Patent ID: 8139307

Claim:
A method of controlling a flying height of a magnetic head of a hard disk drive apparatus, the method comprising: determining whether a difference between a measured flying height of the magnetic head measured by applying a burn-in FOD (flying on demand) voltage corresponding to a target flying height of a reference FOD voltage profile defining a relationship between the flying height of the magnetic head and the FOD voltage by which an end of the magnetic head thermally expands and thus protrudes, to a heater included in the magnetic head, and a burn-in flying height of the reference FOD voltage profile corresponding to the burn-in FOD voltage exceeds a preset reference; calculating a corrected FOD voltage for the target flying height by performing a touch down test of the magnetic head with respect to a disk, when the difference between the measured flying height of the magnetic head and the burn-in flying height exceeds the preset reference; and controlling a flying height of the magnetic head by applying the corrected FOD voltage.