| 摘要 |
In a head loading/unloading type disk apparatus, accurate velocity feedback control is implemented by correcting any error in a VCM velocity detection value, which is caused by a temperature change or the like. At the start of loading control for loading a head (102) from a ramp onto a disk (101), a carriage (103) is pushed against an outer-periphery stopper to set the actual velocity of a VCM (105) to zero. In this state, a VCM velocity detection value detected by a VCM velocity detection circuit (108) is read out. On the basis of this velocity detection value, calibration for correcting the relationship between the VCM current value and the VCM velocity detection value is performed. In the period of head positioning control after the loading, an operation using a timer (115) is periodically performed in which the carriage (103) is pushed against an inner-periphery stopper, the calibration is reexecuted, and the head (102) is returned to the original head position. |
