@Phenom, I think you must try burning the CD in Ubuntu Linux. In Windows it won't work.
Anyway, you want to take a backup of a very valuable CD. There's nothing wrong in
giving it a try in Ubuntu Linux. 40X is the speed at which you burn the CD. You can
also try burning the CD at a lower speed. The cost of a CD is just less than 10 /- Rs.
And you definitely want to take a backup of the CD right? Then go ahead.