Quote Originally Posted by DavidEccleston View Post
Why move? If you copy then delete, Macs are annoying in that they keep the files on the card in a trash folder, so your card ends up remaining full. That would be fine, except you can't empty trashes per drive, only all drives at once, and what if you don't want to empty your main trash? You're stuck. It's kinda stupid, but usually not a big deal. If you're adventurous, you can remove the files with the command line instead, which will remove them without moving to trash.
I just copy them. I always format every card when I put it in a camera, every time. It’s a good practice, and necessary if you have >1 camera model and move cards between them.