Patent ID: 9711172
Date: 2017-07-18
CPC Classifications: G11B

Claim:
1. A magnetic recording device comprising: a disk comprising a band of tracks including a servo region, a first track, and a second track partially overlapping with the first track; a light irradiator configured to irradiate the disk with light and heat the disk with the light; a head comprising a write head configured to write data in a range of the disk irradiated and heated with the light from the light irradiator, and a read head configured to read data from a track in the band of tracks of the disk; and a controller configured to write first data to be used for offset detection in a first region of the band of tracks, read the first data from the first region with reference to servo data in the servo region, detect an offset of the read head based on an amplitude of a first signal of the read first data, and control a position of the read head based on the offset, wherein the controller analyzes the frequency components of the first signal of the first data read from a particular position of the first region, the first signal including a second signal and a third signal having a frequency different from that of the second signal, decomposes the first signal into a second frequency component of the second signal and a third frequency component of the third signal, and detects the offset based on a second amplitude of the second frequency component and a third amplitude of the third frequency component.