On page 2 it clearly states:
Quote:
BookType (Bitsetting):
The NEC ND-4551A supports Bitsetting, and will as default write DVD+R DL media with DVD-ROM BookType.
Here is how you can check if your discs are really written with the DVD-ROM BookType:
Start Nero CD-DVD Speed and click the Disc info tab and you should get something like this
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On the conclusion:
Quote:
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No Bitsetting support (BookType - DVD-ROM) on DVD+R/RW media
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