Anthony Thompson <thompson@...>
It is my understanding that a single 35mm black and white negativeSort of. This is ONLY true if the negative is crystal sharp. The great majority, especially 35 mm, are far from truly sharp. In such a case the INFORMATION content may not exceed 5 MB, regardless of how many silver grains there are.
The negative is also a much better way to store data archivally -I'd agree about the longevity of negatives--same is true of paper records. As for how long a CD will last, well, realistically, no one really knows yet. They certainly ARE subject to heat and humidity: you can add them to the very long list of things best stored in a cool, dry place. (inevitably reminds me of the great Traveling Wilburys song on that topic . . . )
Tony Thompson Editor, Signature Press, Berkeley, CA
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Publishers of books on railroad history