I have the blanks with 4X described (the blanks are given 6X but I always remain slightly below the maximum) and had on my LG burner no failures. Verify or manual back-copying the control brought no errors. The blanks make compared to the Panasonic blanks a better impression because they are thicker and have a more stable. (Perhaps because of the anti-scratch coating) but I had no problems with the Panasonic blanks. (This can, however, describe only with 2X)