I see no point of burning two dvd or cd at the same time. Unless your pirating softwares, songs, games and movies. Just joking.
Well to start with the hardware are not fast to be able to do the task if it is possible in the first place. Besides burning a dvd or cd put a lot of stress on the hardwares especially the cpu. Even if you can able to do so, it will slow down the system drastically making it a lot slower. So your best with that hardware is to burn one dvd or cd at a time, in that way the pc is only doing one task enabling it to perform its fastest.
Okay, let's say that burning one dvd would take 20 minutes. Now burning two 2 dvds at the same time will not take 20 minutes but maybe more because it is multitasking. To my knowledge, first I have never seen or heard or known someone having their pc burning to dvds at the same time.
That kind would only apply to people or company that are producing softwares and not to mention the criminals who burn or copy softwares illegaly. The pirates or scurvy dogs.
Is it possible to burn to dvds at the same time, absolutely. And in doing so would only severly lower the systems performance.
Maybe there's people that have it, I have only one burner and one rom drive.
But if the computer has higher performance then I believe it can multitask and burn two dvds at the same time.