well, its probably very much the same to what i had to do to get my scanner working with fc5t3. i had to change the permissions, chmod, the device to 766. it would work if i ran xsane as root but would give me a device busy/not found if run as user.
i dont know what the device is in your system.. probably something like /dev/hda or /dev/hdb, etc. you would type, as root, chmod 766 /dev/hd? (?=whatever letter your cdwriter is).
I am root. If you see me laughing you better have a backup.