The Addonics Optical Tower is one of the most versatile optical storage solutions that you will find on the market. The Optical Tower will enable you to attach multiple DVD burners to a Port Multiplier (PM) compatible eSATA port or USB port on any computer with just one or two cables depending on the model. Once attached, multiple optical drive letters appear on your system. You can then use these optical drives for simultaneous DVD burning, or to run different burning job on different drives without any waiting around. You can also share these drives over the network for access by other computers to share the DVD or CD titles.