A "disc" is a flat round object, often made of plastic or metal, that is used for storing and playing music, movies, or computer data. It's commonly used for CDs, DVDs, or Blu-ray discs.Full definition
Passenger security is always assured thanks to various safety features, such as: dual front impact airbags, a security system, and 4 wheel disc brakes with ABS. (arlingtonheightscdjr.com)