4.0 is actually to battle the future, although I feel the future up I may have changed the hardware. Play the game, everyday life buy this is in the village to fly the plane, the new machine can buy, but really, nothing cost-effective, 3.0 enough, the need for 4.0, long ago the price of cabbage. Also do not need to entangle tlc, mlc or something, now this hard drive capacity, really does not affect the previous 60g of 500 times erase only 30t concern there is still a need, now 1t of 500 times erase, erase 50g per day also have to use 10,000 days, almost 30 years, there is no need to consider this