I don't think there is an option for "on". That would have been awesome. I was looking for that! The system indicated that the cable is 80 wire, and the hard drive is connected to the end of the primary ide ribbon cable with jumper set for cable select. System identified it as disk 1.
I'm guessing that I have to reformat hard drive so there is no data on it for the system to enable the disk.
Thanks for your help.