[cumbria_lug] verifying postal media

[Andrew]

Hi all,

Im new to the group, have been using Fedora for a while but largely as a
menial desktop user.

Does anyone have any suggestions about how you can verify the contents
of postal media (not downloaded ISOs) using the published checksums?

Ive tried creating an ISO from the postal media and verifying it but
this fails. This is either not the way to do it or ive got a bum disk :(

Any ideas please
Andy