With technology advancing all the time digital recording is becoming more dominant in the market place. Most digital video recorders (DVR's) are PC based but not all of them. The way digital recording works is by a taking analogue images from a cctv camera, digitise them and store them electronically on a media storage device usually a hard disk drive as used in most personal computers.
Due to the increasing size of hard disk drives and the quantity being produced, DVR's are coming down in price and manufacturers are constantly vying with each other to give more features to the end user. Features include real time, high resolution recording for each camera, instant time and date access to recorded images and motion detection functions. Features such as these are pushing CCTV to greater heights such as facial recognition.