On the Mac keyboard there are 2 USB ports, I have my mouse in 1 of those ports and nothing in the other. I tried to put a card reader in the port and got an error that it is drawing too much power and is being deactivated. My question is this: Why would apple even bother putting 2 USB ports on the keyboard if they are too weak to run anything but a mouse? My iPod Mini dock, or scanner can't use it either. What a waste of a USB port IMO.