Magnetic disk device and method of setting data format
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorHiroshi Isokawa
Life of this patent
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Abstract
According to one embodiment, a magnetic disk device includes a disk, a head including a read head that reads data from the disk, a write head that writes data into the disk, and an assist element that generates energy for improving write performance of the write head, and a controller that adjusts a degauss condition after a stop of a write process of the write head, based on a resistance value of the assist element, and adjusts a data format of the disk in accordance with the degauss condition, the resistance value being measured after data is written into the disk, and the write process having an influence on the resistance value.
Claims20
A magnetic disk device comprising:
- a disk;
- a head including a read head that reads data from the disk, a write head that writes data into the disk, and an assist element that generates energy for improving write performance of the write head;
- and
- a controller that adjusts a degauss condition after a stop of a write process of the write head, based on a resistance value of the assist element, and adjusts a data format of the disk in accordance with the degauss condition, the resistance value being measured after data is written into the disk, and the write process having an influence on the resistance value.
A magnetic disk device comprising:
- a first disk including a first surface having first user data, first servo data, and a first region between the first user data and the first servo data;
- a second disk including a second surface having second user data, second servo data, and a second region that is provided between the second user data and the second servo data and has a size different from a size of the first region;
- a first head including a first read head that reads data from the first surface, a first write head that writes data into the first surface, and a first assist element that generates energy for improving write performance of the first write head;
- a second head including a second read head that reads data from the second surface, a second write head that writes data into the second surface, and a second assist element that generates energy for improving write performance of the second write head;
- and
- a controller that sets a second degauss condition after a stop of a write process of the second write head, the second degauss condition being different from a first degauss condition after a stop of the write process of the first write head.
A method of setting a data format, which is applied to a magnetic disk device including a disk, and a head including a read head that reads data from the disk, a write head that writes data into the disk, and an assist element that generates energy for improving write performance of the write head, the method comprising:
- adjusting a degauss condition after a stop of a write process of the write head, based on a resistance value of the assist element, the resistance value being measured after data is written into the disk, and the write process having an influence on the resistance value;
- and
- adjusting a data format of the disk in accordance with the degauss condition.
Dependencies are inferred from the claim text.