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There are three common ways to control CCTV cameras, and to store their footage. These three devices are NVRs, DVRs, and Hybrids. They each are designed to handle certain types of cameras. All are designed with upgradeable hard drives as well, in case additional or longer term storage is required.
An NVR, or network video recorder, is a system for saving video recorded from IP security cameras. An NVR has the advantage that it does not have to be placed in a centralized location, it simply needs to be on the same network.
A DVR, or digital video recorder, is a device that processes and stores the video imagery from security cameras connected to it, which types are primarily AHD, HD-CVI, and SDI. These devices are not compatible with IP cameras, and vice versa.
A hybrid DVR is a one that can accept more than one type of video signal. The three most common video signals on the market today are AHD, HD-CVI, and IP. It is advantageous to have a hybrid DVR for many reasons, the most significant of which is to utilize existing AHD or HD-CVI cameras, while adding more advanced IP cameras or PTZ cameras to areas that need more detailed monitoring with clear digital zoom-in capabilities.