Such defective blanks are to me so far encountered no. From 10 blanks just 4 pieces were to use and also have this constantly, despite slow burning with 2x and 4x speed reading error and take forever be recognized by them. - Crashes during firing, - Versing and eternal recognition rape until then, that even the 2 blanks were exempt only by a reset of the PC from the burner (LG), such a thing is happening to me no other blanks. After I have made very bad experiences with Emtec CD blanks years ago, now the name Emtec is high on the list of blanks that I no longer guarantees will try With blanks from TDK, Sony, Philips and Verbatim I've had a good experience and would recommend this with a clear conscience. But definitely stay away from this one!