ASUS DRW-24B5ST. 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: 160 ms, CD-ROM drive average random access time: 140 ms. Drive device, buffer size: 1.5 MB, Optical drive type: DVD±RW, Interface: Serial ATA. Optical disk diameter: 80, 120 mm