Samsung SE-506AB. 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, DVD-RW read speed: 8 x. DVD drive average random access time: 180 ms, CD-ROM drive average random access time: 170 ms, BD-ROM average random access time: 300 ms. DVD-ROM transfer rate (sustained mode): 10.8 MB/s, BD-ROM transfer rate (sustained mode): 27 MB/s, CD transfer rate (sustained mode): 3.6 KB/s. Interface: USB 2.0