ps2 memory cards themselves are not encrypted. ps2 classics' are though. if you're using a ps2 memory card on the ps3, it should be fine. unfortunately, the save may just be corrupted. if it makes you feel any better, my ff1 save on the psp got corrupted somehow over last weekend. I don't know how, but I also took the save from my pstv, and it was still corrupted. in this case, I don't know if it's a bug with Ark or not, because I haven't messed with my psp beyond updating Ark for a very long time. I recently bought one of those memory card adapters for my superslim for use with ps1 memory cards. all cards worked fine except for this one by madcatz. it wouldn't read it at all. it could be third-party garbage or something? it's been like twenty-five years since I've messed with it, but I know playstation memory cards are supposed to last, so it's probably just a cheap card. maybe you're encountering something similar. I have no idea what's going on with the card.
