Disk drive with wide servo burst pattern and wide servo sensing element
US6456449B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 7, 1997 |
| Grant date | Sep 24, 2002 |
| Priority date | — |
| Expiry date | Aug 7, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59655
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magneto-resistive (M-R) head has a read element with a servo sensing width as wide as a data track width and a data sensing width of less than one data track width. The two read sensing widths are achieved by using a single read element having a center electrical contact from the M-R read element that effectively reduces the sensing width of the read element. In a first embodiment, the servo sensing width comprises a first portion of the read element and the data sensing width comprises a second, smaller portion of the read element. In a second embodiment, the servo sensing width comprises the entire read element width and the data sensing width comprises a portion thereof. In yet another embodiment, abutting read elements are constructed to enable separate optimization of each sensing width. The wide servo sensing width permits use of a wide servo pattern having servo bursts as wide as a data track width. A position error sensing (PES) signal produced with the wide servo read element and wide servo pattern has increased linearity and accuracy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.