A high density optical storage system (12) employing a laser beam for reading data in a track (17) on a rotating optical disk (15) containing a large number of concentric tracks (17). Track following is provided using a galvanometer-controlled mirror (40) in the path of the beam which is angularly deflected during track following in response to detected track deviations, whereby the beam is controlled to accurately follow the track (17). Provision is also made for detecting the angular position of the mirror (40). A linear motor (48) responsive to the detected angular position moves the mirror (40) in a direction which reduces the deflection required to be provided by the mirror (40) in order to maintain the beam accurately following the track (17). The mirror (40) is also controlled in response to the rate of change of the linear motor (48) velocity for providing greater system stability.
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