Cant mount cdrom dvd

[mahesh]

Hi this is the first time i have used ubuntu and cant get my cd/dvd to work its showing up in the bios but wont auto mount when i insert disk.
I have searched but cant seem to find the answer.
I have tried sudo mount /media/cdrom0/ -o unhide.
i get cant find in /ect/fstab.

Any help appreciated.