New hdd, moved RedHat partition, floppy boot won't.

Well, subject line says it all.

I've been booting RH with my floppy until I got a handle on Partition Magic
5's boot program.
I bought a 20GB hdd to replace those 3 little drives I'd been using.
Red Hat 6.2 was on hdb1 and is now hda2.
Now the obvious question is:
How do I direct my boot floppy to find the root partition at /dev/hda2 ??

Thanks