Monitoring of phenomena indicative of PTP in a magnetic disk drive
US6980383B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 19, 2003 |
| Grant date | Dec 27, 2005 |
| Priority date | — |
| Expiry date | Feb 19, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A PTP test subsystem of a magnetic disk drive identifies an undesired pole tip protrusion (PTP) condition, and takes steps to prevent problems associated with PTP. A PTP stressing mechanism stresses the disk drive during a PTP test mode to induce a PTP condition. A disk contact detection circuit detects when a head of the disk drive contacts the disk. A PTP write current determining circuit is also provided which comprises a write current level detector to ascertain a write current level at which the disk contact detection circuit detects when the head of the disk drive contacts the disk while the disk drive is stressed during the PTP test mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.