This "law" seems poorly thought out at best - you can really share information from your media. Consider a hard drive and a flash drive formatted in different file systems, but both of them contain exactly the same jpeg file. Both from the same original, a photograph of Mona Lisa, but have been oversampled and in no way identical on a binary level. What do they have in common?
In accordance with this law, absolutely nothing.
You probably can't find it, because I expect that this is not a real law - someone might have thought about it and thought it was smart and wrote it somewhere that you may have read later.
If I am wrong and just made my ass, please correct me.
Edit: also
"you cannot share information on a hard disk with the molecular structure of a hard disk"
Then how to accurately copy data from one hard drive to another without physically moving the molecular structure? Of course, the act of simply reading data performs this impossible task. What you may have been looking for is that information cannot exist without some kind of medium.
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