If you are using the CDROM during the post installation process, The cdrom is unmounted. This is a good thing, but there are times access is still required. To mount the CD add the following line after the %post statement %post --nochroot mkdir -p /mnt/source mount /tmp/cdrom /mnt/source /\ <lots of commands> \/ umount /mnt/source and make sure the .discinfo is in the root directory of the CDROM or Red Hat 9.0 will not be able to find the CDROM. After the %post statement -- damien clarke <damien.clarke@xxxxxxxxxxxxxx>