The second link on your other post wouldn't work.

Some rings are always possible because the LABEL is done just like the tracks, but just on the other side and the whole surface is processed.

I think, the drive may be a little out of calibration, causing more of a gap between tracks.

They are very small, I had to magnify the image to see them.

If they really bother you, you should have the drive's calibration checked and adjusted.