Hard disc based DVRs (Digital Video Recorder) recorded programs cannot be deleted.

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Video Engineering Practice Test: Projection Display Systems and Television Home Theaters — practice the complete quiz, review flashcards, or try a random question.

A projection display system is a specialized computer display that projects an enlarged image on a screen. They are commonly used in presentations.  Projection systems use three main technologies: DLP (Digital Light Processing): Uses a chip made of microscopic mirrors and a spinning color wheel to create an image. DLP projectors deliver sharp images, don't need any filters, have a better response time as well as 3D capabilities. LCD: Typically small reflective or transmissive panels illuminated by a powerful arc lamp source. A series of lenses magnifies the reflected or transmitted image... Show more

Hard disc based DVRs (Digital Video Recorder) recorded programs cannot be deleted.