According to this post DV Duscussion "Rod Rod" claims it is bad to capture and edit movies on your primary internal system drive as it will cause problems. I have a powerbook which I capture all my DV onto the primary internal drive and edit it when I get a chance. When I am done with the project I remove all unused clips and then copy it over to my external drive to keep. What kind of damage am I doing? I have not had anything bad happen as of yet. It would be ashame if I had to be always connected to my external drive while editing movies. This is the main reason I got a laptop as I can copy all source material to my drive and edit whereever and whenever I please.