Sorry it took so long to get back :doh:
However, even lousy media can be burned good (and watchable / copyable, etc) when the burning speed is dropped down to 4x to play it safe.
Out of a batch of Bulkpaq (for example), only one disc failed and had to be thrown away. Admittedly, this has p*ssed me off because this recording was vital and I can't recover it, recovery on software was abysmally poor...
Anyway, I've learnt my lesson and as these recordings were mainly VHS backups, it isint any loss if they get corrupted again. But caveot emptor, I'll reconsider Bulkpaq.