Magnetic disk apparatus and method
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorNobuhiro Maeto
Life of this patent
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Abstract
According to an embodiment, tracks on a magnetic disk each include a long-distance sector having a length in the circumferential direction covering two or more servo sectors. A controller executes an acquisition operation to acquire one or more evaluation amounts on the basis of a track pitch in each of the two or more servo sectors included in a portion adjacent to the long-distance sector. The controller executes a protection operation to protect data of an adjacent track in a case where a total value of the one or more evaluation amounts exceeds a first threshold value.
Claims20
A magnetic disk apparatus comprising:
- a magnetic disk on which multiple tracks are provided, the multiple tracks each including multiple servo sectors in which servo information is recorded, the multiple servo sectors being arranged at intervals in a circumferential direction, the multiple tracks each including multiple long-distance sectors, each of the multiple long-distance sectors being a region to which data is written, the region having a length in the circumferential direction covering two or more of the multiple servo sectors;
- a magnetic head that executes data writing and data reading to and from each of the multiple long-distance sectors;
- and
- a controller that executes an acquisition operation and a protection operation in a write operation to a first portion of a first track being one of the multiple tracks, the first portion being adjacent to one long-distance sector in a second track adjacent to the first track,
- the acquisition operation being executed to acquire one or more evaluation amounts corresponding to a squeeze amount of a track pitch based on a set value of the track pitch on the basis of the track pitch in each of two or more first servo sectors, the two or more first servo sectors being two or more servo sectors included in a range between two ends in the circumferential direction of the first portion,
- the protection operation being executed to protect data of the second track in a case where a first total value exceeds a first threshold value, the first total value being a total value of the one or more evaluation amounts.
A method of controlling a magnetic disk apparatus including a magnetic disk on which multiple tracks are provided, the multiple tracks each including multiple servo sectors in which servo information is recorded, the multiple servo sectors being arranged at intervals in a circumferential direction, the multiple tracks each including multiple long-distance sectors, each of the multiple long-distance sectors being a region to which data is written, the region having a length in the circumferential direction covering two or more of the multiple servo sectors, the method comprising:
- in a write operation to a first portion of a first track being one of the multiple tracks, the first portion being adjacent to one long-distance sector in a second track adjacent to the first track,
- executing an acquisition operation to acquire one or more evaluation amounts corresponding to a squeeze amount of a track pitch based on a set value of the track pitch on the basis of the track pitch in each of two or more first servo sectors, the two or more first servo sectors being two or more servo sectors included in a range between two ends in the circumferential direction of the first portion;
- and
- executing a protection operation to protect data of the second track in a case where a first total value exceeds a first threshold value, the first total value being a total value of the one or more evaluation amounts.
Dependencies are inferred from the claim text.