ASUS DRW-24B3ST. CD write speed: 48 x, CD rewrite speed: 24 x, DVD+R write speed: 24 x. CD read speed: 48 x, DVD+R read speed: 16 x, DVD-R read speed: 16 x. DVD drive average random access time: 150 ms, CD-ROM drive average random access time: 150 ms. Drive device, buffer size: 1.5 MB, Interface: Serial ATA, Mounting: Vertical/Horizontal. Optical disk diameter: 120 mm