Support double layer DVD+/- R9 recording function. Smart-burn avoiding buffer under run error, automatically adjusting writing strategy & walking OPC to provide the best burning quality. Smart-X function adjusts CD-DA / VCD / DVD data extraction to a fastest allowable speed according to both data request rate from host & disk quality. ABS system reduce vibration & noise during recording & reading Read Speeds DVD-ROM: 16x CD-ROM: 48x Write Speeds DVD-R: 22x DVD+R: 22x DVD-RW: 6x DVD+RW: 8x DVD-RAM: 12x DVD +R Dual Layer: 8x DVD -R Dual Layer: 8x CD-R: 48x CD-RW: 32x Access Time CD: 160ms DVD: 160ms BD: 160 ms