From what I have seen the available spare value will decrease rapidly near end of life. As Flash cells start to fail they are replaced by spare. Because of wri

From what I have seen the available spare value will decrease rapidly near end of life. As Flash cells start to fail they are replaced by spare. Because of write leveling this is delayed for a while, but then as each cell reaches its 300 or 3,000 writes, they all start to fail.