I'm trying to upgrade a rh 9 system to centos 4.1.

I burned the part 1 iso image onto a cd using cdrecord.

Given my experience upgrading rh installations, I next tried booting
from the cd. It fails with the message(s):

ISOLINUX 2.11 2004-08-16 Copyright(C) 1994-2004 H. Peter Anvin
isolinux: Disk error 80, AX=42CC, drive 9F

Boot failed: press any key to retry.

I have tried booting the cd on a couple of systems and it does the
same. Moreover, I know that bootable cd's work on the system (laptop)
in question, as that's how I put rh 9 on the system in the first
place.

However, I've looked at the cd (under windows) and there are
directories on the cd, not just an iso file. So, I don't think I
wrote the cd wrong.

Am I correct in assuming that perhaps there was a write error on the
cd and the boot image was corrupted?

Is it likely that the cd contains a useful copy of the installation if
I can just get it booted? (Or is the cd just a coaster and should I
write another one?)

Is it possible to boot the cd from the linux boot I already have
installed? The target system is a laptop and I have a choice of a
floppy or a cd, but not both at the same time.

Thanks in advance,
-Chris