Analog Camera / DVR
A DVR camera is a security system which links one or more cameras to a digital video recorder. It's main advantage is that it can record for much longer periods without the need to change tapes. The technology also means it is possible to review footage immediately while continuing to record.
If you've ever seen a device such as a TiVo, you'll be able to get a good idea how a DVR camera works. The input video is recorded to a hard drive rather than a video tape. Instead of connecting a cable or satellite box to the DVR, the user simply hooks up one or more cameras and records the feed.
Using a DVR camera overcomes one of the biggest limitations of a cassette-based recording system. Usually even the largest video tape recording at the slowest speed will be limited to eight hours recording time. This means that it's impossible to use the system for extended periods without somebody being on hand to change the tapes.
