摘要 |
PROBLEM TO BE SOLVED: To provide a disk memory device wherein a useful and stable runout measurement function is achieved. SOLUTION: The disk drive which makes the head 10 move along a target orbit on the disk 1 by servo control includes a microprocessor 14 which calculates, as a runout, a virtual target orbit value supplied to the feedback controller to suppress a disturbance at the target orbit when measuring the runout of the disk 1, and which has a gain adjustment function to multiply the virtual target orbit value by a gain preset. COPYRIGHT: (C)2011,JPO&INPIT
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