> It means if you get a result, you can't trust it

OK, fair enough

My natural curiosity just wants me looking for evidence
and symptoms. I try not to give up until I find out what
the underlying cause of the problem is. Maybe the card
is just poor-quality which might have died in someone's
camera and been binned with a shrug and a sigh

I suppose you could liken this to a bad pixel on an LCD.
There is no external electronic access to that pixel to fix it
or replace it with another

Joe


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