I recently got a Sony-branded PS2 memory card through a trade, and it seems to work fine, but there's one file I can't delete. It's named "Crushed Save Files" and it's apparently from one of those Action Replay thingamajigs.

Well, I deleted everything on the card except for that, and I don't have 8000 or so K available. I have like 7000k. So I'm guessing I have to format the card, but I can't see a way to do so.

I know the Dreamcast had this feature, so it seemed odd that the PS2 does not. Is there a way to wipe the entire card without damaging it or using a third-party tool?