means for conveying {TAIL ~ data} to said input means for {HEAD ~ storage} and for receiving stored data from said output means during read/write operations 
means for conveying { TAIL ~ data } to said input means for { HEAD ~ storage } and for receiving stored data from said output means during read / write operations
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH