Once the related IFO file is damaged, this backup copy will come into effect to help the disc play normally. VIDEO_TS.BUP: It is a backup copy of the VIDEO_TS IFO file. VIDEO_TS.IFO: It is the information file that contains main control and playback information for the entire DVD, including titles, volume numbers, domains, subtitles, audio tracks, etc.

The VIDEO_TS folder is used to store movies files that is made up of 3 parts: IFO, BUP and VOB files. Normally, the AUDIO_TS folder is used to store audio files and there is nothing in it. When you insert a DVD disc on your computer and click to open it, there are 2 folders, Video_TS and Audio_TS.

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