Alpine nvd-T005 copy

Hi folks. I am new and completely green. I need help. Does anyone know how to copy/backup my alpine nvd-T005 navigation disc? The stuff is expensive and it is a good idea to keep a back-up copy in reserve. Many thanks for assistance.

Have you try copy it normally with NERO or Alcohol?

No, but I tried with decrypter and created mirrows which I subsequently copied to verbatim dvd+r dl and again to verbatim dvd-r dl. Apparently seemed to copy very well but disc was not recognised by my Alpine INA-N033R Navigation System. Any specific suggestions? Thanks.

You will not get a working copy of that, this is the actual truth.

[QUOTE=chef;1935645]You will not get a working copy of that, this is the actual truth.[/QUOTE]
Hi Chef,
Are you saying these can not be copied by any known process?

You can - you already did.

But no one has made a working copy yet…AFAIK.

I reckon I’ve got to quit trying if there is no way of making a workable copy. Many thanks though.