Fault tolerant memory system which utilizes {HEAD ~ data} from {TAIL ~ a shadow memory device} upon the detection of erroneous data in a main memory device 
Fault tolerant memory system which utilizes { HEAD ~ data } from { TAIL ~ a shadow memory device } upon the detection of erroneous data in a main memory device
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH