Hi, I have a Seagate 300GB External currently hooked up to my PC. The problem is, I want to back some things up from my iBook onto the external. When I plug the external into my iBook via firewire cable, I go to Get Info on the external, and the permissions say read only, thus I can't copy anything from my iBook to it. Copying from my PC to the external, however works. How do I change the permissions to accomplish my goal?