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I knwo the security systems I have observed. (leaving off locations) use good ole fashion vhs tapes. each tape is ran ALL day. They use a different tape everyday. And each tape once a month. The replace ALL 31 tapes every year. But, come December, these things look liek crap.
Another reason for choppyness is that they are not continuously recording, they are skipping a 1/4 sec to save space.
I have also worked at places that have cameras mounted that have LED lights and move side to side... but they are fake cameras.
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