Desktop hard drive memory capacity 4 tb form factor 35 inch rpms 7 200 rpm buffer 64 mb bus sata iii sata 600 series western digital purple suitable for 24 hour continuous operation video surveillance systems technology intellipower sector size 512e sectors manufacturers guarantee 36 months noise level operating 27 db noise level idle 26 db power consumption operating 45 watt power consumption idle 51 watt height 261 mm