HP940E - 18X DVDRW (LightScribe + Super AllWrite),External H/H.Black,Retail,Burst transfer rate:33 MB/s max,Access time:DVD 160 ms; CD 160 ms(typical) Box contents - External dvd940e drive with DVD+-R/+-RW and DVD-RAM read/write, +-R double-layer capability, and LightScribe direct disc labeling, Software CD including electronic user's guide, Quick-Start placemat, Getting Help guide, USB 2.0 cable, Power supply Get the latest optical storage features in the HP dvd940e Record to single- or double-layer DVDs, and now to DVD-RAM Burn labels directly to disc with the latest LightScribe technology Write speed - DVD+R up to 18x (CAV), DVD+RW up to 8x (ZCLV), DVD-R up to 18x (CAV), DVD-RW up to 6x (ZCLV), DVD+R Double Layer up to 8x (ZCLV), DVD-R Dual Layer up to 8x (CLV), DVD-RAM up to 12X (PCAV), CD-R up to 48x (CAV), CD-RW up to 32x (ZCAV)