Magnetic disk device and control method of the same
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorTakahiro MAGOME
Life of this patent
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Abstract
According to one embodiment, a magnetic disk device detects a first optimal fly amount, estimates a first optimal fly amount distribution, obtains a movable distance and an optimal moving speed of a magnetic head, detects a second optimal fly amount, moves the magnetic head to a plurality of movement positions specified based on the movable distance and the optimal moving speed while sequentially positioning thereat, and writes a plurality of spiral servo patterns to a magnetic disk while controlling the amount of protrusion of the magnetic head so that the spacing between the magnetic head at each of the movement positions and the magnetic disk becomes the first and second optimal fly amounts.
Claims8
A magnetic disk device comprising:
- a magnetic disk;
- a magnetic head movable with respect to the magnetic disk and projecting toward the magnetic disk, which can adjust an amount of protrusion thereof;
- and
- a controller which controls movement of the magnetic head and the amount of protrusion of the magnetic head,
- wherein
- the controller is configured to:
- detect a first optimal fly amount, which is an optimal spacing between a predetermined position on the magnetic disk and the magnetic head;
- estimate, based on the first optimal fly amount, a first optimal fly amount distribution, which is an optimal spacing between the magnetic head at each of a plurality of movement positions of the magnetic head and the magnetic disk;
- obtain a movable distance and an optimal moving speed of the magnetic head by moving the magnetic head while controlling the amount of protrusion of the magnetic head so that the spacing between the magnetic head and the magnetic disk follows along the first optimal fly amount distribution;
- detect a second optimal fly amount, which is an optimal spacing between the magnetic head at each of the movement positions and the magnetic disk while sequentially positioning the magnetic head to a plurality of movement positions specified based on the movable distance and the optimal moving speed;
- and
- move the magnetic head to a plurality of movement positions specified based on the movable distance and the optimal moving speed while sequentially positioning thereat, and write a plurality of spiral servo patterns to the magnetic disk by the magnetic head while controlling the amount of protrusion of the magnetic head so that the spacing between the magnetic head at each of the movement positions and the magnetic disk becomes the first optimal fly amount and each of the second optimal fly amounts.
A method for controlling a magnetic disk device comprising:
- a magnetic disk;
- a magnetic head movable with respect to the magnetic disk and projecting towards the magnetic disk, which can change an amount of projection thereof;
- and
- a controller which controls movement of the magnetic head and the amount of protrusion of the magnetic head,
- the method comprising:
- detecting a first optimal fly amount, which is an optimal spacing between a predetermined position on the magnetic disk and the magnetic head;
- estimating, based on the first optimal fly amount, a first optimal fly amount distribution, which is an optimal spacing between the magnetic head at each of a plurality of movement positions and the magnetic disk;
- obtaining a movable distance and an optimal moving speed of the magnetic head by moving the magnetic head while controlling an amount of protrusion of the magnetic head so that a spacing between the magnetic head and the magnetic disk follows along the first optimal fly amount distribution;
- detecting each of second optimal fly amounts, which is an optimal spacing between the magnetic head at each of the movement positions and the magnetic disk while sequentially positioning the magnetic head to a plurality of movement positions specified based on the movable distance and the optimal moving speed;
- and
- moving the magnetic head to a plurality of movement positions while sequentially positioning the magnetic head to a plurality of movement positions specified based on the movable distance and the optimal moving speed and writing a plurality of spiral servo patterns to the magnetic disk by the magnetic head while controlling the amount of protrusion of the magnetic head so that the spacing between the magnetic head and the magnetic disk at each of the movement positions becomes each respective one of the first optimal fly amount and the second optimal fly.
Dependencies are inferred from the claim text.