I just picked up a new 15" MBP and did a clean install on my old one for my GF. I also picked up an Airport Extreme dual band. I have 3 drives hooked up to it via USB hub. The new MBP actually mounts the drives and places them on the desktop after accessing them. The old MBP can access the drives through finder and even runs backups through TimeMachine but does not mount the drives and put them on the desktop. Any ideas why that would be?