Magnetic disk device and rewrite processing method
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorsYusuke Tomoda, Akihiko Takeo
Life of this patent
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Abstract
According to one embodiment, a magnetic disk device includes a disk having a first region in which a plurality of tracks is written and a second region that is positioned with a gap in a first direction of the radial direction of the first region, and in which a plurality of tracks is overwritten in the first direction, a head, and a controller that offsets part of a plurality of tracks which is overwritten in the second region in a second direction opposite the first direction to perform rewriting.
Claims18
A magnetic disk device comprising:
- a disk having a first region in which a plurality of tracks is written from a first initial track located at a first end in a radial direction to a first last track located at a first other end opposite the first end in the radial direction and a second region that is positioned with a gap in a first direction of the radial direction of the first region, and in which a plurality of tracks is overwritten in the first direction from a second initial track located at a second end in the radial direction to a second last track located at a second other end opposite the second end in the radial direction;
- a head that writes data to the disk and that reads data from the disk;
- and
- a controller that offsets part of a plurality of tracks which is overwritten in the second region in a second direction opposite the first direction to perform rewriting;
- when rewriting part or all of data in the second initial track, the controller offsets the second initial track from a first position to a second position away from the first position by a first interval in the second direction to perform rewriting.
A magnetic disk device comprising:
- a disk having a first region in which a plurality of tracks is written from a first initial track located at a first end in a radial direction to a first last track located at a first other end opposite the first end in the radial direction and a second region that is positioned with a gap in a first direction of the radial direction of the first region, and in which a plurality of tracks is overwritten in the first direction from a second initial track located at a second end in the radial direction to a second last track located at a second other end opposite the second end in the radial direction;
- a head that writes data to the disk and that reads data from the disk;
- and
- a controller that offsets part of a plurality of tracks which is overwritten in the second region in a second direction opposite the first direction to perform rewriting;
- when rewriting first data in the second region, the controller offsets a plurality of tracks which is continuously overwritten in the first direction from the second initial track to a first track including the first data by a first interval in the second direction to perform rewriting.
A magnetic disk device comprising:
- a disk having a first region in which a plurality of tracks is written from a first initial track located at a first end in a radial direction to a first last track located at a first other end opposite the first end in the radial direction and a second region that is positioned with a gap in a first direction of the radial direction of the first region, and in which a plurality of tracks is overwritten in the first direction from a second initial track located at a second end in the radial direction to a second last track located at a second other end opposite the second end in the radial direction;
- a head that writes data to the disk and that reads data from the disk;
- and
- a controller that offsets part of a plurality of tracks which is overwritten in the second region in a second direction opposite the first direction to perform rewriting;
- when the number of times of first writing that data is written in the first region exceeds a threshold value corresponding to the second region, the controller offsets the second initial track from a first position to a second position away from the first position by a first interval in the second direction to perform rewriting.
A magnetic disk device comprising:
- a disk having a first region in which a plurality of tracks is written from a first initial track located at a first end in a radial direction to a first last track located at a first other end opposite the first end in the radial direction and a second region that is positioned with a gap in a first direction of the radial direction of the first region, and in which a plurality of tracks is overwritten in the first direction from a second initial track located at a second end in the radial direction to a second last track located at a second other end opposite the second end in the radial direction;
- a head that writes data to the disk and that reads data from the disk;
- and
- a controller that offsets part of a plurality of tracks which is overwritten in the second region in a second direction opposite the first direction to perform rewriting;
- when the number of times of first writing that data is written to a first last track in the first region exceeds a threshold value corresponding to the second region, the controller offsets the second initial track from a first position to a second position away from the first position by a first interval in the second direction to perform rewriting.
A magnetic disk device comprising:
- a disk having a first region in which a plurality of tracks is written from a first initial track located at a first end in a radial direction to a first last track located at a first other end opposite the first end in the radial direction and a second region that is positioned with a gap in a first direction of the radial direction of the first region, and in which a plurality of tracks is overwritten in the first direction from a second initial track located at a second end in the radial direction to a second last track located at a second other end opposite the second end in the radial direction;
- a head that writes data to the disk and that reads data from the disk;
- and
- a controller that offsets part of a plurality of tracks which is overwritten in the second region in a second direction opposite the first direction to perform rewriting;
- when the number of times of first writing that data is written to the first region exceeds a threshold value corresponding to the second region, the controller offsets a plurality of track which is continuously overwritten in the first direction from the second initial track by a first interval in the second direction to perform rewriting.
A magnetic disk device comprising:
- a disk having a first region in which a plurality of tracks is written from a first initial track located at a first end in a radial direction to a first last track located at a first other end opposite the first end in the radial direction and a second region that is positioned with a gap in a first direction of the radial direction of the first region, and in which a plurality of tracks is overwritten in the first direction from a second initial track located at a second end in the radial direction to a second last track located at a second other end opposite the second end in the radial direction;
- a head that writes data to the disk and that reads data from the disk;
- and
- a controller that offsets part of a plurality of tracks which is overwritten in the second region in a second direction opposite the first direction to perform rewriting;
- when the number of times of first writing that data is written to a first last track in the first region exceeds a threshold value corresponding to the second region, the controller offsets a plurality of track which is continuously overwritten in the first direction from the second initial track by a first interval in the second direction to perform rewriting.
