LaCie d2 Blu-ray 12x. DVD-R write speed: 16 x, DVD+R write speed: 16 x, DVD-RW write speed: 8 x. DVD-R Dual Layer read speed: 8 x, DVD+R Double Layer read speed: 8 x, BD-ROM read speed: 8 x. DVD-ROM transfer rate (sustained mode): 1.38 MB/s, BD-ROM transfer rate (sustained mode): 4.5 MB/s. Interface: USB 2.0. Compatible operating systems: Windows Mac OS