Plextor PX-B310U Installation And User Manual page 44

Appendix A: PX-B310U and PX-B310SA Specifications
Q: What's the difference between "double layer" and "dual layer"?
A: Nothing, really. It's simply a difference of opinion within the industry
about how to label media and drive capabilities. DVD+R DL (as named
by the DVD+RW Alliance) stands for DVD+R Double Layer. DVD-R
DL (from the DVD Forum) stands for DVD-R Dual Layer. Whether
your DL media is labeled "double layer" or "dual layer," the PX-B310U
and PX-B310SA can handle it.
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PX-B310U/ PX-B310SA Installation and Users Manual