I, and many others, have purchase hundreds of these from shop4tech, meritline, and supermediastore. They are genuine TY and this has been confirmed by Rima and others who know much more about media than we do. They are 4X media; the 3520 will burn them at 8X with decent results. When these are gone, that's it as they are discontinued and cannot last forever. I have scans below on many drives.