Thus, when a host command comes from host 12, host interface 26 restores {HEAD ~ power} to {TAIL ~ the storage device} 10 
to
Thus , when a host command comes from host 12 , host interface 26 restores { HEAD ~ power } to { TAIL ~ the storage device } 10
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH