Method for self-servowriting timing propagation
US6429989B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 13, 2000 |
| Grant date | Aug 6, 2002 |
| Priority date | — |
| Expiry date | Aug 9, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for writing timing marks on a rotatable storage medium, such as on a disk in a disk drive, includes the steps of: 1) during a rotation of the disk, detecting the passage of at least a portion of a first timing mark located at a radial trajectory at a first radius of the disk, and 2) during the same rotation of the disk, writing a second timing mark at a second radius of the disk. The second timing mark is located at least one of a) where at least a portion of the second timing mark overlaps at least a portion of the radial trajectory of the first timing mark, and b) where the second timing mark is in close proximity to the radial trajectory of the first timing mark. The second timing mark is written based on different parameters such as a measured time interval, a calculated time interval, and a predetermined delay.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.