A digital video recorder (DVR) is an electronic device for recording videos in a digital format and storing them to USB flash drive, disk drive, SSD, SD memory card, and other mass storage device. A digital video recorder includes a set-top box with portable media players, digital camcorders and TV gateways. With these equipment, the recording capability of DVRs increases manifold. Personal video recorders are also quite popular as a consumer electronic device. Different types of digital video recorders are set-top boxes, VESA compatibility, integrated television sets, PC-based, Mac operating system and Windows.
Choosing the right DVR for the analog CCTV installation is important because the DVR forms the central hub of the surveillance system.
DVRs can record footage from the surveillance cameras in a number of different ways. The most popular is motion recording. This means when the DVR detects movement on a camera that camera’s footage will be recorded onto the hard drive of the DVR. The standard setting is to record from 10 seconds before, to 30 seconds after motion is detected. Motion recording tends to maximize hard drive storage space because the DVR is only recording when it detects activity.