I think a key word from the tutorial listed above is adding an additional drive to AN EXISTING server.
Booting up a PC with 4 drives to install SME will not get the desired results. Install with one drive then add additional as per the tutorial.
I currently have 4 drives ranging from 40gig to 190gig on my SME box. (Have an IDE PCI controller ATA133 that came with the largest drive so I theoretically could fit three more before having to drop out the cdrom)