| 摘要 |
According to one embodiment, a disk device comprises a magnetic head module, a measurement module, and an arithmetic operation module. The magnetic head module includes a read head and a write head wherein an offset is present therebetween. The measurement module writes a measurement signal into a disk medium, reads the measurement signal while moving the read head in the radial direction, and obtains a measurement value of the offset based on a level of the read measurement signal. The arithmetic operation module obtains an estimate value of a distance between the write head and the read head based on a design value of the distance, a design value of the offset calculated by the design value of the distance, and the measurement value of the offset.
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