Not sure what happened this morning, but I'll try to explain. I have an external 1TB OWC firewire drive for audio. I also have aUSB bootable clone from my old 13" MBP. I want to reuse this drive to clone my new MBP, but I wanted to back up all the files first just in case. So temporarily, I was going to just select ALL, and copy the entire drive to a folder on my 1TB audio drive. Just so I'd have the stuff. Just used Finder to do the copy. But a few minutes in to it. Maybe it was 15 minutes. I'm not sure. I canceled it. I didn't want to commit to copying it over just yet. I had some work to do. So I then deleted the temporary folder I had on my audio drive. Now here's where the problem starts... I have on my firewire, first my M-Audio ProFire audio interface, then the OWC 1TB drive chained to that. It's been working great since I got this new MBP on Wed. No problems. After I tried that copy, now 9 out of 10 times, I can't boot properly if the OWC is on while I'm booting. What I get is a long boot time, followed by a washed out looking desktop. A mouse pointer is there, but I can't actually click on anything. If I shut off the OWC drive it unmounts, and the desktop goes to normal. If I boot with the OWC turned off, it boots fine. And when I turn it on after I'm booted, it mounts normally. But I can't boot with it already powered on. Could I have copied some boot record files over or something to the OWC drive, and the MBP is getting messed up booting because it doesn't know where to boot from? And if so, can I check to see if there is boot info on there, and is there a way to delete it? When I go into Disk Utility, and click Info for the OWC drive, it say "Bootable: YES".