I have now burned about 180 blanks, and not had a failure. It is certainly due to the Equitment and the programs that you use! I eg Brenne with a Panasonic Blue Ray burner, and so far had no problems even with these blanks. Unfortunately I can not provide information because the elders about 7 months old but still works properly over the life of the blanks. What can I say I am pleasantly surprised at the price. A little side note in the end I'm actually a customer and not any man of any has an advantage for a positive Rezesion.