Since {TAIL ~ only four parameters} are needed to specify the input signal, the signal is easy to construct, and it thus practical for {HEAD ~ use} in high density disk drive applications 
Since { TAIL ~ only four parameters } are needed to specify the input signal , the signal is easy to construct , and it thus practical for { HEAD ~ use } in high density disk drive applications
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH