Sony BC5600S-01. CD write speed: 16 x, CD rewrite speed: 10 x, DVD-R9 write speed: 4 x. CD read speed: 24 x, DVD-ROM read speed: 8 x, BD-ROM read speed: 2 x. DVD drive average random access time: 200 ms, CD-ROM drive average random access time: 190 ms, BD-ROM average random access time: 320 ms. Interface: Serial ATA. Optical disk diameter: 120 mm