Many thanks ccfj1 and Jochen. I have now reloaded the only OEM disc I can find which is v28 (SW 4-1/70). Has anyone UK based got an OEM later version such as v29 they would be prepared to sell me, I am reluctant to go above that as I suspect the addition of Dual Layer reading may just be one step too far for my aged laser - and me for that matter!