Magnetic disk device and refresh processing method
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorHiroshi ISOKAWA
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Abstract
According to one embodiment, a magnetic disk device includes a disk, a head that writes data to the disk and reads data from the disk, and a controller. The controller is configured to read first data written on the disk, measure a first read error rate of the first data, determine a difference in the first read error rate from a previously determined read error rate of the first data, determine a current read error rate for second data written on the disk based on the difference in the first read error rate from the previously determined read error rate, and determine whether a refresh process is performed on the second data based on the current error rate.
Claims20
A magnetic disk device comprising:
- a disk;
- a head that writes data to the disk and reads data from the disk;
- and
- a controller configured to:
- read first data written on the disk;
- measure a first read error rate of the first data;
- determine a difference in the first read error rate from a previously determined read error rate of the first data;
- based on the difference in the first read error rate from the previously determined read error rate, determine a current read error rate for second data written on the disk;
- and
- based on the current error rate, determine whether a refresh process is performed on the second data.
A magnetic disk device comprising:
- a disk;
- a head that writes data to the disk and reads data from the disk;
- and
- a controller configured to:
- measure a first signal quality of first data written on the disk;
- determine that the first signal quality exceeds a predetermined deterioration threshold value;
- and
- in response, correct a first write count for a first track in which second data is written to a second write count,
- wherein the second write count is based on the first signal quality.
A refresh processing method in a magnetic disk device which includes a disk and a head for writing data to the disk and reading data from the disk, the method comprising:
- measuring a first signal quality of first data written on the disk;
- determining that the first signal quality exceeds a predetermined deterioration threshold value;
- and
- in response, correcting a first write count for a first track in which second data is written to a second write count,
- wherein the second write count is based on the first signal quality.
Dependencies are inferred from the claim text.