Oh, I always forget about that silly drive definitions screen. I think it made sense in the days before drives could accurately report their own geometry and before bootable hard drives were the norm - you'd enter your drive parameters, save them to a file, and could then pull them from the file if you needed to reinstall the drive (or prep an identical one). Nowadays, it's pointless, and I think the version of HDToolbox in OS3.5 and 3.9 eliminates it entirely. You can essentially skip it by just selecting "Define new..."
