The blanks cause any problems if they are not quite full. At maximum capacity, it is more common that the end of a film can not be read. So you could say that the last external centimeters worries. I have always adhered to the burn rate of 4-fold and in direct comparison with the Verbatim blanks (also 4-fold) available at the MediaRange much more committee. The Verbatim ran until now always, even at maximum load.