Sony Optiarc BWU-500S. DVD-R write speed: 16 x, DVD+R write speed: 16 x, DVD-RW write speed: 6 x. DVD+R read speed: 16 x, DVD-R read speed: 16 x, CD-R read speed: 48 x. DVD drive average random access time: 150 ms, CD-ROM drive average random access time: 150 ms, BD-ROM average random access time: 250 ms. BD-ROM transfer rate (sustained mode): 192 MB/s. Interface: SATA