Hi, I just got my new Seagate 640gb external hard drive and am in the process of formatting it on my MBP. However, I am not sure which format to do? My main use for the hard drive is for transferring media files back and forth between my MBP and PC using just one partition on the drive. I already know I'm not supposed to pick 'Mac OS Extended (Journaled)' because I believe that is to use it as a boot drive. So should I pick 'Mac OS Extended' or maybe 'Free Space'? Thanks.