Lite-On DH-4O1S Blu-ray. CD read speed: 32 x, DVD+R read speed: 12 x, DVD+R Double Layer read speed: 8 x. Interface: Serial ATA. 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 41.4 x 180 mm, Weight: 1200 g, Height: 41.4 mm. Minimum RAM: 512 MB, Minimum processor: Pentium4, 2.0GHz, Compatible operating systems: Microsoft Windows Vista / Windows XP SP2 / Windows SP4