Hi, I have a 250gb external hard drive that I'd like to use to store our photos and music, etc. What is the best way to do that? Should I install an operating system on that hard drive first, or do I just format the drive and put the folders and files in? Also, on the dual g4 that I use, it has panther osx 10.3 on it right now, and on the macbook pro it is tiger osx 10.4. Will that matter? Should I upgrade the dual g4 (450mhz) to tiger? thanks!