malcolm
Thanks for the reply.
It looks like you are not the first Mac user to run into this issue.
I just started my day with some Google searches on this and found as first one....
DVD's not being copied on to HD's Error Code 36 | Apple Support Communities
This looks like a Mac issue whose core does not reside in one Mac operating system or in any particular software.
This error 36 seems to be looked at as a sort of generic error code.
Please let us know how you do with your searches on this. I will do some more Google searches too.
Thanks.
ATR