Postinstall directory copy

hello, I've been looking through the list for a few days now but couldn't a solution to my problem. I am trying to copy a directory from the self made autoinstall CD to the PC. I added this in my post script: cp -r /media/cdrecorder/somefolder /opt It worked because the drive is a cd rw! But this doesn't work with other drives. Cdrom for instance. Help needed ! Thank you ~