I have recently purchased a 27" imac and had an abysmal experience trying to use Time Machine to transfer all my data from my old 21.5" imac - permission issues all over the place. Soooo, I am getting ready to wipe the new hard drive and begin anew. I used a FireWire several years ago to transfer all my data from an old emac to a newer G5 and it worked beautifully so I'm inclined to use this method again. My question is this, is an adapter for the 800 to 400 going to do the trick or should I purchase an 800 to 400 FireWire cable? And if cable is the answer, can anyone suggest a brand? Thanks so much for any guidance. I'm a work-from-home designer and this is NOT my forte!