Nec nd3540a & dvd-r

Recently my Nec 3540A has taken to making DVD-R’s that wont play on my Sony standalone player. The discs play fine on the NEC and I have no problems with DVD+ media.

Any idea?

What info would you need to help me sort this out?

I think they were wrongly burned or authored.

How do I check that? All my DVD+ media seem to burn fine. I’ve updated the firmware but still no luck with dvd-

I’m a bit of a novice at all this. :o

If this is cheap -R media, the SONY will deny accepting it…

What kind of media is it…