like I said from day 1, these cards fail once u put them under headvy use, my 2gb card never once "crashed" or lost its partition once, with the 4gigs its a routine occurence. So backup your data consistently if you want peace of mind and want the luxury of 4gb

PS: this problem has nothing to do with what programs you are running of the card. I tried it with mp3s only and it "crashed" a few days later requiring a full format yet again. So the whole "this program crashed the card" argument is really not valid, you just happened to be using that program when the card decided to pack up