Yeah but Macs were pretty close to the bottom of their popularity in 2001 and Firewire was near non-existant on PC. It was really only a high-end PC thing or maybe an add-on for those FW capable camcorders. When the iPod launched USB 2.0 was already out, available on okayish PCs (not Macs yet though) and was pretty much fast enough as was seen with later USB 2.0 capable iPods.