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 {HEAD ~ the total amount} of logical memory in the memory device is unaffected by {TAIL ~ a defective primary block} 
is unaffected by
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 { HEAD ~ the total amount } of logical memory in 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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL