Great suggestion Ian. I did some searching and found IsoBuster to be my best (and only) hope.
IsoBuster worked...well...sort of.
Initially, the disc looks like it is BLANK. I tried reading it on all sorts of different machines and they all whoed it was blank - including IsoBuster. Since the file info was never written to the disc, the 3+ hours of data never showed up.
I tried putting the DVD back into my VHS/DVD burner and recorded a few seconds - then hit STOP. This wrote file into to the disc and I was able to use IsoBuster to recover my data.