| 摘要 |
PROBLEM TO BE SOLVED: To precisely control clearance between a head and a disk according to pressure without using any barometric sensor. SOLUTION: In an embodiment of the present invention, an HDD determines a clearance from variations in operational parameters, and further determines a variation in pressure by deducting the clearance variation caused by a variation in temperature from the clearance. When the HDD controls the clearance according to the pressure change, the HDD checks for head-disk contact. The accuracy and reliability in pressure measurement (clearance measurement) using operational parameters are not high. Therefore, confirming the pressure measurement by the presence or absence of head-disk contact eliminates head-disk contact in the following read/write operation to attain a secure margin for the clearance. COPYRIGHT: (C)2009,JPO&INPIT
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