A DVR card seems quite some to the general computer video card in many computers. but, when it comes to performance, there are a lot of dissimilarity between them. DVR cards come with software that can be used to display and record information from multiple cameras at the same time. These are installed in computers to allow them to function as digital video recording systems.

DVR cards are generally used in observation systems to process the information received from a source such as a camera and pass it on to a storage device like a hard drive. In such a set up, there is more than one video out port. At these ports, the output from the safety cameras is plugged in to the card. one time installed inside a computer, the card becomes active and is instantly recognized by the machine thanks to the accompanying software. Once properly installed, this card allows the user to digitally record signals on to his hard drive and then view it instantaneously.

Depending on require, you can also select the quality of storage. DVR cards frames per second ranges are 30, 60,120,240 and 480. The fps also determines the time for which recording can be done. For a hard disk having 80 GB disk space, at 30 fps one can record for 320 hours. Likewise, at 120 fps, for an 80 GB hard disk drive, one can record for up to 80 hours. If you have a 960 GB hard disk.