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to /etc/fstab or use the full mount command. Ensure that /mnt/cdrom exists too.
The options users,noauto,ro allow any user to mount and unmount cdroms, it not automouted at boot and cdroms are mounted read only.
If you don't trust your users, you can add other options, like noexec, to prevent programs on optical media from being run.
Distribution: Ubuntu, RedHat, VMWare, CentOS, Windows, Android, Mac
This command is not the complete command to mount a filesystem. Issuing this command will search for an entry for /dev/cdrom in the fstab, and in your case since this is missing, it will kick you out with this error.
Complete mount command is:
mount /dev/cdrom /mnt/cdrom
And if you want this to be mounted on system reboot too, as in the entry in the fstab and do "mount -a". This mount -a will re-read the fstab and remount what ever file system is not mounted.
So once you do mount -a and then a df -h, you must see your cdrom mounted on /mnt/cdrom .