DVTR is a medium/instrument used to real time record various voice communications used by Air Traffic controllers and other personnel in support for Air Traffic Management and provides evidence for incident or accident investigations. The media has evolved from analog magnetic tape to digital media, engineers adapted magnetic tape technology to digital recording, producing digital reel- to-reel magnetic tape machines. Before large hard disks became economical enough to make hard disk recorders viable, studio digital recording meant recording on digital tape. 


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