Can I download HD video using Firewire but have the destination be a external hard drive via 2.0 USB? Can I put iMovie on the external and use that to edit the video? I don't have enough hard drive space on my internal or should I install the OS on the external and use that? Really would like some help on this. I have the iBook G4 last model made. I was looking at the Seagate Barracuda 7200.10 500 or 320 GB Ultra ATA100. I heard that SATA is not compatible with the iBook. Thanks.