a voice coil motor for a moving storage media actuator has a permanent magnet assembly wherein a radially polarized magnet is formed as sectors , with like sectors of the outer housing which forms a portion of the pole piece assembly . these sectors are then mounted on the remainder of the pole piece assembly for the magnetic actuator to form a cylindrical magnet and cylindrical outer pole piece . the sectors require no further attachment or adhesive in addition to the magnetic field and provides substantially zero clearance contact between magnet and pole piece , to afford a continuous magnetic path interrupted only by the working gap through which the voice coil travels .