| 摘要 |
According to one embodiment, a measuring module measures the dynamic flying height of a head. A change calculation module calculates a change DeltaDFHPt in a reference power optimal for setting a first dynamic flying height, based on the difference between a second dynamic flying height, which has a value measured by the measuring module while the reference power is being supplied to a adjusting element, and the first dynamic flying height. A controller changes the power to be supplied to the adjusting element, by the change DeltaDFHPt calculated by the change calculation module.
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