Hello, just bought a 1TB LaCie Hard Disk Quadro, which has a FireWire-800 interface, this was the reason for buying this one. I use it to put my videos on it and edit them with iMovie, for that USB 2.0 is not fast enough. When I connect the Hard Disk to my computer with the FW800 to FW800 cable, my iMac doesn't show that it is connected. If I use USB to connect it, it does show that. Is there anyone who knows why it doesn't work? Thanks.