Single-sided unipolar device driver for a piezoelectric transducer in a disc drive

This invention relates generally to the field of magnetic data storage devices, and more particularly, but not by way of limitation, to incorporation of a single-sided unipolar piezoelectric transducer driver for a disc drive. A disc drive including a rotatable data track, a dual-stage actuator with a primary actuator motor supporting an actuator arm, a read/write head supported by the actuator arm and communicating with a secondary actuator motor, and steps for controlling range of motion of the secondary actuator motor. The controlling steps include supplying and sustaining a bias signal to a single-sided unipolar device driver that then apply a bias voltage the secondary actuator motor to induce the secondary actuator motor to expand substantially one half of its expansion capabilities. And, confining correction signals provided by a control circuit of the disc drive, used in correcting mechanical position of the secondary actuator motor, to a voltage ranging substantially between a positive "+" and negative "−" voltage substantially equal to the applied bias voltage.