Hello, I have a 1TB drive with a bunch of movies/tb on it (not full or anything but a little over half, ripped my collection for my atv). But i'm sick of having to have it plugged in all the time etc. since my laptop moves around. I was wondering if 2.5" externals are as reliable as 3.5" externals that need a power cord? Definitely in terms of 500 and 1tb drives. I also want to use one for backup as well for my mba.