Okay. I can't copy to it from Thunar, but I'm not getting any errors. I was just checking it, because several of my SD cards became corrupted and I'm starting to become paranoid. I might post about my experience later.
So to transfer I would type:
cp -r (folder a) (folder B)
to get folder a in folder b?
EDIT: I meant folder b in parenthesis but it was auto formatted to a smiley.