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