A CCTV DVR recorder is at the heart of the best CCTV system. By means of a CCTV DVR recorder, images from CCTV cameras are recorded to be viewable later. So choosing the best CCTV DVR recorder for your budget is an important consideration. Our security DVR recorders range from 500GB to a whopping 16TB of hard drive capacity. The greater the hard drive capacity the longer the recording time before overwriting occurs. A very general rule of thumb for choosing the CCTV DVR's disk capacity is the following: A CCTV DVR recorder with a 1TB capacity will do 30 days of recording for 1 camera before overwriting occurs. So 4 cameras attached to a 1TB CCTV recorder will reduce the recording time to 1 week before overwriting occurs. If you know that your need a CCTV DVR recorder to have a maximum of 4 cameras then choose a CCTV DVR with 4 channels. If a maximum of 8 cameras will be installed on the security DVR recorder then a CCTV DVR recorder with 8 channels will be required.