Laser mode hopping detection method and apparatus for a heat-assisted magnetic recording device
US9792949B1 · kind B1 · utility
5Cited by
4References
20Claims
0Family size
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Key dates
| Filing date | Jan 24, 2017 |
| Grant date | Oct 17, 2017 |
| Priority date | — |
| Expiry date | Jan 24, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0021
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus and method provide for performing, using a heat-assisted magnetic recording head, multiple sequential writes to a recording medium, and recording a metric of write performance for each of the writes. The apparatus and method further provide for calculating fluctuations in the metric, detecting whether the head has a laser mode hopping problem using the metric fluctuations, and categorizing a severity of the laser mode hopping problem.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.