Hi there, thanks for the reply
the clear button trick is a great idea but unfortunately does not work and I can't get to the menu for the reformat command either because the disk is not even recognised - "no disk" in the display.
If I take a brand new disk from the tub, record on the Liteon, it recognises and plays fine on the Philips, will erase on the Philips, will then record on the Philips and then play back fine on the Liteon etc etc all that you would expect from a DVD+VR.
The thing that has my curiosity is that as soon as I erase on the Liteon it no longer is recognised on the Philips no matter what I try:
quick erase in nero
full (20 min) erase in nero
erase in nero then burn a ifo/vob normal movie dvd that plays on everything else, still a "no disk" in the Philips.
burn a standard iso dvd rom disk to see if that could be recognised and reformatted on the Philips.
the only thing I haven't tried is a clone dvd erase but can't really see how that could be much different from a nero erase.
Now here's the clincher - I took a Liteon erased disk, put it in a cheap Sumvision recorder, recognised fine, made a new recording on the Sumvision, erased the disk on the Sumvision.... back to the Philips.... still no disk!
Thus I was wondering if someone knows of a 'deeper' erase program similar to an unformat which might work? Surely the Liteon can't be marking a rom book bit or something because the disk is still recordable on other machines apart from the Philips. It's weird.