Now I'm really struggling with this one.
I need to replace a DVD burner as stated above.
I am confident that a replacement is necessary (apparently drive failure on this is not uncommon).
It is a 9mm drive and I cannot find a suitable replacement.
I have tried a Sony DW Q520A and a Sony DW Q58A, both stating that they are 9mm drives but they are both in fact 12mm.
It seems most drives are 12mm (or 12.7mm) even if they say 9mm.
I am in the UK but will buy from US if necessary.