Wd my cloud dl2100 4tb 2 bay nas product specifications average latency na average read seek na battery na cachebuffer na data transfer rate na disk capacity 4 tb drive bays 2 interfaces usb 30 x 2 2 x gigabit ethernet 2 x power supply dc in memory 1 gb expandable to 5gb with 4 gb udimm processor intel atom c2350 17 ghz turbo mode up to 20 ghz rotational speed na tape drive na write speed na product dimensions and weight length 851 in 21610 mm