Using up to 16x disks

This units DVD drive is only able to spin at a max of 8x on DVD-Rs and max of 2x on DVD-RWs. Also, this unit is a - only recorder. This means if it is a +, it's not going to work.
Since the unit is a DVD-R 4x max recorder, the unit will need to have it's firmware upgraded. This will only help to record to a DVD-R 8x. You can purchase this upgrade with the manufacture of the unit. Call the 1-800 number listed in your manual and press 3. They will walk you thru the steps to find out which upgrade is needed.