Hi, I'm looking to upgrade my HD for my macbook. External lacks a bit of portability, but as long as its bus powered, it's fine. Internal would be great, but I have a few questions.. With an internal HD: 1. Will my MB have less battery time? 2. Will my MB run hotter? 3. Will it be louder? With an external HD: 1. I'm sure I'll have less battery time, but, is the battery time comparable to having a 7200 rpm 320GB internal HD? 2. What do you recommend? I'd go straight for the internal HD, but I already feel the battery life is somewhat short even with the stock HD it came with. With an external HD, I could unplug when I'm not using it.