Are they SATA or IDE?
You simply need to connect a power cable from the PSU to the drive, and connect the SATA/IDE data cable from the drive to the motherboard. If it's an IDE drive, make sure the jumper is in the correct position.
Reading your response again, are you saying there are SATA DVD drives out there. If so, do I need one to make it compatible with the SATA HD.
I thought SATA only refered to HD's.