Apparatus and method for controlling tracking and focusing {HEAD ~ servo} in {TAIL ~ a holographic digital data storage system} 
Apparatus and method for controlling tracking and focusing { HEAD ~ servo } in { TAIL ~ a holographic digital data storage system }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL