Lite-On External 4x Blu-ray BD ROM USB. CD read speed: 40 x, DVD+R read speed: 12 x, DVD+R Double Layer read speed: 8 x. DVD drive average random access time: 160 ms, CD-ROM drive average random access time: 160 ms, BD-ROM average random access time: 160 ms. Dimensions (WxDxH): 145.8 x 180 x 41.4 mm, Weight: 800 g. Minimum RAM: 512 MB, Minimum processor: Pentium 4 2.0GHz, Compatible operating systems: Microsoft Windows 2000 SP4 / XP SP2 / Vista. Operating temperature range (T-T): 5 - 50 °C, Operating relative humidity range: 8 - 80 %, Storage temperature range (T-T): -20 - 60 °C