Can't mount cdrom

When I try to mount a CDROM which is definitely in the drive, I am informed that it does not find the disc

= sudo  mount  /dev/sr0  /mnt/cdrom
mount: /mnt/cdrom: no medium found on /dev/sr0.

This may be related to the fact that when I specify the filesystem type as iso9660 or udf, it claims these are unknown filesystem types.

Thunar also does not mount the disc, though I do have volume management enabled and configured to automatically mount removable media.

lsblk does show sr0 as a rom device, and even shows the expected size of the files on that disc.

= lsblk -P /dev/sr0
NAME="sr0" MAJ:MIN="11:0" RM="1" SIZE="23.5M" RO="0" TYPE="rom" MOUNTPOINTS=""

Do you have thunar-volman and the gvfs packages installed?

Yes. Actually I had thunar-volman-devel installed, and I replaced it with the standard thunar-volman. Still no joy.

Maybe module sg is not loaded?

Note: running with sudo does not work
su root
echo sg > /etc/modules-load.d/sg.conf

Or udf tools are not installed, this is needed for udf type cd or dvd

Thanks for the tip. Now it doesn’t complain about udf or iso9660. However, it still complains that no media is found.

Blockhead here finally realized that the disk is Blu-ray, and the drive is an old CD/DVD drive. So it’s no wonder the software couldn’t find the media.

Sorry about the stupid question.

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