It will create by default an additional 8MB partition space for storing mbr and other drive info but not 8GB. Is this a Hybrid Drive ? ATAPI suggests an IDE drive unless it missreads your DVD as HDD and DVD is IDE connected, which would mean you have a blank DVD in the drive. As far as your 500 gigabit drive, 476.9 gigabytes is about the right size for it, you're not missing anything, partition and format that. No Problem.