CentOS 6.4: Unable to mount disc, doesn't like UDF

I'm trying to use a CD on CentOS 6.4, but I keep getting this error:

Unable to mount Disc Error mounting: mount: unknown filesystem type 'udf'

I've installed udftools I've tried changing the permissions around on /dev/sr0 to no avail. I've tried various ways of mounting the disc such as: - mount /dev/sr0 /mnt (unknown filesystem type 'udf') - mount -t auto /dev/sr0 /mnt (unknown filesystem type 'udf') - mount -r -t iso9660 /dev/sr0 /mnt (wrong fs type...) - mount -t udf /dev/sr0 /mnt (unknown filesystem type 'udf', despite being in the man page for mount) - dd if=/dev/sr0 of=disc.iso -> mount -o loop disc.iso /mnt -t iso9660 I can see and read from the disc just fine in a VM on that host and on other physical machines. It also seems to happen with just about every disc that I've tried. Any thoughts?