Digital disk recorder (DDR)

Computer disk systems that record digital video and generally intended as drop-in replacements for VTRs or as video caches to provide extra digital video sources for far less cost than a DVTR. They have the advantages of not requiring pre-rolls or spooling but they are not necessarily able to randomly access all video frames in realtime. DDRs can also offer the higher data rates needed for uncompressed recordings at an economic price, for SD as well as HD and 2K/4K (film) resolutions.

See also: Linear, True random access