Barry_Green
Moderator
If you want to be safe, you'd turn the computer off. The computer is the device that's supplying power. No 4-pin port carries a power signal, so whether the camera is on or off, it's not putting power on the bus. But the computer is.
So for 100% reliable safety, if using a 6-pin firewire port on your computer, you should turn the computer off before plugging in a camcorder.
For 4-pin computers (like PC laptops) it's not an issue; you can safely hot-plug all day long regardless of whether the power's on to the computer or the camera or both. But for a 6-to-4 connection (such as with PC desktops and all Macs) there is a risk, as we've seen dozens of reports of people with various types of camcorders reporting burnt-out firewire ports.
So for 100% reliable safety, if using a 6-pin firewire port on your computer, you should turn the computer off before plugging in a camcorder.
For 4-pin computers (like PC laptops) it's not an issue; you can safely hot-plug all day long regardless of whether the power's on to the computer or the camera or both. But for a 6-to-4 connection (such as with PC desktops and all Macs) there is a risk, as we've seen dozens of reports of people with various types of camcorders reporting burnt-out firewire ports.