| 摘要 |
PROBLEM TO BE SOLVED: To accurately control spacing between a head and a disk medium. SOLUTION: A level peak-acquiring unit 802 acquires a peak of a signal level during a calibration wherein a heater power is increased from zero to a predetermined power. A sample acquiring unit 803 acquires in a sampling range, a sample of a combination of the heater power and the signal level. A linear function-determining unit 804 determines a linear function that approximates from the sample, a relation between the heater power and the signal level. Based on the peak of the signal level and the linear function, a control Touch Down Point (TDP)-calculating unit 805 calculates the heater power corresponding to the peak of the signal level and treats the calculated heater power as a control touchdown point. Then, the control TDP-calculating unit 805 uses the control touchdown point to convert into a linear function, of the heater power and spacing, the linear function of the heater power and the signal level. COPYRIGHT: (C)2008,JPO&INPIT
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