DISK DRIVE DEVICE AND SERVO CONTROL METHOD THEREOF

摘要

PROBLEM TO BE SOLVED: To perform appropriate servo control in accordance with detected vibration in a disk drive device having a vibration sensor. SOLUTION: In an embodiment of the present invention, an HDD switches a correction servo mode to perform vibration correction in head positioning and a normal servo mode not to perform the vibration correction. The HDD performs servo positioning in either one of the servo modes and determines servo positioning accuracy in the servo mode from the measured positional error signal. The HDD obtains data indicating the servo positioning accuracy in the other servo mode from a table. The HDD compares the accuracy in the two servo modes and selects the servo mode with higher accuracy. The table contains previous measurements on servo positioning accuracy in each of the servo modes. COPYRIGHT: (C)2009,JPO&INPIT