Hello. Newbie here. I am using Nero6 and having problems Burning Dvds? I need to Copy 10 identical DVD-Rs, I have done all 10, 4 have been copyied ok and work fine, but the other six have been copyied and have the files on but won't play on my burner or home Dvd, I have checked the 6 disc and the files have been written? I have followed the the same procedure for all 10 disc, Why will only 4 play ok but not the other 6 not?