Well you TRIED. And that was my invitation to you.

Now go down the Vegas Timeline route and make up batches of 2 hours at a time ( as per Cheema). As you won't have any fxs or trannies or whatever, Vegas SHOULD rip through these. Use the DVDA Video only stream only template and the AC3 encoding. You may also wanna try creating an interim AVI and render from your timeline - this is what I do. Once you DO have the BIG single AVI, Vegas will rip through this in greater than real time.

And as I suggested, IF you had a DVD Recorder it would remove all this faffing about.

I have used DVDShrink and have it found it removes anything from the authoring?

So, go via Vegas instead.

Grazie