Zone self servo writing with synchronized parallel clocks
US10832716B2 · kind B2 · utility
3Cited by
9References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 16, 2019 |
| Grant date | Nov 10, 2020 |
| Priority date | — |
| Expiry date | Dec 16, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2020/1284
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Zone self-servo write (SSW) technology is disclosed that leverages two clock signals synchronized in parallel to transition between zones to write servo patterns at different frequencies while minimizing error rate despite the different frequencies. Two separate clock signals (“clocks”) are used to locate and lock to different reference spirals. By updating both clocks in parallel instead of in series, error rate for writing while stepping up frequency across zones is reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.