Lenovo 42T2599. CD write speed: 24 x, CD rewrite speed: 16 x, DVD-R Double Layer write speed: 4 x. CD read speed: 24 x, DVD-ROM read speed: 8 x. DVD drive average random access time: 180 ms, CD-ROM drive average random access time: 150 ms. Optical drive type: DVD±R/RW, Interface: Serial ATA. Dimensions (WxDxH): 129 x 131 x 9.5 mm, Weight: 0.14 kg, Height: 9.5 mm