I think Firewire was a smart choice when launching to Mac users first, since USB1 was so slow, USB2 was still very new, and all new Macs had Firewire ports. Tha

I think Firewire was a smart choice when launching to Mac users first, since USB1 was so slow, USB2 was still very new, and all new Macs had Firewire ports. That said, opening the door to Windows later on was absolutely the key to the popularity explosion, but by that time many more Windows machines also had USB2 ports for fast syncing.