I have a 15" MacBook Pro, 2.66 GHz, 7200 rpm, and I bought it less than two months ago. The computer prompted me to reboot in order to finish installing updates, so I just clicked "ok" and it restarted on its own--this was actually the first time I rebooted it since turning it on in the first few days of getting it. I hadn't done any maintenance, but after the devices disappeared, I installed OnyX and went to Parameters > Finder > show hidden files and folders, to see if this would fix the problem, but it didn't. I'll restart again and see what happens...thank you for any help/advice you can give 🙂