Magnetic disk drive and write offset correction method therein
AssigneeToshiba Storage Device Corporation
InventorMichinaga Yamagishi
Life of this patent
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Abstract
According to one embodiment, a magnetic disk drive uses a patterned medium on which data tracks having a recording layer and grooves having no recording layer as a disk. The magnetic disk drive includes a correction unit which corrects the head center position of a write head so that a head edge portion on the side to which the top edge of the write head is tilted falls within or substantially falls within a groove on the side to which the top edge of the write head is tilted.
Claims12
A magnetic disk drive comprising:
- a disk comprising a patterned medium, the patterned medium comprising grooves and data tracks comprising a recording layer;
- an adjustment module configured to adjust a head center position of a write head in such a manner that a head edge portion on a side to which a top edge of the write head is tilted upon changing a yaw angle falls within a groove on the side to which the top edge of the write head is tilted;
- and
- a write head position controller configured to control a write head position based on the adjustment.
A magnetic disk drive comprising:
- a disk comprising a patterned medium, the patterned medium comprising grooves and data tracks comprising a recording layer;
- an offset storage module configured to store an offset used for setting a head edge portion on a side to which a top edge of a write head is tilted substantially within a groove on the side to which the top edge of the write head is tilted on a reference track;
- an adjustment module configured to calculate a write offset position of a current track by accumulating track pitches between neighboring tracks from the reference track to the current track to a write offset position of the reference track to which the offset is added;
- and
- a write head position controller configured to control a write head position based on the adjustment.
A write offset correction method of controlling a write head position in a magnetic disk drive comprising a disk comprising a patterned medium comprising grooves and data tracks comprising a recording layer, the method comprising:
- adjusting a head center position of a write head in such a manner that a head edge portion on a side to which a top edge of the write head is tilted upon changing a yaw angle as an angle a tangential direction of the disk in order to adjust the write head substantially within a groove on the side to which the top edge of the write head is tilted;
- and
- controlling the write head position based on the adjustment.
A write offset correction method of controlling a write head position in a magnetic disk drive comprising a disk comprising a patterned medium comprising data tracks comprising grooves and a recording layer, the method comprising:
- calculating a write offset position of a current track by accumulating track pitches between neighboring tracks from a reference track to the current track to a write offset position of the reference track to which an offset used for set a head edge portion on a side to which a top edge of a write head is tilted substantially within a groove on the side to which the top edge of the write head is tilted on the reference track is added;
- and
- controlling a write head position based on the calculation.
Dependencies are inferred from the claim text.