If you look at
it says the drive is "DVD-Multi"
if you then look at
which says part of the "DVD-Multi" spec is DVD-RAM
so it defnitely should read DVD-RAM.
I have now solved the problem. It appears to be the was nero creates the test disc, it is reported as CDFS, If I format the disc as UDF 2.0, and fill it via drag and drop the nero scandisc completes perfectly. UDF1.5 seems to work well too but not quite as well as UDF2.0.