This is a vintage Apple Duo Disk A9M0108 floppy drive, made in Japan. It is compatible with Apple brand products and is a unit type floppy drive. The unit quantity is one and it is a vintage item. The drive is untested and is perfect for collectors or those who enjoy vintage computing we do not have the equipment nor the knowledge or time to test this kind of equipment...The item category is Computers/Tablets & Networking and Vintage Computing, with a focus on Vintage Parts & Accessories we are selling this for parts or repair but to be honest we don't even know if it is working that is most likely no refunds no returns on this one...