Magnetic disk device and DOL setting method
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorNobuhiro Maeto
Life of this patent
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Abstract
According to one embodiment, a magnetic disk device including a disk, a head which writes data to the disk and reads data from the disk, and a controller which sets a first DOL for a first sector group and a second DOL for a second sector group to different values, the first sector group including one or more first sectors and a first parity sector, the first sectors which allow an error correction process to be performed for each track based on the first parity sector, and are continuously arranged in a circumferential direction of the disk from the first parity sector, the second sector group including one or more second sectors which allow no error correction process to be performed for each track, and are continuously arranged in the circumferential direction.
Claims14
A magnetic disk device comprising:
- a disk;
- a head which writes data to the disk and reads data from the disk;
- and
- a controller which sets a first DOL for a first sector group and a second DOL for a second sector group to different values,
- the first sector group including one or more first sectors and a first parity sector,
- the first sectors which allow an error correction process to be performed for each track based on the first parity sector, and are continuously arranged in a circumferential direction of the disk from the first parity sector, and
- the second sector group including one or more second sectors which allow no error correction process to be performed for each track, and are continuously arranged in the circumferential direction.
A magnetic disk device comprising:
- a disk;
- a head which writes data to the disk and reads data from the disk;
- and
- a controller including a table which manages a first sector group and a second sector group;
- the first sector group including one or more first sectors and a first parity sector,
- the first sectors which allow an error correction process to be performed for each track based on the first parity sector, and are continuously arranged in a circumferential direction of the disk from the first parity sector, and
- the second sector group including one or more second sectors which allow no error correction process to be performed for each track, and are continuously arranged in the circumferential direction.
A magnetic disk device comprising:
- a disk;
- a head which writes data to the disk and reads data from the disk;
- and
- a controller including a table which manages a third sector group which causes a read error when a first sector group is changed to a second sector group;
- the first sector group including one or more first sectors and a first parity sector,
- the first sectors which allow an error correction process to be performed for each track based on the first parity sector, and are continuously arranged in a circumferential direction of the disk from the first parity sector, and
- the second sector group including one or more second sectors which allow no error correction process to be performed for each track, and are continuously arranged in the circumferential direction.
A magnetic disk device comprising:
- a disk including a first area;
- a head which writes data to the disk and reads data from the disk;
- and
- a controller which temporarily saves data in a first recording area other than the first area and inhibit a write process from being performed for the first area, when receiving a write command to change to a first sector group;
- and
- the first sector group including one or more first sectors which does not permit a write process in which an error cannot be corrected for each track, and are continuously arranged in the circumferential direction of the disk.
A magnetic disk device comprising:
- a disk including a first area;
- a head which writes data to the disk and reads data from the disk;
- and
- a controller which temporarily saves a third sector group corresponding to the first write command in a first recording area other than the first area and inhibit a write process of the third sector group from being performed for the first area, when receiving a first write command to change from a first sector group to a second sector group;
- the first sector group including one or more first sectors and a first parity sector,
- the first sectors which allow an error correction process to be performed for each track based on the first parity sector, and are continuously arranged in a circumferential direction of the disk from the first parity sector, and
- the second sector group including one or more second sectors which allow no error correction process to be performed for each track, and are continuously arranged in the circumferential direction.
A method of setting a DOL, which is applied to a magnetic disk device including a disk and a head which writes data to the disk and reads data from the disk,
- the method comprising setting a first DOL for a first sector group and a second DOL for a second sector group to different values,
- the first sector group including one or more first sectors and a first parity sector,
- the first sectors which allow an error correction process to be performed for each track based on the first parity sector, and are continuously arranged in a circumferential direction of the disk from the first parity sector, and
- the second sector group including one or more second sectors which allow no error correction process to be performed for each track, and are continuously arranged in the circumferential direction.
Dependencies are inferred from the claim text.