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.
Several types of motion detectors exist, including doorway sensors and driveway sensors. Most motion sensors are battery-powered, but some run on electricity. Electricity-powered motion sensors often get their juice from an existing structure, such as a light fixture.