Help please. I just bought the pioneer avic n1 radio and it has a navigation cd that it uses, I want to copy this dvd before i ruin mine. The dvd has 6.81 gig of information on it and i can only find 4.7 gig dvds. I called a few places and nobody carries anything more than the 4.7

The dvd dont look like it is double sided (there is color and writing on one side so i guess that means its only one sided), How can I copy this DVD?

thanks

adam