Magnetic disk device and method
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorsKazuyoshi Ueda, Yasuhiro Ishii
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Abstract
According to an embodiment, a magnetic disk device includes a controller that writes data in second tracks with an SMR scheme. The second tracks are continuous in the radial direction of a magnetic disk. The controller calculates a degree of influence of adjacent track interference (ATI) accumulated in first data being data written in the second tracks. The controller executes a first operation in accordance with the degree influence of ATI. The first operation is an operation of rewriting data written in third tracks located on the outermost diameter side or the innermost diameter side among the second tracks, and refraining from rewriting data written in the other tracks.
Claims18
A magnetic disk device comprising:
- a magnetic disk on which first tracks are provided;
- a magnetic head;
- and
- a controller configured to
- write data in second tracks with a shingled magnetic recording (SMR) scheme by using the magnetic head, the second tracks being tracks continuous in a radial direction among the first tracks,
- calculate a degree of influence of adjacent track interference (ATI) accumulated in first data being the data written in the second tracks, and
- execute a first operation in accordance with the degree of influence of ATI, the first operation being an operation of
- rewriting second data out of the first data, the second data being written in third tracks among the second tracks, the third tracks being continuous in the radial direction and located on an outermost diameter side or an innermost diameter side of the second tracks, and
- refraining from rewriting data out of the first data written in fourth tracks, the fourth tracks being tracks continuous in the radial direction and being all tracks other than the third tracks among the second tracks.
A method comprising:
- writing data in second tracks with a shingled magnetic recording (SMR) scheme by using a magnetic head, the second tracks being tracks continuous in a radial direction among first tracks provided on a magnetic disk;
- calculating a degree of influence of adjacent track interference (ATI) accumulated in first data being the data written in the second tracks;
- and
- executing a first operation in accordance with the degree of influence of ATI, the first operation being an operation of
- rewriting second data out of the first data, the second data being written in third tracks among the second tracks, the third tracks being continuous in the radial direction and located on an outermost diameter side or an innermost diameter side of the second tracks, and
- refraining from rewriting data out of the first data written in fourth tracks, the fourth tracks being tracks continuous in the radial direction and being all tracks other than the third tracks among the second tracks.
Dependencies are inferred from the claim text.