You can have as many optical drives as you have bays in your case and ports on your motherboard. I usually have 2 in my computer with one being a ROM drive and the other being a burner. That makes disk to disk burning easier than having one drive. For some reason I only have 1 optical drive right now. I have been meaning to get a BluRay burner since prices have come down so much but I just have not got around to it.