In reply to ow arm:
> is it a dvd rw? Just wondering if youve already burnt that on?
Yes it's RW but I've erased and formatted it.
> other thing to check is if the software is actually burning to the disc and not set to do a test burn / simulated write?
> what 3rd party software is it? Nero is usually pretty reliable
CDBurnerXP. I can't load my old version of NERO which I had on Windows XP. Now got Windows 8