Ian wrote:If I remember right, there was a German mag that did some tests and said that the DVD writer was more accurate. I think MediumRare posted that info. I could be wrong though.
I believe you are mistaken. MediumRare was with me regarding this matter the last time it came up for discussion. We both feel that there is, as of yet, no evidence one way or the other regarding the relative accuracy of Lite-On DVD burners and DVD-ROM drives when it comes to measuring PI/PO errors.
It is true that combo and DVD-ROM drives are less accurate than
CD-RW burners when it comes to measuring
C1/C2 errors. That is because they measure C1/C2 errors in cooked mode. But the only thing we can say about PI/PO measuring is that DVD burners and DVD-ROM drives will give
different results. For any given DVD disc, sometimes a DVD burner will report higher errors than a DVD-ROM drive, and sometimes it will report lower errors. But there is no way to say one or the other is more correct. For all we know both are correct, and the different results simply reflect the different reading characteristics of the two drives and their preferences/tolerances for different media types.
One thing that does make the DVD burners more useful for PI/PO testing is that they can test at a variety of reading speeds that the DVD-ROM drives can't.
As for MediumRare's summary of the German magazine article, I think you are recalling this post:
http://test2.cdrlabs.com/phpBB/viewtopic.php?t=12706
Note that the article did not even mention DVD-ROM drives, let alone test any, so no conclusions about DVD-ROM drives can be drawn from this article.
In a somewhat related topic, I don't know if anyone has done any comparisons to see how accurate the Lite-On DVD burners are at measuring C1/C2 errors.
And finally, always keep in mind that these tools are best for making relative comparisons of burn quality, and any absolute error levels reported from these tools should be taken with a grain of salt.
cfitz