I just bought a new mbp with a 320gb HD. The way I've set it up in the past was to have 2 partitions. 1 For my main Mac OS X drive and the other half for Storage. But some people said this is a waste of space. The reason I do this is because when a new version of OS X Comes out. I don't have to worry about losing files because I can just simply all the important files to my 2nd partition and then wipe out the 1st partition and install a fresh copy of the new OS X. But I'm afraid if I only have 1 partition it would make it a pain in the ass since I would have to reformat the drive and install the OS X. I prefer to install fresh and not update when a new OS X comes out. Can any of you guys recommend anything? I really would like to keep it as 1 partition. I guess if I use timemachine then I can just simply copy all my files over after I installed os x? I'm mostly worried about my itunes music, iphoto database, aperture database, ical, addressbook, mail, lightbox database, etc.