Here's an excerpt from a buyer's guide on DVR Surveillance
DVR systems
Very similar in appearance and control functions to standard VCR recorders, are truly remarkable devices. Most video processing is done by hardware, therefore eliminating system crashes, video is also stored on hard drive in digital format.
The basic operating system, usually Linux, is permanently stored on special processor, witch is impossible to overwrite or corrupt. Designed and manufactured with single application in mind, it is by far better in performance and reliability to its PC based rival.
Some DVR systems will even have remote monitoring capability, useful when monitoring is required in different locations thru Internet or network.
Most important futures to look for when selecting the right DVR recorder are motion detection and frame speed.
The higher the frame speed the more fluent video recording. Motion detection will allow recording video from each camera only when motion is detected; this is great for extending video recording time...More Here
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