I've got 2 external drives. 1 Buffalo 1TB 5400 RPM ext drive that I'm using for backup with Time Machine. I quess I'll leave that one hooked up and running ? 1 MyDigital 480GB SSD ext drive for my videos. Do I leave this one hooked up and running or unplugged and plug it in only when I need to access the Videos ? Sorry for the newbie dumb question but I'm a newbie and that's how I'm rolling Thanks in advance !!!