The amount of hard disk space needed for storing DVR or NVR video can be affected by factors like DVR or NVR's compression technology, image resolution (how many pixels on each image), how many frames/images the DVR or NVR captures per second (fps)and how many hours of recordings to keep per day.
Even with the same compression algorithm, the amount of noise in the picture, the brightness, the movement of the objects alot of other factors will all impact the size of the video file.
This calculator provides an estimate, not an accurate projection, to be used by system integrators/installers as a reference in determining how much hard disk space to put into a DVR or NVR.
Please keep in mind, features like hard disk redundancy or raid configuration will further reduce the length of videos that can be stored by 50%.
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