Magnetic disk device with enhanced control of write processing method based on shift in dynamic drift off level (ddol)
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorNobuhiro MAETO
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Abstract
According to one embodiment, a magnetic disk device includes a disk, a head configured to write data to the disk and read the data from the disk, and a controller configured to control write processing based on a first determination value corresponding to a first shift amount defined for the excessive number of times at which the first shift amount of the head in a radial direction of the disk exceeds a first threshold value causing a read error in a second track adjacent to a first track in the radial direction at a time of the write processing of the first track of the disk, and a second threshold value changing the write processing.
Claims21
1-19. (canceled)
A magnetic disk device comprising:
- a disk;
- a head configured to write data to the disk and read the data from the disk;
- and
- a controller configured to control write processing based on a first shift amount of the head in a radial direction of the disk at a time of the write processing of a first track of the disk, a first threshold value at which the first shift amount may cause a read error in a second track adjacent to the first track in the radial direction, a first determination value corresponding to the first shift amount, and a second threshold value changing the write processing.
A magnetic disk device comprising:
- a disk;
- a head configured to write data to the disk and read the data from the disk;
- and
- a controller configured to control write processing based on a first shift amount of the head in a radial direction of the disk at a time of the write processing of a first track of the disk, a first threshold value based on a second shift amount of the head in the radial direction at a time of the write processing of a second track adjacent to the first track in the radial direction, a first determination value corresponding to the first shift amount, and a second threshold value changing the write processing.
Dependencies are inferred from the claim text.