Just to make things clear for everybody : the original question was
about testing defects on blank discs and you decided to mention special
test equipment in your first reply. Unfortunately you chose to add
a picture of a bler plot, which precisely cannot be obtained with
a blank disc.
When I pointed out that this plot was not matching the question, you
edited your copy of the picture and removed the "BLER" word from it.
For reference, the original picture is at
What exactly is the point of this modification ? Just removing the
legend doesn't make your post correct and can only confuse people
reading this thread. If I now tell you that I can still recognize
a CATS BLER plot from the scale on the right, will you further
edit the picture ?