Mod Firewire port into my USB External HD Case?
Answer:
I'm not really all that sure, but I don't have a sneaking suspicion that it's possible. Firewire and USB are setup two completely different ways and even use a slightly different amount of power in their feed. There area few more cable that serve different purposes in Firewire when compared to USB. I know that when installing any of these ports to your motherboard, you've gotta be cautious not to confuse the 2 because it could wounded your board and the devices being plugged contained by.
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