Each of the primary memory blocks has a laser fuse that will disable the associated primary memory block and enable the replacement memory block such that the total amount of logical memory in {HEAD ~ the memory device} is unaffected by {TAIL ~ a defective primary block} 
Each of the primary memory blocks has a laser fuse that will disable the associated primary memory block and enable the replacement memory block such that the total amount of logical memory in { HEAD ~ the memory device } is unaffected by { TAIL ~ a defective primary block }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL