Magnetic disk device and correction method of head position
AssigneeKabushiki Kaisha Toshiba
InventorNaoki Tagami
Life of this patent
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Abstract
According to one embodiment, a magnetic disk drive in the present embodiment includes a disk including tracks, each including servo sectors, a head, and a controller configured to acquire first correction data for repeatable runout occurring in a first direction, and second correction data different from the first correction data, to write the first correction data within a first permitted range in the first direction, to write the second correction data within a write permitted range including the first permitted range and a second permitted range in a second direction opposite to the first direction, to read at least one of the first correction data and the second correction data, and to correctly place the head.
Claims20
A magnetic disk drive comprising:
- a disk comprising tracks, each comprising a track center and servo sectors;
- a head configured to write data to the disk and read data from the disk;
- and
- a controller configured to acquire first correction data for repeatable runout occurring at one of the tracks and deviating from the track center in a first direction, and second correction data for repeatable runout different from the first correction data, to write the first correction data within a first permitted range including the track center and extending from the track center in the first direction, to write the second correction data within a write permitted range including the first permitted range and a second permitted range including the track center and extending from the track center in a second direction opposite to the first direction, to read at least one of the first correction data and the second correction data, and to correctly place the head within the write permitted range.
A head position correcting method applied to a magnetic disk drive including a disk comprising tracks, each comprising a track center and servo sectors, and a head configured to write data to the disk and read data from the disk, comprising:
- acquiring first correction data for repeatable runout occurring at one of the tracks and deviating from the track center in a first direction, and second correction data for repeatable runout different from the first correction data;
- writing the first correction data within a first permitted range including the track center and extending from the track center in the first direction,
- writing the second correction data within a write permitted range including the first permitted range and a second permitted range including the track center and extending from the track center in a second direction opposite to the first direction;
- reading at least one of the first correction data and the second correction data;
- and
- makes corrections to locate the head within the write permitted range.
Dependencies are inferred from the claim text.