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There are pressed (ie original) DVDs that do not pass the standard testing procedure, they have at least one FAIL for some parameters.
That is testing. The rest is approximations.
They are good as long as one uses only one drive, and only one software, and only one measure. Some people say 95% in nero. Perfect, be happy. But as long as the drives are required only to play DVDs that comply with the specs (ie only OKs, not a single FAIL), a particular disc may have playback problems on other systems. The drive manufacturers gave us a gift actually, as most drives can read also out-of-specs discs (I had once a DL with some 1300 PI for about the whole second layer, yet perfectly readable with no speed-down), but this is no guarantee.
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Born in the USB (not USA)
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