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US 11,600,292 B1Granted
Magnetic disk device
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorsTakuya Matsumoto, Yusuke Tomoda
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Abstract
According to one embodiment, a magnetic disk device comprises a magnetic disk, a magnetic head, a monitoring unit, and a control unit. When carrying out write of data to a first track, if an absolute difference between a light output monitored by the monitoring unit at the time of write and a light output monitored last time by the monitoring unit exceeds a predetermined value, the control unit controls a position of a write head and writes data again to the first track or a second track one track before the first track.
Claims6
A magnetic disk device comprising:
- a magnetic disk;
- a magnetic head including a write head which writes data to the magnetic disk, a thermal assist unit which assists the write head in write of data by using a near-field optical element, and a read head which reads data from the magnetic disk;
- a monitoring unit which monitors a light output;
- and
- a control unit which controls read of data from the magnetic disk to be carried out by the magnetic head and write of data to the magnetic disk according to a shingled magnetic recording system, wherein
- when carrying out write of data to a first track, if an absolute difference between a light output monitored by the monitoring unit at the time of write and a light output monitored last time by the monitoring unit exceeds a predetermined value, the control unit controls a position of the write head and writes data again to the first track or a second track one track before the first track.
3 more elements
Dependencies are inferred from the claim text.