Lite-On SLW-831SX External Slim-Slot Half Height 8x DVD Burner Compact DVD-RW drive is ideal for notebook users Portable design uses High Speed USB 2.0 connection to ensure the best performance SMART-BURN technology avoids Buffer Under-Run error, automatically adjusting writing strategy to provide the best burning quality SMART-X function adjusts CD-DA/VCD/DVD data extraction to the fastest possible speed Supports Fixed Packet, Variable Packet, TAO, SAO, DAO, Raw Mode Burning and Over-Burn