Hello, I need a external hard drive that I can hook up to my PC to take off about 400 gigs of music and transfer it to my MAC PRO! So I basically need to know if I can do that without reformatting the ext. H.D.? Ebay has a LaCie 500 Gig for $130. USB 2.0 is the only way for me to go because my PC is old. Any suggestions? Sites?