Desktop hard drive memory capacity 4 tb form factor 35 inch rpms 7 200 rpm buffer 64 mb bus sata iii sata 600 intellipower 5400 7200 rpm range series western digital purple suitable for 24 hour continuous operation video surveillance systems data transfer rate 150 mbs technology intellipower sector size 4 kb sectors manufacturers guarantee 36 months noise level operating 26 db noise level idle 25 db power consumption operating 48 watt