No disc in the drive?

I just installed Nero and it says there is no disc in the drive when I put in an original DVD movie(Top Gun). What do I need to do, and how do I access the command line? First time using Linux. I just installed it. :o

It would be nice if you knew that I am using Red Hat 9.1.

Wow… The version is rather really really (and even more) old. You should first update to the lastest one, the version.

O.K. I just went and got I will try it tonight.