Magnetic recording medium with laser-formed servo-marks
US6549360B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 13, 1999 |
| Grant date | Apr 15, 2003 |
| Priority date | — |
| Expiry date | May 13, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59633
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium is formed with a distribution of laser micromachined servo-marks in the form of pits or indentations with an attendant reduction in servo-tracking area and increased data-recording speed. Embodiments include laser texturing to form a radially extending linear or arcuate series of circular or elliptical pits across the data zone. The micromachined servo-marks are detected by mechanical or electrical means and denote the beginning and end of magnetically recorded servo-information in a data track, thereby enabling accurate and timely positioning of the read/write head by the servo-controller of the hard drive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.