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