GCN MemCard Recover is a utility that can recover files from corrupted or reformatted GameCube memory cards.
Usually, when a GCN memory card is corrupted, only the file system or header is unusable. Similarly, when a memory card is formatted, only the file system blocks are erased. The data area is left intact. By searching for specific patterns within the data area, files can usually be recovered.
http://wiibrew.org/wiki/GCN_MemCard_Recover
