I just got a new external USB hard drive (Western Digital, 160 GB) and would like to clone the drive I am using now over to my new external. I literally only have about 4 gigs of free space right now, so this drive will come in very handy. If I do clone it, is it possibe to boot from it rather than the drive in my PowerBook? I read it's possible on FireWire, but what about USB? If I can't boot from it, that's okay. As long as I can back-up my files and free up some space, that's really all I need. But if I can clone my drive and boot from it, then how would I go about doing this? I already installed SuperDuper! and see the option to copy all my files, but the external drive has to be formatted for the Mac. I am in the process of doing that now. I am writing over all zeros with Disk Utility in the Mac Extended format. Is this okay? Please get back to me. Thanks and happy holidays!