Thanks for your help. I've had a confusing success.
In the target configuration, my linux hd that was hda becomes (surprisingly) hdc, not hdb. I see no hdb in the RH9 hardware browser. There were some scary non-booting moments when I made changes assuming the second drive was hdb, but I was saved by a fresh boot-disk.
I now have the following working setup:
change "hda" to "hdc" in fstab, and leave "hd0" as "hd0" in grub.conf.
Grub seems to work fine. But I would have thought grub required a change from "hd0" to "hd2", which I have not tried yet due to the gut-wrenching hdb experience
. Any thoughts? Is it dangerous to leave it as is?
BTW a Gateway Solo with two hard disks sounds like a jet ready for takeoff! ha ha