Multitrack servo marks with perpendicular and longitudinal magnetic fields
US10332557B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 13, 2018 |
| Grant date | Jun 25, 2019 |
| Priority date | — |
| Expiry date | Sep 13, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2020/1281
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A servo sector on a disk is read via first and second readers that both span two or more user data tracks. The servo sector has a crosstrack width that spans the two or more user data tracks. The first reader provides a first signal based on detecting a total longitudinal field of the servo sector. The second reader provides a second signal based on detecting a total perpendicular field of the servo sector. A position error of the first and second readers is detected using. A value of the first signal can be used to detect a position error, detect a track-to-track phase error, and/or detect a Gray code error of a track ID field of the servo sector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.