1, video server is a specialized hardware device for recording, storing and managing video data. When equipped with a high-capacity hard disk, can work continuously for a long time, but also through the network or other communication methods to transmit video data.
2, DVR is a device that can record video and store it on the hard disk. It can realize real-time video recording, playback, editing and other functions, and can also transfer data through USB, HDMI and other interfaces.
3, hard disk recording unit is a kind of integrated recording and storage function of the hardware equipment, used for monitoring system. It can realize long time continuous recording, and also can transmit video data through network or other communication methods.