Some more recent DVD players, and also the Sony PlayStation 2, can play discs recorded in the DVD-VR format.
The DVD-VR standard defines a logical format for recording and editing of video on a DVD disc.
Unlike standard DVD-Video recordings, the aspect ratio (4:3 or 16:9) is contained in the .VRO file itself as part of the video stream.
If one does not care about edits (e.g., deleting recorded videos), one can play the VRO directly as if it were a standard DVD-Video VOB file.
Packet writing technology is used to allow random access to, and incremental updating of the optical media.