Hi and welcome to he forum, Stafford!
That media code seems to be not very well supported by the current firmware.
There is a later version you could try with.
http://www.firmwarehq.com/NEC/ND-3500AG/files.html
If that also fail, your only luck is to get another brand of media/media code.
SPTD is not the issue here. Usually you get issues with that driver only when reading discs. (Slow speeds).