Some (all?) DV camcorders transfer the raw DV data over Firewire but recompress the video when tranferring over USB. DV camcorders are really meant to be used with Firewire.

For a moment in the late 1990s and early 2000s, the future looked uncertain for the Universal Serial Bus (USB). At the time, it was IEEE 1394 (better known by the Apple trademark FireWire) that ...

FWIW, I like IEEE 1394a because it seems to have a better sustained transfer rate over USB 2.0, and I've had some bad experiences with USB 2.0 enclosures that I've never had with any of my 1394a ...

The D-Link High Speed USB 2.0 and FireWire Combo PCI Adapter accomplishes several things at once. First, it adds both USB 2.0 and FireWire ports to the motherboard. Second, because it's a combo card, ...