Terms of Use: The calculator provides the estimation of possible HDD size consumed by Swann Communications Ltd - DVR's under the specified general conditions. It is purely for reference purpose. Your result might be very different from it due to different scene complexity, lighting conditions, weather, environmental. Swann Global Ltd assumes no responsibility for any consequences that may arise from the use of this calculator. Please seek professional advice from one of our trained product specialist online or at your nearest Swann reseller.