Magnetic disk apparatus and method
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorWataru Tsukahara
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Abstract
According to embodiments, a magnetic disk apparatus includes a magnetic disk, a magnetic head, a temperature sensor, and a controller. The magnetic disk has formed therein a servo sector in which servo data including a first post code and a second post code is recorded. In the positioning of the magnetic head, the controller performs a correction using a third post code that is based on the first and second post codes and a first temperature detected by the temperature sensor.
Claims14
A magnetic disk apparatus comprising:
- a magnetic disk in which is formed a servo sector in which servo data including a first post code and a second post code is recorded;
- a magnetic head;
- a temperature sensor;
- and
- a controller that performs, in positioning of the magnetic head, a correction by using a third post code that is based on the first post code, the second post code, and a first temperature detected by the temperature sensor, wherein
- the controller stores a second temperature that is a temperature of the magnetic disk apparatus observed when the first post code and the second post code were generated, and obtains the third post code based on the first post code, the second post code, and a magnitude of a difference between the first temperature and the second temperature.
A magnetic disk apparatus comprising:
- a magnetic disk in which is formed a servo sector in which servo data including a first post code and a second post code is recorded;
- a magnetic head;
- a temperature sensor;
- and
- a controller that performs, in positioning of the magnetic head, a correction by using a third post code that is based on the first post code, the second post code, and a first temperature detected by the temperature sensor, wherein
- the controller obtains the third post code based on the first post code, the second post code, the first temperature detected by the temperature sensor, and a number of re-executions of writing to or reading from the magnetic disk.
A magnetic disk apparatus comprising:
- a magnetic disk in which is formed a servo sector in which servo data including a first post code and a second post code is recorded;
- a magnetic head;
- a temperature sensor;
- and
- a controller that performs, in positioning of the magnetic head, a correction by using a third post code that is based on the first post code, the second post code, and a first temperature detected by the temperature sensor, wherein
- the controller stores a second temperature that is a temperature of the magnetic disk apparatus observed when the first post code and the second post code were generated, and obtains the third post code based on the first post code, the second post code, a magnitude of a difference between the first temperature and the second temperature, and a number of re-executions of writing to or reading from the magnetic disk.
A method for positioning within a magnetic disk apparatus, the method comprising:
- positioning a magnetic head on a magnetic disk in which is formed a servo sector in which servo data including a first post code and a second post code is recorded, wherein
- the positioning includes performing a correction by using a third post code that is based on the first post code, the second post code, and a first temperature detected by a temperature sensor, wherein
- the method further comprising:
- storing a second temperature that is a temperature of the magnetic disk apparatus observed when the first post code and the second post code were generated;
- and
- obtaining the third post code based on the first post code, the second post code, and a magnitude of a difference between the first temperature and the second temperature.
Dependencies are inferred from the claim text.