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