GC Memory card issues (Corrrupted)

[Trojans05]

Even with the most current build (4.0-5995) I still can't seem to get it to work. It looks the same as on the picture. How would I go about exporting it "without using witchcraft?" I have a feeling that since nothing shows up when I select the memory card (in the picture, the "corrupted" memory card is slot B), it probably isn't there anymore. I just wasn't sure how it could disappear like that.