Methods of measuring TPTP of magnetic head and controlling recording current
US6999256B2 · kind B2 · utility
10Cited by
6References
28Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 12, 2003 |
| Grant date | Feb 14, 2006 |
| Priority date | — |
| Expiry date | Aug 1, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0013
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of measuring the degree of thermal pole tip protrusion (TPTP) of a magnetic head and controlling a recording current in consideration of the degree of TPTP, in relation to a hard disk drive includes measuring the rate of errors contained in data by performing writing and reading operations while changing the level of an overshoot current (OSC), detecting a minimum error rate and a maximum error rate while changing a range of the OSC, and determining the degree of TPTP by measuring the difference between the minimum error rate and the error rate at the maximum OSC.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.