrect alignment of the domain of the MR head, is determined by a bit error rate (BER) test and channel statistical measurement (CSM) test, and instability of the MR head is determined, the MR head is restored by applying electric shocks thereto. Therefore, the apparatus and method have advantages in that manufacturing process inferiority rate due to instability of head in a hard disc drive can be reduced, yield can be improved and the defect rate can be improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.