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