Digital video recorders (DVRs) have replaced VCRs as the workhorses of the video surveillance industry. While they are still somewhat more expensive than VCRs, their advantages are immense.
One of the most significant is their ability to adjust to what they see: if they're recording a static image, such as the inside of a warehouse at night, they may only record 1 frame every 5 or 10 seconds. But when they detect movement, they can instantly switch to full video to capture any suspicious activity.
Because they record to hard drives, you can instantly watch any specific time – no lengthy fast-forwarding and searching for the right moment. They also let you jump to 'events' – situations where the picture changed. And don't overlook the fact that they don't have tapes: you won't have to worry about storage or tapes deteriorating.
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