Just bought a 1TB external drive! I came down to 0 Kilobytes available last night so today I bought a western digital elements SE external for $90.99 at target. I just partitioned 350GB for Time Machine and the other 650GB is for Media and such. The 350GB Time machine portion isn't going to effect the other half right? I just want to make sure it doesn't like format all my media once I drop it all on the 650GB half...thanks in advance.