Wd my cloud ex2100 12tb 2 bay nas product specifications average latency na average read seek na battery yes cachebuffer na data transfer rate na disk capacity 12tb drive bays 2 interfaces usb 30 x 2 one in front one on the back gigabit ethernet memory 1 gb ddr3 processor marvell armada 385 dual core 13 ghz rotational speed na tape drive na write speed na product dimensions length 851 in 2161 mm width 428 in 1086 mm height 582