The data blocks are error checked by an error check unit and the number of {TAIL ~ erroneous data blocks} is stored in {HEAD ~ memory} 
The data blocks are error checked by an error check unit and the number of { TAIL ~ erroneous data blocks } is stored in { HEAD ~ memory }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD