Sony Optiarc BDX-S500U. 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: 6 x. DVD drive average random access time: 180 ms, CD-ROM drive average random access time: 190 ms, BD-ROM average random access time: 230 ms. Interface: USB 2.0. Compatible operating systems: Windows XP Windows Vista Windows 7