A disk drive apparatus that performs a positioning of a head based on servo information recorded on a recording medium includes a servo control unit that performs a servo control based on a set of pieces of servo information selected from a plurality of sets of pieces of servo information recorded on the recording medium.

 
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< Magnetic sensing element having no variation in track width and capable of properly complying with track narrowing

> Magnetoresistive film with nickel iron alloy soft magnetic layer having face and body-centered cubic lattice crystals

> Concurrent data recording and reproducing method, seek operation control method and magnetic disk drive using the methods
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