Sony Optiarc BC-5640H. DVD-R write speed: 8 x, DVD+R write speed: 8 x, DVD-RW write speed: 6 x. DVD+R read speed: 8 x, DVD-R read speed: 8 x, CD-R read speed: 24 x. DVD drive average random access time: 180 ms, CD-ROM drive average random access time: 190 ms, BD-ROM average random access time: 320 ms. BD-ROM transfer rate (sustained mode): 150 MB/s. Interface: SATA