I have some questions about upgrading the hard drive in a White MacBook. 1. If I do it my-self will it void my warranty? I notice that the MBP manual has instructions for replacing the hard drive, but the MacBook does not. Am I correct to assume that Apple doesn't consider the HD user replaceable in the MacBook, and it would void the warranty? If so I'll just stick the original 160 back in if I ever have to get it serviced. 2. Is there much of a difference in battery life if I were to put a 7200 RPM drive in it instead of 5400? It seems from my research that the extra heat from the faster drive isn't really a problem, but what about battery life? 3. Has anyone replaced their drive with a 7200 RPM or other? What are your experiences? P.S. I don't have the MacBook yet, but I plan on getting it in a few weeks, just planning ahead. Thanks!