Sony DRXS50U - DRX S50U Operating Instructions Manual page 23

Further, because of the differences in quality and characteristics between
various DVD-ROM drive, DVD player, DVD+R DL disc, DVD+R disc,
DVD+RW disc, DVD-R DL disc, DVD-R disc, DVD-RW disc and DVD-
RAM disc manufacturers, playback may not be possible depending on the
combination. (Playback compatibility is not under warranty.)
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