A rewrite processing method applied to a magnetic disk device including a disk having a first region in which a plurality of tracks is written from a first initial track located at a first end in a radial direction to a first last track located at a first other end opposite the first end in the radial direction and a second region that is positioned with a gap in a first direction of the radial direction of the first region, and in which a plurality of tracks is overwritten in the first direction from a second initial track located at a second end in the radial direction to a second last track located at a second other end opposite the second end in the radial direction, the method comprising
- offsetting part of a plurality of tracks that is overwritten in the second region in a second direction opposite the first direction to perform rewriting;
- and
- when rewriting part or all of data in the second initial track, offsetting the second initial track from a first position to a second position away from the first position by a first interval in the second direction to perform rewriting.
A rewrite processing method applied to a magnetic disk device including a disk having a first region in which a plurality of tracks is written from a first initial track located at a first end in a radial direction to a first last track located at a first other end opposite the first end in the radial direction and a second region that is positioned with a gap in a first direction of the radial direction of the first region, and in which a plurality of tracks is overwritten in the first direction from a second initial track located at a second end in the radial direction to a second last track located at a second other end opposite the second end in the radial direction, the method comprising
- offsetting part of a plurality of tracks that is overwritten in the second region in a second direction opposite the first direction to perform rewriting;
- and
- when rewriting first data in the second region, offsetting a plurality of tracks which is continuously overwritten in the first direction from the second initial track to a first track including the first data by a first interval in the second direction to perform rewriting.
A rewrite processing method applied to a magnetic disk device including a disk having a first region in which a plurality of tracks is written from a first initial track located at a first end in a radial direction to a first last track located at a first other end opposite the first end in the radial direction and a second region that is positioned with a gap in a first direction of the radial direction of the first region, and in which a plurality of tracks is overwritten in the first direction from a second initial track located at a second end in the radial direction to a second last track located at a second other end opposite the second end in the radial direction, the method comprising
- offsetting part of a plurality of tracks that is overwritten in the second region in a second direction opposite the first direction to perform rewriting;
- and
- when the number of times of first writing that data is written in the first region exceeds a threshold value corresponding to the second region, offsetting the second initial track from a first position to a second position away from the first position by a first interval in the second direction to perform rewriting.
A rewrite processing method applied to a magnetic disk device including a disk having a first region in which a plurality of tracks is written from a first initial track located at a first end in a radial direction to a first last track located at a first other end opposite the first end in the radial direction and a second region that is positioned with a gap in a first direction of the radial direction of the first region, and in which a plurality of tracks is overwritten in the first direction from a second initial track located at a second end in the radial direction to a second last track located at a second other end opposite the second end in the radial direction, the method comprising
- offsetting part of a plurality of tracks that is overwritten in the second region in a second direction opposite the first direction to perform rewriting;
- and
- when the number of times of first writing that data is written to a first last track in the first region exceeds a threshold value corresponding to the second region, offsetting the second initial track from a first position to a second position away from the first position by a first interval in the second direction to perform rewriting.
A rewrite processing method applied to a magnetic disk device including a disk having a first region in which a plurality of tracks is written from a first initial track located at a first end in a radial direction to a first last track located at a first other end opposite the first end in the radial direction and a second region that is positioned with a gap in a first direction of the radial direction of the first region, and in which a plurality of tracks is overwritten in the first direction from a second initial track located at a second end in the radial direction to a second last track located at a second other end opposite the second end in the radial direction, the method comprising
- offsetting part of a plurality of tracks that is overwritten in the second region in a second direction opposite the first direction to perform rewriting;
- and
- when the number of times of first writing that data is written to the first region exceeds a threshold value corresponding to the second region, offsetting a plurality of track which is continuously overwritten in the first direction from the second initial track by a first interval in the second direction to perform rewriting.
A rewrite processing method applied to a magnetic disk device including a disk having a first region in which a plurality of tracks is written from a first initial track located at a first end in a radial direction to a first last track located at a first other end opposite the first end in the radial direction and a second region that is positioned with a gap in a first direction of the radial direction of the first region, and in which a plurality of tracks is overwritten in the first direction from a second initial track located at a second end in the radial direction to a second last track located at a second other end opposite the second end in the radial direction, the method comprising
- offsetting part of a plurality of tracks that is overwritten in the second region in a second direction opposite the first direction to perform rewriting;
- and
- when the number of times of first writing that data is written to a first last track in the first region exceeds a threshold value corresponding to the second region, offsetting a plurality of track which is continuously overwritten in the first direction from the second initial track by a first interval in the second direction to perform rewriting.
Dependencies are inferred from the claim text.