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Originally Posted by JohnnyCarson
Many retailers now use DVR's. You can generally have up to 16 cameras hooked up to one. You can get up to 6 months of video saved depending on quality. You can then just enter a specific date and time and the video for that time comes up. It can then be recorded on to a cd-r for the police or whoever. Very cool systems....
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16 channel was pretty much the original style.
I can now do unlimited cameras, unlimited storage (i.e. hard drices), all controlled and all video retrived through one interface. For example: The standard system for Target is unlimited/unlimited. Pretty sweet system made by a Colorado company called Loronix.
32 camera models are starting to become popular for smaller applications. Right now the limit for these systems is storage. It is easy to add cameras, making them work across different hard drives requires a little more work.