Patent ID: 9355671
Filing Date: 2016-05-31
CPC Classification: G11B

Claim Text:
1. A method comprising: measuring a temperature; measuring laser output power of a laser in a heat assisted magnetic recording device; determining a power error by subtracting an optimal laser output power from the measured laser output power; comparing the power error to at least one threshold to determine whether an applied current to the laser needs to be adjusted, wherein the at least one threshold is related to how great the power error can be while maintaining the integrity of data on a recording medium; adjusting the applied laser input current to the laser as a function of the power error and the measured temperature when the power error is greater than a first threshold, wherein adjusting the applied laser input current to the laser includes accessing a relationship amongst temperature, applied laser input current and laser output current; and recharacterizing the relationship amongst temperature, applied laser input current and laser output power when the power error is greater than a second threshold that is different from the first threshold.