A broken CD or DVD or other type of optical disc is a serious problem and one that will likely lead to loss of information stored on this media. A broken optical disc refers to a disc that has split into two or more pieces or perhaps a disc simply missing one piece.
A motion detector is a device that detects moving objects, particularly people. A motion detector is often integrated as a component of a system that automatically performs a task or alerts a user of motion in an area.
Active motion sensors (also called radar-based motion detectors) send out ultrasonic sound waves â the same waves used in pregnancy ultrasounds â and these waves reflect back to the sensor. This pattern continues until itâs disrupted by an interference of some sort (e.g. a person walking past).