these cards are fake. You try loading up 3gb of info on them. And use it for a while. After a while they error out and you have to format them again. I believe these are 2gb cards that are made to report as 4gb as anything above 2gb makes these cards start acting wonky. If you format them in Vista you actually get errors. I bought mine off ebay from this guy called pc2buy. He is definately running a scam