Chroot script: mounting dvdrom

Hi I have to copy some files from installation media (dvd-rom in my case) after installation process, in chroot script. In SuSE Linux Prof. 9.3 there is no problem cause in that script I'm albe to find mounted iso9660 device and copy necessary files from there. But in SLES9 SP3 this method doesn't work - mount command in chroot script returns that there is no mounted iso9660 devices. Of course I can try to mount /dev/cdrom by default but it is not enough in case when there are 2 and more dvd drives - I don't know in which the installation media is. How to find out from which device the installation has been done ? Or maybe there is another way to solve that in SLES9 ? Regards, Radek