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DVR Cards enable the user to convert their computer into a Digital Video Recorder. The DVR Card(s) is typically installed in an available PCI slot of a computer. DVR cards are bundled with video surveillance software which allows the user to record and display multiple cameras simultaneously from the camera site or a remote location.
A DVR card is the most recommended for long term surveillance. This will allow for motion activated recording, timer recording, remote access, and many other features. For laptops a USB capture card or USB DVR will connect via a USB port and provide very basic surveillance. you will then use the software that came with the USB hardware to record the video. What are the minimum requirements for a PC to be used with your DVR cards? Intel Pentium 3 Original Chipset 512Mb Ram 80Gb Hard Drive Why H.264 compression technology? The new industry standard H.264 compression technology is causing a revolution in the Video world, enabling higher quality, lower bit rates, lower system cost and new applications. New H.264 system provides the same low-latency video that has been delivered by traditional MPEG-4 based systems but with a reduction of up to 50% in bandwidth and storage requirement – or to put it another way, H.264 system can deliver significantly higher video quality for the same bandwidth – to save your internet resource(or higher transmission speed) and hard disk place also. Motion Detection Keep in mind however, that using motion detection can GREATLY reduce the hard drive use. The likelihood of your camera actually recording all day will be very slim. It may only record for a few hours per day on motion detection, making the figure more like less than 1Gb per day. 
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