I guess there has been some misunderstanding, as packetloss mentions above. :iagree:
:disagree: There is NO way to tell how long a disc will live by looking at the original scan alone. Only comparisons between several scans performed at regular intervals can give any indication (if any). I insist on this point, as if you ever meet comments with lifespan expectations of a disc by looking at the original scan only, simply dismiss these comments, they would be from uninformed and/or unexperienced people.
The only case when original scans can maybe help in sorting out media in terms of life expectancy are by comparing scans of discs of the same MID and of the same batch.
In all other cases, some background about the MID used and its usual behavior in terms of stability is always needed to make any assumption. And even so, most of the time this will be mostly conjecture based on trends. Sometimes the way you handle and store you discs will be the most important factor.