Thus increase {HEAD ~ the speed} of {TAIL ~ data reading}, and avoid repeatedly turning on and off the disk drive motor 
of
Thus increase { HEAD ~ the speed } of { TAIL ~ data reading } , and avoid repeatedly turning on and off the disk drive motor
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH