US 2025/0104736 A1 · MAGNETIC RECORDING AND REPRODUCING DEVICE AND ADJUSTMENT METHOD OF THE SAME

Abstract

According to one embodiment, a method of adjusting a magnetic recording and reproducing device is a method of adjusting a magnetic recording and reproducing device incorporating a heat-assisted magnetic recording head and a magnetic disk, and the method includes performing a first write operation at a first position on a recording surface, measuring a first error rate at a second position different in radial position from the first position, performing a second write operation and then measuring a second error rate, obtaining a first difference between the first error rate and the second error rate, measuring a third error rate at the first position, performing a third write operation and then measuring a fourth error rate, calculating a second difference between the third error rate and the fourth error rate, comparing the first difference with the second difference and determining a change in flying height.

Claims18

Dependent claims

A method of adjusting a magnetic recording and reproducing device incorporating a heat-assisted magnetic recording head and a magnetic disk, the method comprising:

performing a first write operation by the heat-assisted magnetic recording head, at a first position on a recording surface of the magnetic disk;
seeking the heat-assisted magnetic recording head to a second position different in radial position from the first position on the recording surface, and measuring a first error rate;
performing a second write operation at the second position and then measuring a second error rate at the second position;
calculating a first difference between the first error rate and the second error rate;
seeking the heat-assisted magnetic recording head to the first position and measuring a third error rate;
performing a third write operation at the first position and then measuring a fourth error rate at the first position;
calculating a second difference between the third error rate and the fourth error rate;
and
comparing the first difference with the second difference and determining a change in flying height between the first position and the second position.

6 more elements

A magnetic recording and reproducing device comprising:

a magnetic disk including a magnetic recording layer and a lubricant provided on a recording surface of the magnetic recording layer;
a heat-assisted magnetic recording head performing magnetic recording on the magnetic disk;
a head position controller arranging the heat-assisted magnetic recording head at a first position on the recording surface or a second position different in radial position from the first position;
a write operation controller controlling each of a first write operation at the first position, a second write operation at the second position, and a third write operation at the first position;
an error rate measurement unit measuring a first error rate before the second write operation, a second error rate after the second write operation, a third error rate before the third write operation, and a fourth error rate after the third write operation;
a calculator calculating each of a first difference between the first error rate and the second error rate and a second difference between the third error rate and the fourth error rate;
and
a determination unit comparing the first difference with the second difference and determining a change in flying height.

5 more elements

Dependencies are inferred from the claim text.

Magnetic recording and reproducing device and adjustment method of the same

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Magnetic recording and reproducing device and adjustment method of the same

Life of this patent

Abstract

Claims18