[hijacker]

I first asked this question 3 days ago but had no answer, so i'll try again.
I have copied a 4cd game (legend of dragoon) and halfway through cd4 the game askes me to put in cd3 to continue with a quest.
How do I get cd3 to load at the needed place?
surely I need to re-boot which only takes me to the beginning or a save and not where I need to be in the game.
any help appreciated.