Nas drive capacity 500 gb form factor 35 inch rpms 7 200 rpm buffer 64 mb bus sata ii sata 300 series western digital raid edition re suitable for 24 hour continuous operation nas systems video surveillance systems mtbf 1 200 000 hours noise level operating 29 db noise level idle 28 db power consumption operating 79 watt power consumption idle 59 watt height 254 mm