Hi does anyone know how much difference there would be in transferring files from the new ipod and a 5400RPM 160Gb 2.5" external drive? I have been thinking about purchasing an exteral drive for a while and with the increased IPOD size I may just upgrade my ipod instead. It says the current model has Hard Drive: 30/60 GB 4200 RPM (ATA-66) Would there be a noticable difference. I need to transfer files approx 500Mb at a time. Thanks!