Try setting the device control to FireWire Basic, and also be sure your scratch disk isn’t your startup disk.
Might post more about your setup… what is your scratch disk, OS, Version of QT, and FCP?
Sometimes FW drives will not work well with DV cameras if they are connected to the same bus on your computer. An inexpensive solution is to create a new bus with a pci card, or a express card…
Jerry
Apple Certified Trainer
Author: “Jerry Hofmann on Final Cut Pro 4” Click here
Dual 2 gig G5, AJA Kona SD, AJA Kona 2, Huge Systems Array UL3D