Actually, I don't think that fsck_msdos is Linux at all - it's osX, from BSD. The linux fsck commands would be just fsck with a -t parameter if it doesn't detect the file system, or fsck.msdos or, (for FAT32) fsck.vfat. Not to say that those could have handled your card any better, but it'd be vaguely interesting to try (not interesting enough to re-reformat and then find someone w/a linux machine). Besides, it's always fun to get in a little Apple bashing, even if only sideways.