I bought a 20 dl pack from amazon last month. I have been burning dvd data of all kind and no one have been damaged.I have tried with other brands before on my DELL Laptop 6400 and I can say that the 65% of the cases they failed (even at the minimum speed without any program loaded - including antivirus).Next Time, I will buy 50 for backups my photos and all other stuff because I trust on media saved on internet and portable media. External hard disk are usefull but not trusted 100% for some facts that I will not mention here.I hope this info can be usefull for you.