DVD-RAM Support

I have a DVD -R/+R/-RW/+RW/RAM device (LG GMA 4040B): with Linux I am be able to burn DVD-R/+R disc. Now I would like to use also with DVD-RAM disc: I inserted in my kernel (2.4.22) udf filesystem (with write support): I inserted in /etc/fstab the following line (LG device is /dev/hda, my hard disk is /dev/sda) /dev/hda /dvdram udf noauto,sync, user 0 0 but when I run mount /dvdram I obtain: mount: block device /dev/hda is write-protected, mounting read-only mount: No medium found Can you help me? Thanks in advance