On an optical disc player, a mechanism which keeps the read/write head on a particular track, added to compensate for any minor distortions or defects in the disc surface, or any vibrations caused by the drive's motor.
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On an optical disc player, a mechanism which keeps the read/write head on a particular track, added to compensate for any minor distortions or defects in the disc surface, or any vibrations caused by the drive's motor.