i have used clone dvd & any dvd for years. Over the past 3 months i have been getting writedvd 10 11 w2 over & over. i know memorex & sony aren't the best but they have worked for me in the past. a friend of mine brought 3 memorex he had & they worked. my sister gave me some ridata disks & they work now but not for the others i have 175 discs that i cant get them to work.