USB 1.1 moved data at 12 Mb/s and carried insufficient power to charge an iPod. Whereas FireWire shifted data at 400 Mb/s. That difference was huge. Apple didn

USB 1.1 moved data at 12 Mb/s and carried insufficient power to charge an iPod. Whereas FireWire shifted data at 400 Mb/s. That difference was huge. Apple didn’t come out with USB support for the iPod until USB 2.0 became a common feature on PCs, with it’s theoretical speed of 480 Mb/s (in my experience of real-world use it was actually still slower than FireWire 400) and sufficient power.