The volatile data storage stores controller state data during {HEAD ~ operation} of {TAIL ~ the memory system} 
of
The volatile data storage stores controller state data during { HEAD ~ operation } of { TAIL ~ the memory system }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL