Hello, I am getting a new 15gb iPod. I saw that it came with a firewire cable and an AC Adapter. I thought it was interesting that you charge it by pluging in the firewire cable to the ac adaper or your pc. I wanted to know if I got the USB 2.0 and firewire cable if I could hook the usb into my computer and the firewire into the ac adapter? So I could charge while syncing?