In the past I've dealt with 2gb memory sticks and by formatting them to FAT, instead of the normal FAT32, my Iso's of PsP games have worked perfectly with little to no lag. Recently I've been dealing with a 4gb memory stick and it plays choppy unformated to FAT, but my problem is I can't format it to FAT. Is there a way to format it like the 2gb or am I screwed? Thanks.