I'm considering moving from my current Pro Tools set-up to a Logic set-up. PT requires the use of an external hard drive to hold the PT session files. Those of you using Logic, do you keep your files on an external drive, or do you use your Mac's internal hard drive? With internal drive sizes getting as large as they are, I'd definitely have sufficient capacity with most internal drives now. I'd still use an external drive for back-ups, but I'm just curious about this since using the internal drive would make for a much more mobile set-up if using a notebook. Thanks.