Multiple head control using common and differential position error signals
US9311940B1 · kind B1 · utility
5Cited by
3References
20Claims
0Family size
Assignee
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Key dates
| Filing date | Jul 28, 2015 |
| Grant date | Apr 12, 2016 |
| Priority date | — |
| Expiry date | Jul 28, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59627
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
First and second position error signals (PES) are measured from respective first and second read heads that are simultaneously reading two different surfaces of a recording medium. A common repeatable runout (RRO) compensation signal and a differential RRO signal are determined based on the first and second PES. A voice coil motor that drives the first and second read heads is adjusted using the common RRO compensation signal, and first and second microactuators that respectively position the first and second read heads are adjusted based on the differential RRO signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.