So I'm basically set on getting a riMac in a few months but until then i'm still using my Dell Laptop which is almost full to the brim so I thought about maybe getting a 2TB external passport drive which I could shift the bulk of the 500gb of data that currently resides on my laptop hard drive over to and any other files that accumulate between now and when I get my rImac. So my question(s) is what steps do I need to take to make sure that my hard drive is good to go when my rImac arrives? because i'd love to just plug it in and have most of my stuff there but a friend has told me it's a very complicated procedure and that nothing i've saved on my external hard drive will show up on Mac OS due to the formatting but having read online it seems if I formated the drive as exFat that I should be ok but i'm still not sure. I'm asking as with most people i'm going to go with a pure 256gb SSD option so won't have anything but programs and software installed internally so practically all my movies/music/photos etc will be held externally. Any help is welcome.