Bah,those 4x verbatums suxors with this drive.
weather its a booktype problem or whatever,I hope it gets fixed with a new firmware in future.
Ive always had better luck with -r's in home dvd players vs the +r's.
I didnt expect it to work here, which is why i only bought the 3 pack,because even with the new firmware from iggy dvddecrypter shows my 3540 doesnt support dvd-r dl ...it has a big "no" next tp it when checking capabilities.
Looks like I will go +r dl.