{TAIL ~ a beam supplying unit} for supplying an incident laser beam including data read from a plurality of {HEAD ~ tracks} on a holographic medium 
{ TAIL ~ a beam supplying unit } for supplying an incident laser beam including data read from a plurality of { HEAD ~ tracks } on a holographic medium
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH