Determining thermal gradient of a HAMR hotspot using pseudo-random bit sequences recorded at a stepped laser power
US10339963B1 · kind B1 · utility
5Cited by
7References
20Claims
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Key dates
| Filing date | Jul 2, 2018 |
| Grant date | Jul 2, 2019 |
| Priority date | — |
| Expiry date | Jul 2, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0021
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Pseudorandom bit sequences are recorded to a heat-assisted recording medium at a laser power that is stepped while recording the pseudorandom bit sequences. The pseudorandom bit sequences are read from the heat-assisted recording medium to determine timing differences between bits written before and after the laser power is stepped. A thermal gradient of bits written to the heat-assisted recording medium is determined based on the timing differences.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.