Sony Optiarc AD-7220S. CD write speed: 48 x, CD rewrite speed: 32 x, DVD+R write speed: 22 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, Drive device, buffer size: 2 MB, Interface: Serial ATA. Optical disk diameter: 120 mm