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US 11,862,213 B2Granted
Magnetic disk device
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 includes a disk that has a track including a first servo sector and a second servo sector that is different from the first servo sector, a head that writes data to the disk and reads data from the disk, and a controller that records first signal strength record data related to a signal strength at which first target servo data that is a target of the first servo sector is read, and standardizes first signal strength data related to a signal strength at which the first target servo data is read when the first target servo data is read.
Claims17
A magnetic disk device comprising:
- a disk that has a track comprising a first servo sector and a second servo sector that is different from the first servo sector;
- a head that writes data to the disk and reads data from the disk;
- and
- a controller that records first signal strength record data related to a signal strength at which first target servo data that is a target of the first servo sector is read, and standardizes first signal strength data related to a signal strength at which the first target servo data is read when the first target servo data is read,
- wherein
- the controller writes the first signal strength record data adjacent to the first servo sector between the first servo sector and the second servo sector arranged next to the first servo sector.
3 more elements
A magnetic disk device comprising:
- a disk that has a track comprising a first servo sector and a second servo sector that is different from the first servo sector;
- a head that writes data to the disk and reads data from the disk;
- and
- a controller that records first signal strength record data related to a signal strength at which first target servo data that is a target of the first servo sector is read, and standardizes first signal strength data related to a signal strength at which the first target servo data is read when the first target servo data is read,
- wherein
- the controller records second signal strength record data related to a signal strength at which second target servo data that is a target of the second servo sector is read, calculates first averaged signal strength record data in which the first signal strength record data and the second signal strength record data are averaged when the first target servo data is read, calculates first averaged signal strength data in which the first signal strength data and the second signal strength data related to a signal strength at which the second target servo data is read are averaged, and standardizes the first averaged signal strength data to first averaged standardized data based on the first averaged signal strength record data.
3 more elements
A magnetic disk device comprising:
- a disk that has a track comprising a first servo sector and a second servo sector that is different from the first servo sector;
- a head that writes data to the disk and reads data from the disk;
- and
- a controller that records first signal strength record data related to a signal strength at which first target servo data that is a target of the first servo sector is read, and standardizes first signal strength data related to a signal strength at which the first target servo data is read when the first target servo data is read,
- wherein
- the controller records second signal strength record data related to a signal strength at which second target servo data that is a target of the second servo sector is read, standardizes the first signal strength data to first standardized data based on the first signal strength record data when the first target servo data is read, standardizes, to second standardized data, second signal strength data related to a signal strength at which the second target servo data is read based on the second signal strength record data when the second target servo data is read, and calculates first averaged standardized data at which the first standardized data and the second standardized data are averaged.
3 more elements
A magnetic disk device comprising:
- a disk that has a track comprising a first servo sector and a second servo sector that is different from the first servo sector;
- a head that writes data to the disk and reads data from the disk;
- and
- a controller that records first signal strength record data related to a signal strength at which first target servo data that is a target of the first servo sector is read, and standardizes first signal strength data related to a signal strength at which the first target servo data is read when the first target servo data is read,
- wherein
- the head has a first read head and a second read head that read data from the disk, and
- when the first target servo data is read by the first read head and the second read head, the controller calculates first averaged signal strength record data in which the first signal strength record data in which the first target servo data is read by the first read head and second signal strength record data related to a signal strength at which the first target servo data is read by the second read head are averaged, calculates first averaged signal strength data in which the first signal strength data read from the first target servo data by the first read head and second signal strength data related to a signal strength read from the first target servo data by the second read head are averaged, and standardizes the first averaged signal strength data to first averaged standardized data based on the first averaged signal strength record data.
4 more elements
Dependencies are inferred from the claim text.