The present invention relates to 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 {HEAD ~ a holographic medium} while the disk is rotating during {TAIL ~ playback} 
The present invention relates to 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 { HEAD ~ a holographic medium } while the disk is rotating during { TAIL ~ playback }
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