Sony Optiarc BC-5640H. DVD+R write speed: 8 x, DVD-R write speed: 8 x, DVD-R Double Layer write speed: 6 x. DVD-ROM read speed: 8 x, CD-ROM read speed: 24 x, BD-ROM read speed: 6 x. DVD drive average random access time: 180 ms, CD-ROM drive average random access time: 190 ms, BD-ROM average random access time: 230 ms. Drive device, buffer size: 4.5 MB, Optical drive type: Blu-Ray, Interface: Serial ATA. Dimensions (WxDxH): 128 x 126.1 x 12.7 mm, Weight: 160 g