Lite-On SHM-165P6SX 16X External DVD&plusmn;R/&plusmn;RW Dual Layer Burner External DVD-Dual drive, supports DVD+R/+RW, DVD-R/-RW, DVD+R DL/-R DL, DVD-ROM, CD-R/-RW, CD-ROM formats Supports Double Layer DVD+R DL & Dual Layer DVD-R recording functions Portable design, using USB 2.0 connection to ensure the best performance Plug & Play, and emergency manual eject function is embedded SMART-BURN avoids Buffer UnderRun Error by adjusting writing strategy and running OPC for the best burning quality