Magnetic disk device and head positioning method
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorsHiroyuki Suzuki, Hideo Sado
Life of this patent
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Abstract
According to one embodiment, a magnetic disk device includes a disk, a head including a write head configured to write data on the disk, a first read head, and a second read head each configured to read data from the disk, and a controller configured to detect a first error of each track pitch corresponding to each track of the disk on the basis of a first gap in a radial direction between the first read head and the second read head at each position in the radial direction of the disk, write a servo pattern on the disk on the basis of a first correction value used to correct the first error, and position the head on the basis of the servo pattern.
Claims18
A magnetic disk device comprising:
- a disk;
- a head including a write head configured to write data on the disk, a first read head, and a second read head each configured to read data from the disk;
- and
- a controller configured to detect a first error of each track pitch corresponding to each track of the disk on the basis of a first gap in a radial direction between the first read head and the second read head at each position in the radial direction of the disk, write a servo pattern on the disk on the basis of a first correction value used to correct the first error, and position the head on the basis of the servo pattern, wherein
- the controller calculates the first gap on the basis of a first distance between a second position in the radial direction read by the first read head and a third position in the radial direction read by the second read head at the time when the head is positioned at a first position in the radial direction, and a second distance between a fourth position in the radial direction read by the first read head and a fifth position in the radial direction read by the second read head at the time when the head is positioned at the second position in the radial direction.
A head positioning method to be applied to a magnetic disk device comprising a disk, and a head including a write head configured to write data on the disk, a first read head, and a second read head each configured to read data from the disk comprising:
- detecting a first error of each track pitch corresponding to each track of the disk on the basis of a first gap in a radial direction between the first read head and the second read head at each position in the radial direction of the disk;
- writing a servo pattern on the disk on the basis of a first correction value used to correct the first error;
- positioning the head on the basis of the servo pattern;
- and
- calculating the first gap on the basis of a first distance between a second position in the radial direction read by the first read head and a third position in the radial direction read by the second read head at the time when the head is positioned at a first position in the radial direction, and a second distance between a fourth position in the radial direction read by the first read head and a fifth position in the radial direction read by the second read head at the time when the head is positioned at the second position in the radial direction.
Dependencies are inferred from the claim text.