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Human thought crawls at 10 bits per second, Caltech study finds
(www.techspot.com)
This is a most excellent place for technology news and articles.
It's a bit like asking what is the difference between the letter "A" and ink on a page in the shape of the letter "A". Of course, first one would have to explain how they are usually not different at all.
BTW, I don't know what you mean by "external storage data". The expression doesn't make sense.