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.