I am adding a new EIDE hard disk into the primary IDE controller and my machine information is:
1) BIOS A06
2) No SCSI drive at all
3) system setup said "Primary Drive 0 .... OFF" -- cannot change it
4) Secondary IDE controller has one DVD drive and one CD drive
If I unplug the CD drive and replace it with the the EIDE hard disk then I can see the disk on the "Secondary Drive"