(The storage server software realizes the unified storage of surveillance video data. It obtains the video data stream by directly connecting the device or through the streaming media server, and saves it in the pre-allocated disk space in the form of data blocks, and saves the video through the index file of the disk data. Data information. At the same time, there is a built-in VOD server, and a remote query interface for video data is provided to realize remote on-demand video data.)