I've installed Red Hat 9 via the installation CD, and created a boot diskette.
When I need to get into rescue mode I see that I can get to the installation boot prompt in one of these ways:
By booting your system from an installation boot diskette made from the boot.img image. This method requires that the Red Hat Linux CD-ROM #1 be inserted as the rescue image or that the rescue image be on the hard drive as an ISO image. 
How to I put the "rescue image on the hard drive as an ISO image"?
I'd like to have this in case I don't have access to the installation CD, but do have the boot diskette.