Asking the same question three times is not going to get you an answer any quicker. Read the FAQ and the Tricks & Tips sub-forums - there are several articles in them to help diagnose disk burning problems.
Insanity is hereditary, you get it from your children
Here's the FAQ Neale is referring to.
If you'll post IN AS MUCH DETAIL AS POSSIBLE your results for each step in the troubleshooting process, we'll be better able to diagnose your problem and offer solutions.
And, as Neale says, it's very confusing when you post the same question several times. Every question gets read on this forum and solutions are offered whenever we can.
I've locked your other two discussions so you can confine your discussion to this thread. Thanks.
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Also see this ARTICLE on Transcoding for DVD/BD failures.
If PrE is not finding/seeing your multi-drive burner, then see this ARTICLE for some tips and fixes.
If nothing in those articles helps, then please post more details. This ARTICLE will point you in the right direction there.