BenQ Dual DW1610 does bad writing on dvd+R media



Hi all, my Benq dw1610 is writing spoiled (useless) dvds. I have copied 10 DVD movies on equal number of DVD+R from Nextech without problems. Then I bought other cheaper DVDs (+R) and copied more movies: I got 17 of them correctly done (I can watch them) but 10 dvdc were spoiled (for a total of 27 recordings). What could be the problem? I have used Nero under windows and K3D under Linux. Please advice. Thanks. :sad: