Lite-On SHW-1635SX External 16x DVD-RW Dual Drive Supports DVD+R / DVD+RW / DVD-R / DVD-RW / DVD-ROM / CD-R / CD-RW / CD-ROM formats Double layer DVD+R DL and dual layer DVD-R recording function Write speeds to 48X USB 2.0 connection, portable design, plug and play, emergency manual eject function The 2MB buffer and Smart-Burn technology minimize recording errors.