Memorex +rw disappears

Burnt this on my new 812 a few days ago and now I cannot playback on the same PC I created it on nor the standalone dvd player. Explorer will not even recognize the dvd. Here is a scan which I had to abort around 60% because it was running for hours. Is this a media or h/w issue? The other +RW (data) is still readable as were 2/3 dvd+r burns. I have attached the dvd+r scans is the Media forum

Kprobe thinks your DVD is larger than it can be. The max length for a single layer disk is is $230540 blocks. I your scan you can see green lines when this position is reached.
I just saw your firmware is quite old, get an update.