Laser adjustment during field operation of a heat-assisted magnetic recording data storage device

摘要

During field operation of a heat-assisted magnetic recording data storage device, a laser adjustment procedure is performed. The laser adjustment procedure involves writing on a recording medium at least three tracks. If a bit error rate of a middle tracks has increased, the laser current is swept while recording test tracks to determine a new laser current that results in a minimum bit error rate. The new laser current is used for subsequent write operations.

主权项

1. A method, comprising:
energizing a near-field transducer with a laser during field operation of a heat-assisted magnetic recording data storage device; detecting an event during the field operation that indicates a possible change in the near-field transducer performance; in response to the event, performing a laser adjustment procedure comprising:
writing, via the near-field transducer on a recording medium of the data storage device, at least three test tracks;in response to determining an increase in bit-error-rate of a middle track of the at least three test tracks, sweeping the laser current while recording additional test tracks to determine a new laser current that results in a target bit error rate; andusing the new laser current for subsequent write operations.