Security DVR and NVR Record Time Calculator Use this calculator to calculate the required hard drive space you will need to achieve your desired record time. Most customers prefer to have at least 15 days of recording archived before the DVR/NVR starts recording over the oldest footage. Just input the specs of your system, desired record period, and the calculator will determine the size of hard drive your system needs. Keep in mind that you can substantially cut down on your hard drive requirements by enabling motion recording. H.264 Recorder Hard Drive Record Time Calculator Total days of stored surveillance footage? Total number of recorded security cameras? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 Recording Resolution? CIF (320 x 240) D1 (720 x 480) 960h (960 x 480) 720P (1280 x 720) 1080P (1920 x 1080) Recording Frame Rate? 30 Frames Per Second 20 Frames Per Second 15 Frames Per Second 10 Frames Per Second 7.5 Frames Per Second Custom FPS: Recording Mode? All Day Recording (24/7) Motion Recording How busy is your location? Constant activity, 90% Farily busy, 75% Business hours only, 50% Residential location, 25% Suggested storage space: Calculate Use Motion Detection Recording To Save Hard Drive Space All SCW DVRs and NVRs are capable of recording only after a motion event has been detected. A pre-record buffer can be set that will begin recording a set amount of time prior to the motion event. With these features you can manage your HDD space much more effectively and never miss an incident. Minimum Hard Drive Size Requirements As surveillance technology advances, camera sensors and record resolutions continues to increase. With higher resolutions comes the requirement of greater Hard Drive space to accommodate the increase in pixel data. With a Full D1 (30 fps) resolution recorder we would suggest a bare minimum of 1 Terabytes to achieve 14 days of recording for a 4 camera analog system. The size of your HDD would increase based on an increase of the number of cameras and/or an increase of the recording resolution. For example, a 4 channel 1080P HD system would require a minimum of 4 Terabytes to achieve 14 days of recording.