Laser calibration for heat-assisted magnetic recording head using interleaved laser current
US10083716B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 16, 2017 |
| Grant date | Sep 25, 2018 |
| Priority date | — |
| Expiry date | Aug 16, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2020/1232
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A heat-assisted magnetic recording head is moved relative to a magnetic recording medium. The medium comprises a plurality of sectors. The sectors define a plurality of sector groups distributed around a circumference of the medium. The sectors of each sector group are written using different operational currents supplied to a laser diode of the head such that at least one sector from each sector group is written using one of the different operational currents. For each of the different operational currents, an average write performance metric is calculated for all sectors written at each of the different operational currents. A particular operational current of the different operational currents is determined that results in a best average write performance metric.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.