The -R/-RW discs you try to playback could be recorded in -VR/UDF formats.
The DVD-VR recording mode offers advanced editing feature but is not compatible with most DVD-Video players.
The UDF format is normally created using a computer and this format is not a DVD-Video format, hence the discs will not be playable in DVD players and recorders.
Please ensure that the discs are not recorded in the above formats when you have problems playing back -R/-RW discs.
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