Patent ID: 6898041

Claim:
A disk drive comprising: a spindle motor which rotates a disk medium; an actuator motor which drives an actuator mounted with a head for performing data read/write on the disk medium; a first motor control device which drives the spindle motor at a rated rotation number by supplying a first current; a second motor control device which drives the actuator motor by supplying a second current; a current sensor which senses a current consumption amount of the spindle motor; and a controller which performs control to restrict an amount of the second current according to an increase in the first current such that the total amount of the first and second currents does not exceed a maximum current capacity set in the disk drive and including the first current amount and the second current amount, the controller performing control to restrict the second current amount so as not to exceed a residual current capacity, the residual current capacity being obtained by subtracting the first current amount from the maximum current capacity, according to a sensing result from the current sensor, when the first current amount exceeds a specified value required to achieve the rated rotation number.