This product is either discontinued or we cannot get that from suppliers.
Lenovo 4XA0E97775 Thinkserver Ultraslim Usb, DVD-Writer, Optical Media DVD-RAM/±R/ ±RW, Media Layer Double-layer, External Drive, Host Interface USB 3.0, Buffer 768 KB, O/S Operating System(s): Windows 7, Windows 8.
ThinkPad UltraSlim USB DVD Burner a small form factor external portable DVD and CD recordable drive that can be attached to Notebooks with USB2.0 port or USB3.0 port.