Sony AD-5590A-01. CD write speed: 24 x, CD rewrite speed: 24 x, DVD-R9 write speed: 6 x. CD read speed: 24 x, DVD-ROM read speed: 8 x. DVD drive average random access time: 180 ms, CD-ROM drive average random access time: 150 ms. Interface: EIDE/ATA. Optical disk diameter: 120 mm