Then the system reads {HEAD ~ the data} in {TAIL ~ all the sectors} of the disk with a reading routine, and saves the data in the free memory space 
in
Then the system reads { HEAD ~ the data } in { TAIL ~ all the sectors } of the disk with a reading routine , and saves the data in the free memory space
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH