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US 12,308,055 B2Granted
Magnetic disk device
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorNobuhiro Maeto
Life of this patent
Estimating the term…
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.
Claims13
A magnetic disk device comprising:
- a disk that includes a track including a first servo sector and a second servo sector that is different from the first servo sector;
- a head that includes a write head that writes data to the disk, and a first read head and a second read head that read data from the disk;
- and
- a controller that calculates first signal strength data related to a signal strength at which first target servo data that is a target of the first servo sector is read by the first read head, calculates second signal strength data related to a signal strength at which the first target servo is read by the second read head, and calculates first averaged signal strength data in which the first signal strength data and the second signal strength data are averaged,
- wherein
- the controller records first averaged signal strength record data related to the first averaged signal strength data, and calculates first standardized data by standardizing based on the first averaged signal strength record data when the first averaged signal strength data is calculated.
3 more elements
A magnetic disk device comprising:
- a disk that includes a track including a first servo sector and a second servo sector that is different from the first servo sector;
- a head that includes a write head that writes data to the disk, and a first read head and a second read head that read data from the disk;
- and
- a controller that calculates first signal strength data related to a signal strength at which first target servo data that is a target of the first servo sector is read by the first read head, calculates second signal strength data related to a signal strength at which the first target servo is read by the second read head, and calculates first averaged signal strength data in which the first signal strength data and the second signal strength data are averaged,
- wherein
- the first signal strength data are values obtained by performing Fourier transform of a reproduction signal when the first target servo data is read.
3 more elements
A magnetic disk device comprising:
- a disk that includes a track including a first servo sector and a second servo sector that is different from the first servo sector;
- a head that includes a write head that writes data to the disk, and a first read head and a second read head that read data from the disk;
- and
- a controller that calculates first signal strength data related to a signal strength at which first target servo data that is a target of the first servo sector is read by the first read head, calculates second signal strength data related to a signal strength at which the first target servo is read by the second read head, and calculates first averaged signal strength data in which the first signal strength data and the second signal strength data are averaged,
- wherein
- the first signal strength data are values obtained by performing Fourier transform on and dividing a reproduction signal and an ideal signal or a demodulated signal when the first target servo data is read.
3 more elements
A magnetic disk device comprising:
- a disk that includes a track including a first servo sector and a second servo sector that is different from the first servo sector;
- a head that includes a write head that writes data to the disk, and a first read head and a second read head that read data from the disk;
- and
- a controller that calculates first signal strength data related to a signal strength at which first target servo data that is a target of the first servo sector is read by the first read head, calculates second signal strength data related to a signal strength at which the first target servo is read by the second read head, and calculates first averaged signal strength data in which the first signal strength data and the second signal strength data are averaged,
- wherein
- the first signal strength data are amplitude of a reproduction signal when the first target servo data is read.
3 more elements
A magnetic disk device comprising:
- a nonvolatile memory;
- 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,
- 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 to the nonvolatile memory, 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.
1 more element
Dependencies are inferred from the claim text.