{HEAD ~ The present invention} relates to {TAIL ~ a holographic digital data storage system}; and, more particularly, to 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 
relates to
{ HEAD ~ The present invention } relates to { TAIL ~ a holographic digital data storage system } ; and , more particularly , to 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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