| 摘要 |
A disk drive (10) with a disk (12) and an actuator assembly (16) on which a communication device (14) is mounted for communication with the disk (12). Position information read from the disk is processed through a channel (21) that generates a digital position error signal by a first signal converter (41). Based on the digital position error signal, a controller (44) determines whether realignment of the communication device (14) with the disk (12) is required. When realignment is required, a digital position control signal is generated by the controller and is converted to an analog position control signal by a second signal converter (43). The first and second signal converters share DAC (42) as common circuitry. Operation of the DAC (42) is switched between the first and second signal converters by a switch (48) by controller (44). Based on the analog position control signal, a servo system (46) causes the actuator assembly (16) to reposition the communication device (14) for fine adjustment to maintain proper alignment with the disk (12).
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