Laser adjustment during field operation of a heat-assisted magnetic recording data storage device
US9311951B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 2015 |
| Grant date | Apr 12, 2016 |
| Priority date | — |
| Expiry date | Sep 24, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0021
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
During field operation of a heat-assisted magnetic recording data storage device, a laser adjustment procedure is repeatedly performed. The laser adjustment procedure involves writing, at a designated location on a recording medium at least three tracks at an unsqueezed pitch, a first track being in the middle of the at least three tracks. A first bit error rate of the first track is compared with a reference bit error rate. In response to the comparison satisfying a threshold, the laser current is swept while recording squeezed test tracks at the designated location to determine a new laser current that results in a minimum bit error rate. The new laser current is used for subsequent write operations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.