Upon the occurrence of a malfunction in the signal generator, {HEAD ~ operation} of {TAIL ~ the writer} is continued until the next page to be written has not been stored in the buffer memory 
of
Upon the occurrence of a malfunction in the signal generator , { HEAD ~ operation } of { TAIL ~ the writer } is continued until the next page to be written has not been stored in the buffer memory
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH