Instead of using an A-BEX disc, you can also run a limited version of the Error test by using a DAE test disc that you have previously created. In this case it is not necessary to create an image file, since Nero DiscSpeed already knows the content of the comparison disc. 
To run the test, proceed as follows:
1.
If there are several optical drives available, select the one you want in the drop-down menu.
2.
Insert a DAE disc in the optical drive.
3.
Click Extra > Advanced DAE Quality Test > Run Test.  
à
The Nero DiscSpeed – Advanced DAE Error Correction Test window opens. 
4.
Some optical drives show C2 errors in reverse order. If you want to correct this, enable the Reverse C2 check box.
5.
Click the Start button.
à
The test is run. You can cancel a running test at any time by clicking the Stop button.
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You can now see the results of the test in the graphs and the relevant displays and save them.
See also
Saving Test Data
Creating a Test Disc
A-BEX-Disc
An A-BEX disc is a test DVD that is used to test the error correction of an optical drive. For that purpose, the test DVD already comes delivered with defects such as scratches or fingerprints.
C2 errors
A C2 error describes the error rate on the lower layers of a burned CD that are automatically corrected during reading. Every recordable disc features these errors; the fewer they are, the better the quality. High C2 error rates indicate burn problems or quality flaws.
DAE quality
DAE (Digital Audio Extraction) refers to the process of reading audio files with a drive. DAE quality indicates how well a drive reads data on a CD.


Running the Test with a DAE Test Disc