USB port uses type A socket and USB device uses type B socket unless it doesnt have a socket in that case its terminated with a type A plug fly lead. If that make any sense to you.
If you buy a standard USB cable and you find that one end have type A plug and the other is type B. You will also find that this DVD drive comes with the type A-B USB lead anyway.
By the way type A is the flat rectangular shape port and type B is square.