Sony Optiarc BC-5500S-01. DVD-R write speed: 8 x, DVD+R write speed: 8 x, DVD-RW write speed: 4 x. BD-R read speed: 2 x, DVD-ROM read speed: 8 x, CD-ROM read speed: 24 x. DVD drive average random access time: 200 ms, CD-ROM drive average random access time: 190 ms, BD-ROM average random access time: 320 ms. Interface: SATA. Dimensions (WxDxH): 128 x 129 x 12.7 mm, Weight: 0.2 kg