First get the device name
dmesg | egrep -i --color 'cdrom|dvd|cd/rw|writer'
Create mountpoint if not exsists
mkdir /media/cdrom
mkdir /media/disk
Syntax to mount DVD / CDROM in Linux
mount -t iso9660 -o ro /dev/deviceName /path/to/mount/point
For Example
mount -t iso9660 -o ro /dev/sr0 /cdrom
Syntax to mount disk in Linux
mount /dev/deviceName /path/to/mount/point