Measuring transition shifts due to laser power variation in a heat-assisted magnetic recording device
US9818447B1 · kind B1 · utility
8Cited by
7References
20Claims
0Family size
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Key dates
| Filing date | Mar 21, 2017 |
| Grant date | Nov 14, 2017 |
| Priority date | — |
| Expiry date | Mar 21, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0021
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method comprises writing a waveform on a magnetic recording medium using a heat-assisted magnetic recording apparatus which includes a laser. The method also comprises reading back the waveform from the medium, and detecting one or more transition shifts in the readback waveform indicative of a mode hop of the laser. The method further comprises measuring a metric of the one or more transition shifts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.