Freecom Blu-ray Rewriter Pro. BD-R write speed: 8 x, DVD+R write speed: 16 x, DVD-R write speed: 16 x. DVD+R read speed: 16 x, DVD-R read speed: 16 x, DVD-R Dual Layer read speed: 8 x. Interface: USB 2.0 , Optical disk diameter: 80 mm. BD-ROM transfer rate (sustained mode): 480 MB/s. Weight: 1.2 kg