I'm expecting a LaCie D2 160GB external drive to show up next week, and I was wondering if it's a good idea to make it my main drive. First of all, do you think it's even a good idea? Will it make my computer faster, since it's a faster RPM than the one in my eMac? Do I need to put OS X on the external drive before I boot to it? Do I need to do anything else before I boot to it? Hopefully someone can answer my questions. Thanks in advance!