I am looking at getting an external hard drive very quickly to back up mainly music, pictures and some personal files. I am looking at the WD passport Studio 320GB and it says that with Tiger you need backup software. Do i actually need this software or can i just plug in the drive and drag and drop it with no compression?? i know i wont use 320GB ever. second question is if this Hard drive is any good or does anyone have other suggestions on a better model that i can get in the next couple days.