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US 11,735,221 B2Granted
Magnetic disk device and method of changing recording mode
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorYusuke Tomoda
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 to the disk, and an assist element that generates energy to enhance write performance by the write head, and a controller that selects and performs a first recording mode and a second recording mode different from the first recording mode, and selects and performs one of the first recording mode and the second recording mode according to an assist effect of the assist element.
Claims16
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 to the disk, and an assist element that generates energy to enhance write performance by the write head;
- and
- a controller that selects and performs a first recording mode and a second recording mode different from the first recording mode, and selects and performs one of the first recording mode and the second recording mode according to an assist effect of the assist element, wherein
- the first recording mode is a conventional magnetic recording in which a track is written at an interval in a radial direction of the disk,
- the second recording mode is a shingled write magnetic recording in which a track is written in an overlapping manner in the radial direction,
- the controller selects and performs one of the first recording mode and the second recording mode according to an error rate corresponding to the head, and
- the controller performs the second recording mode when determining that the error rate is larger than a first threshold indicating a sign of deterioration of the assist element.
5 more elements
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 to the disk, and an assist element that generates energy to enhance write performance by the write head;
- and
- a controller that selects and performs a first recording mode and a second recording mode different from the first recording mode, and selects and performs one of the first recording mode and the second recording mode according to an assist effect of the assist element, wherein
- the first recording mode is a conventional magnetic recording in which a track is written at an interval in a radial direction of the disk,
- the second recording mode is a shingled write magnetic recording in which a track is written in an overlapping manner in the radial direction, and
- the controller selects and performs one of the first recording mode and the second recording mode according to a resistance value of the assist element.
4 more elements
A magnetic disk device comprising:
- a disk having a first surface including a first media cache and a first user data region and a second surface different from the first surface, the second surface including a second media cache and a second user data region;
- a first head having a first read head that reads data from the first surface, a first write head that writes data to the first surface, and a first assist element that generates energy to enhance write performance with the first write head;
- a second head having a second read head that reads data from the second surface, a second write head that writes data to the second surface, and a second assist element that generates energy to enhance write performance with the second write head;
- and
- a controller that temporarily writes first data to the second surface with the second head when the first head writes the first data to the first surface.
2 more elements
A magnetic disk device comprising:
- a disk having a first surface including a first media cache and a first user data region and a second surface different from the first surface, the second surface including a second media cache and a second user data region;
- a first head having a first read head that reads data from the first surface, a first write head that writes data to the first surface, and a first assist element that generates energy to enhance write performance by the first write head;
- a second head having a second read head that reads data from the second surface, a second write head that writes data to the second surface, and a second assist element that generates energy to enhance write performance with the second write head;
- and
- a controller that refreshingly writes data written on the first surface with the first head by a shingled recording mode, to the second surface with the second head by a conventional recording mode, or refreshingly writes data written on the second surface with the second head by a conventional recording mode, to the first surface with the first head by a shingled recording mode.
2 more elements
Dependencies are inferred from the claim text.