THERMAL COMPENSATION FOR LASER IN HEAT ASSISTED MAGNETIC RECORDING

摘要

A storage medium controller has been designed to maintain thermal stability of a heat source based on a history of heat source active/inactive durations so that a variation in spot size generated by the heat source is reduced during heat assisted magnetic recording (HAMR). The storage medium controller modulates power to the heat source based on these active/inactive durations. While the heat source is inactive, the storage medium controller increases a thermal compensation value and, after the heat source is activated, the storage medium controller drives the heat source according to a current parameter proportional to the thermal compensation value. As the heat source is continuously operated, the storage medium controller decreases the thermal compensation value and the proportional current parameter so that thermal stability of the heat source is maintained.;COPYRIGHT KIPO 2020