Hi Greg,
First off, let me point out that I’m a Mac user and not a Windows person, so I can’t give advice from a PC perspective. What I do know is that it’s generally accepted that your camera should be on a separate firewire BUS from the hard drive your capturing to. For myself, my computer comes with FW400 and 800 but they both share the same BUS. That’s where I plug my camera/deck into. I also have a FW PCI card that all my FW hard drives are plugged into. That’s a separate FW BUS. Works like a charm. In a pinch I have connected my deck into the back of one if my FW drives for capturing purposes and it has worked, but it’s not recommended to do that on a regular basis.
I’ve also heard about the odd problem in the past using Canon cameras as a deck connected to computers and have never heard whether or not the problems were resolved. Might I also recommend that you purchace an inexpensive one chip camcorder for use as a deck instead of wearing out the tape transport of your expensive XL2 by using it for capture purposes. Virtually any mini-dv camcorder with a firewire port will do. People use this method all the time and there will be no loss in video quality during the capture process.
– Don