Thanks for your reply BD - and maybe I'll understand it a bit better after I get some more experience.
In the meantime however can you elaborate a bit more on exactly what you mean by " You can extract the contents of an .iso using Winrar"
Briefly, how do you do this with WinRAR? Is there a menu/buttom that you use on the ISo file that extracts it (and into what???)?
When I think of 'extracting' a file(s) I think of uncompressing the file back into its original form so I'm not sure how to apply this to the ISO (and therefore confirm that it is a good copy).
Many thanks and regards.