So i have never used this. The empty slot at the bottom was like that when i bought it. I have always kept it covered so no dust would get in there.
I'm guessing you can turn it into a 5th burner. It has 4 on here already. The item "Copystars CD DVD Duplicator 4 (or 5) burner DVDRW Copier Duplicator" is in sale since Thursday, July 23, 2020.This item is in the category "Computers/Tablets & Networking\Drives, Storage & Blank Media\CD, DVD & Blu-ray Duplicators". The seller is "womaninthewall" and is located in Salt Lake City, Utah.
This item can be shipped to United States.