thank you very much!
all i wanted to know
my main problem is that i want to be sure that my dvds do run annd have no individual defects. and my 811s burns quickly (although i always use 4x, never 8x; did some 8x ricoh discs, that ran well, though, but i'm in quality... annd 8x always had much higher err rates...).
but to just make a file read test it takes as long as burning (my 811s reads a full dvd at 4.2x average) and a file test doesnt necessarily show a bad quality disc with spikes oder other anormalies in error rate spectrum. i will now get a liteon dvdrom, which is cheap and faster (i suppose it will be faster; at least an old 1502 toshiba reads my dvd+r's at 16max and that really blows so i suppost liteon dvdrom will do it quick, too)
and thank you for this nice forum here!
have a nice day