ASUS BW-12D1S-U. BD-RE write speed: 2 x, BD-R write speed: 12 x, DVD+R write speed: 16 x. DVD+R read speed: 16 x, DVD-R read speed: 16 x, DVD-R Dual Layer read speed: 12 x. DVD drive average random access time: 170 ms, CD-ROM drive average random access time: 150 ms, BD-ROM average random access time: 250 ms. Drive device, buffer size: 4 MB, Interface: USB 3.0, Optical disk diameter: 120 mm. Dimensions (WxDxH): 243 x 165 x 63 mm, Weight: 1.29 kg