user123-HP-ProBook-4445s user123 # mount -t iso9660 /dev/sr0 /media/cdrom
mount: block device /dev/sr0 is write-protected, mounting read-only
mount: wrong fs type, bad option, bad superblock on /dev/sr0,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

I would expect mint to automatically mount the DVD when it is inserted. What type of DVD are you trying to mount i.e. data, movie etc.

It is an OS installation disk for Windows.

I checked it in another laptop with Windows, it works fine there.

Here are screens of the disks utility and the fstab that I modified after doing an online search for the solution:

Attached Thumbnails

   

What exactly are your intentions? What are wanting to accomplish by mounting the disk in Mint? If you want to install windows, why not just boot from the DVD? If you are trying to do something else, please explain exactly what.

I am trying to dual boot with Windows 7 as secondary OS and Mint as primary. However, I have done boot from DVD before but this CD is not running at Boot-Time. It is a custom-made CD, so I thought I would access it in a desktop session and check the files myself.

This is why I'm trying to mount instead of booting from DVD.

Have you tried using udf instead of iso9660?

If you just want to view the folders/files try something like this which worked with windows tech preview iso. First created the mount point directory win-usb then ran the command below from the directory in which I had win-usb:

Running ls win-usb/ shows the folders and files in the root of the filesystem:

Obviously need to change the mount point name to whatever you use and have the exact name of the iso file. You need to preface the command with sudo if you are using Mint. This will mount it as read-only so you can't make any changes. You would have to copy it to a partition, probably formatted ntfs to make changes as. Still I am not sure what your purpose is. Are you expecting to have to modify some file to boot because you are now unable to boot your 'custom' CD? I don't really use windows so don't know how you would go about that. You can boot a standard windows iso, if extracted from Grub2 which I did with the Tech Preview but if there is something wrong with the boot files on windows, that's another problem.