Magnetic disk device and write processing method
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorsNobuhiro Maeto, Akihiko Takeo
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Abstract
According to one embodiment, a magnetic disk device includes a disk, a head for writing data to the disk and reading data from the disk, and a controller configured to detect a positioning error of the head as the head is writing the data in a first track of the disk, and change a first threshold value for interrupting the writing based on one or more evaluation values corresponding to a possibility of correcting error data in the first track of the disk. The controller interrupts the writing when detecting the positioning error of the head writing the first track that exceeds the first threshold value.
Claims16
A magnetic disk device comprising:
- a disk;
- a head for writing data to the disk and reading data from the disk;
- and
- a controller configured to
- detect a positioning error of the head as the head is writing the data in a first track of the disk, and
- change a first threshold value for interrupting the writing from a first value to a second value smaller than the first value based on one or more evaluation values corresponding to a possibility of correcting error data in the first track of the disk and including:
- a sum of amounts by which positioning errors exceed the second value, and
- a number of the positioning errors, wherein
- the controller interrupts the writing when detecting the positioning error of the head writing the first track that exceeds the first threshold value.
A method performed by a magnetic disk device having a disk and a head for writing data to the disk and reading data from the disk, the method comprising:
- detecting a positioning error of the head as the head is writing the data in a first track of the disk;
- changing a first threshold value for interrupting the writing from a first value to a second value smaller than the first value based on one or more evaluation values corresponding to a possibility of correcting error data in the first track of the disk and including:
- a sum of amounts by which positioning errors exceed the second value, and
- a number of the positioning errors;
- and
- interrupting the writing when detecting the positioning error of the head writing the first track that exceeds the first threshold value.
A magnetic disk device comprising:
- a disk;
- a head for writing data to the disk and reading data from the disk;
- a memory that stores
- a first threshold value of a positioning error of the head for interrupting the writing and
- at least one of a sum of amounts by which positioning errors exceed a second threshold value and the number of the positioning errors;
- and
- a controller configured to
- control the head to write data in a track of the disk,
- detect a positioning error of the head as the head is writing the data in the track,
- based on the positioning error, update the one of the sum and the number of the positioning errors, and
- update the first threshold value according to the updated one of the sum and the number of the positioning errors.
Dependencies are inferred from the claim text.