In seek control for a head of a rotary recorder/reproducer, the seek time
is reduced with noise reduced while utilizing a driving force of an
actuator effectively. In one embodiment, when a microprocessor generates
a control signal for a drive current given to an actuator for head seek,
a signal generator generates a prespecified acceleration allowing for the
allowable maximum acceleration when the actuator is accelerated, a
prespecified deceleration signal allowing for the allowable maximum
deceleration when the actuator is decelerated, and a zero level signal
when the actuator is settled. Switching from deceleration to settling is
performed at a point of time computed by the microprocessor as a time
point when settling is to be started so that the head may reach a target
position within the shortest period of time.