Magnetic disk device and control method
AssigneeKabushiki Kaisha Toshiba
InventorAkihiro Harigae
Life of this patent
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Abstract
According to one embodiment, there is provided a magnetic disk device including a magnetic head and a controller. The magnetic head includes a write head and a read head. The controller is configured to measure a difference amount for each of a first track and a second track near the first track on a magnetic disk. The difference amount is a difference between an actual read/write offset and a read/write offset set as an amount corresponding to a distance between the write head and the read head in a cross track direction. The controller is configured to identify a track having an abnormal track pitch based on the measured difference amount.
Claims20
A magnetic disk device comprising:
- a magnetic disk;
- a magnetic head including a write head and a read head;
- and
- a controller configured to obtain a difference amount for each of a first track and a second track near the first track on the magnetic disk, the difference amount being a difference between an actual read/write offset and a predetermined read/write offset, the predetermined read/write offset being set as an amount corresponding to a distance between the write head and the read head in a cross track direction, and to identify a track having an abnormal track pitch based on the obtained difference amount.
A magnetic disk device comprising:
- a magnetic disk including a plurality of tracks;
- and
- a controller configured to perform refresh threshold of processing on a particular track among the plurality of tracks based on a first refresh threshold, a track pitch of the particular track being different from a track pitch of another track among the plurality of tracks, the first refresh threshold being smaller than a second refresh threshold of the another track.
A control method comprising:
- obtaining a difference amount for each of a first track and a second track near the first track on a magnetic disk, the difference amount being a difference between an actual read/write offset and a predetermined read/write offset, the predetermined read/write offset being set as an amount corresponding to a distance between a write head and a read head in a cross track direction;
- and
- identifying a track having an abnormal track pitch based on the obtained difference amount.
Dependencies are inferred from the claim text.