Pioneer DVR-X122 Operating Instructions Manual page 6

About DualDisc Playback – DualDisc is a new two-sided disc with one side containing DVD
video / audio / etc. content and the opposite side containing non-DVD content such as digital
audio material. The non-DVD audio side is not compliant with the CD Audio Specification;
therefore, may not play. The DVD side of DualDisc media plays in this unit. For more details
about the DualDisc specification, please refer to the disc manufacturer or your retailer.
Note: Some discs may not be playable due to different recording formats or the physical
condition of the disc at the time of recording or playback.
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