proneer dvd光驱无法mount

fannao

redhat9.0系统，proneer dvd光驱无法mount,从硬件浏览器中可以看到此设备，表示系统已认出此硬件设备，但无法mount文件系统。如下：
[root@linux /]# mount -t iso9660 /dev/scd0 /mnt/dvd
mount: block device /dev/scd0 is write-protected, mounting read-only
mount: wrong fs type, bad option, bad superblock on /dev/scd0,
       or too many mounted file systems
请问是何缘故，谢谢先。