What is the Greatest Info Density? DNA Holds Record

[Archosaur]

What is the greatest theoretical information density?
I don't care if you can read the stored information or not.

From what I understand, DNA currently holds the record for information density.

 

[K^2]

DNA isn't even close. Highest density I've seen done experimentally is 1024 bits of data stored on a single 5CB (C₁₈H₁₉N) molecule. That's nearly 30 bits per atom on average.

 

[Archosaur]

...nearly 30 bits per atom on average.

Wow! How on Earth is it stored?!