In grub.conf I added hdc=ide-scsi and Red Hat automatically updated fstab during boot. cdrecord -scanbus showed a device at 0,0,0 I had prepared a file in /usr/LTSP using mkisofs -r -J -o /usr/LTSP/ltsp.iso /usr/LTSP ( got this from an English Linux magazine. I can never understand man documents ) So I tried to burn a CD using cdrecord -v dev=0,0,0 speed=4 /usr/LTSP/ltsp.iso and it looked good. I booted into ms windows and the CD is readable under DOS too. Thanks for all the advice. I would never have figured this out on my own. Strange that in 7.2, grub didn't need the statement hdc=ide-scsi, but I quess things change all the time. Thanks again!