Lenovo ThinkPad Ultrabay Enhanced Blu-ray Burner. CD write speed: 8 x, CD rewrite speed: 4 x, BD-R write speed: 2 x. CD read speed: 24 x, DVD-ROM read speed: 8 x, CD-ROM read speed: 24 x. DVD drive average random access time: 180 ms, CD-ROM drive average random access time: 150 ms, BD-ROM average random access time: 300 ms. Drive device, buffer size: 8 MB, Interface: IDE/ATA. Dimensions (WxDxH): 128 x 129 x 12.7 mm, Weight: 150 g, Height: 12.7 mm