Sony Optiarc DRX-S70U-W. CD write speed: 24 x, CD rewrite speed: 24 x, DVD+R write speed: 8 x. CD read speed: 24 x. DVD drive average random access time: 180 ms, CD-ROM drive average random access time: 150 ms. Disc loading type: Tray, Drive device, buffer size: 2 MB, Interface: USB. Burst transfer rate: 480 MB/s