5 Replies Latest reply: Feb 25, 2010 4:34 AM by Fortuny
Noodle-head Level 3 (680 points)
Can anyone help me with this? I regularly use external USB and Firewire hard drives. It is not uncommon for me to get this message at times when it appears to me that nothing at all is open or in use on a particular drive. Right now I have a 500 GB USB drive plugged in. I shut down every application I was aware of. I cannot think of anything on that drive that is "in use." Like I said, this happens once in a while with different drives and I feel stuck. I have Activity Monitor open and am looking for something obvious but don't know quite what to look for. Disk Utility gives me the same message. Any clues; help?

Mac Pro & Powerbook G4, Mac OS X (10.5.8), Leopard runs on my G4 Powerbook!