I just got my rMBP yesterday with ML installed. I've been using a firewire, 1TB G-Tech external hard drive with absolutely no issues to speak of until now. It it formatted with mac os extended journal. When it is plugged in it takes forever for my computer to restart and often will freeze the system. It has gotten to the point now that I need to wipe the drive because there are so many corrupted files on it. When it isn't plugged in my computer restarts lightning fast and has no issues whatsoever. Clearly it's an issue with communicating to the external, but I know no more than that. Anyone else having similar issues now that they've upgraded to ML?