Radial self-propagation pattern generation for disk file servowriting
US6476989B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 3, 1999 |
| Grant date | Nov 5, 2002 |
| Priority date | — |
| Expiry date | May 3, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59633
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An improved servowriting system and method whereby errors introduced into the written servo information are reduced or eliminated for greater servowriting accuracy. Accuracy is enhanced by one or more of the following improvements: 1) optimizing write current and write frequency to minimize write width modulation; 2) optimizing the RPM of the storage medium to minimize random mechanical vibration; and 3) providing a clip level check to eliminate the introduction of large errors in product servopattern. The proposed improvements provide substantial rejection of, for example, mechanical and magnetic disturbances, ensuring a robust servowriting process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.