Sony Optiarc AD-7173S. CD write speed: 48 x, CD rewrite speed: 32 x, DVD+R write speed: 18 x. CD read speed: 48 x, DVD-ROM read speed: 16 x. DVD drive average random access time: 160 ms, CD-ROM drive average random access time: 140 ms. Disc loading type: Tray, Optical drive type: DVD-RW, Interface: Serial ATA. Burst transfer rate: 150 MB/s