How can I delete corrupt data from my PS2 8MB memory card?

So, I've been playing FFXII for a while now. 114 hours, to be exact. I'm right at the end of the story basically. Lately, due to a family situation, I've been spending a lot of time at my boyfriend's house. So, we copied my file to his memory card so that I'd be able to play while I was over there.

That night, after he had copied my file, I tried to play my game at home using my memory card. The game starts up, I open the Load Screen, and it says it can't read my memory card. So I check on the browser, and a file (not the file I'd been using, thank goodness) is missing and now there's this block of corrupted data of an unidentified size. And I can't delete it.

I checked it and all of the other files for other games still work. It's just Final Fantasy XII, which leads me to believe that one of the files has now become this corrupted data.

Is there anyway to delete it? Or will I have to buy a new memory card just to play FFXII?
 
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