Think of it a bit like a memory stick plugged into a USB socket. In principle, with a stick, you can put the files anywhere you like. Fire wire is like that but you use your movie programme to store the information - in your case Sony Vegas. Sony Vegas has a video capture/import function and pretty much expects to use firewire. You will find the manual quite helpful (on the programme CD). You can put the files where you want, but it will default to a folder on your C drive. The only real difference between the sticks and video is that video is not drag and drop until it's on the computer.