Simply typing mount with no arguments lists the currently mounted filesystems.
mount -t iso9660 CD-device /cdrom
For this command, you should substitute the name of your CD-ROM device for CD-device in the above command line. If you aren’t sure, /dev/cdrom is a good guess because the install process should have created this symbolic link on the system. If that fails, try the different IDE devices: /dev/hdc, etc. You should see a message like this: mount: block device /dev/hdc is write-protected, mounting read-only.
The -t option specifies the type of the filesystem, in this case iso9660. Most CDs are iso9660. The next argument is the name of the device to mount, and the final argument is the mount point. There are many other arguments for mount; see the manual page for details.
Once a CD is mounted, you may find that your drive tray will not open. You must unmount the CD before removing it.
ls /cdrom
Confirms that /cdrom now contains whatever is on the CD in your drive.
mount
Displays the list of filesystems again; notice that your CD drive is now mounted.
umount /cdrom