{HEAD ~ The present invention} relates to a holographic digital data storage system; and, more particularly, to {TAIL ~ an apparatus} and method for controlling tracking and focusing of a laser beam on a disk of a holographic medium while the disk is rotating during playback 
{ HEAD ~ The present invention } relates to a holographic digital data storage system ; and , more particularly , to { TAIL ~ an apparatus } and method for controlling tracking and focusing of a laser beam on a disk of a holographic medium while the disk is rotating during playback
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