METHOD AND APPARATUS FOR MODULATING A LASER POWER SIGNAL DURING HEAT-ASSISTED MAGNETIC RECORDING
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United States of America
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Dec 30, 2021
app pub date -
May 18, 2021
filing date -
May 18, 2021
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Abstract
A disk drive apparatus determines a pattern of bits of a data signal applied to a magnetic write transducer of a heat-assisted magnetic recording apparatus. The magnetic write transducer applies a magnetic field to a recording medium in response to the data signal. A laser power signal is applied to a laser that heats the recording medium while the magnetic field is applied. The laser power signal is modulated based on the pattern of bits. The modulation reduces differences between track widths of recorded marks having different elapsed time values and/or increases a signal-to-noise ratio of the recorded marks having different elapsed time values.
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