Nas drive memory capacity 4 tb form factor 35 inch rpms 7 200 rpm buffer 128 mb bus sata iii sata 600 series western digital red suitable for nas systems 24 hour continuous operation charge and discharge cycles 600 000 data transfer rate 201 mbs mtbf 1 000 000 hours manufacturers guarantee 60 months noise level operating 36 db noise level idle 29 db power consumption operating 91 watt power consumption idle 58 watt power consumption