| 摘要 |
According to one embodiment, in a disk drive having a disk medium that has a plurality of sectors, in each of which servo data containing a servo-burst patterns is recorded, a CPU calculates the reliability value of a sector to be evaluated, from a ratio of the sum of the servo-burst values acquired from the sector, to a value obtained by performing low-pass filtering operation on the sum acquired at the time of detection or acquired for the immediately preceding sample. The CPU then determines whether the sector is a defective sector having defective servo-burst patterns, on the basis of the reliability value thus calculated.
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