Verbatim AZO Crystal CD-R: "orange peel" effect on top surface


I use Verbatim AZO Crystal CD-R to archive some important business data. I’ve just purchased a few spindles and I’ve noticed that the top surface of the discs looks pebbly, like an “orange peel”. The surface is apparently smooth to the touch, so the problem could be located at a lower layer.

Anyway, is it a serious issue? Are my data safe with these discs?