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If I remember correctly the size of DNA is ~100MB

This statement doesn't make much sense to me. Is there a theoretical limit to the length of DNA, or do you mean that human DNA is ~100MB?

The human genome is about 6.4 billion base pairs, where each base pair is represented by the letters: Adenine (A), Thymine (T), Cytosine (C), and Guanine (G), i.e. 2-bits. 6,4 billion is then 6.4E9*2 = 1.28E10 bits = 1.28E10/8 bytes = 1600 MB. Or 800 MB if you count the bases as pairs of two.

Polychaos dubium's DNA is over 200 times as long as human DNA[0].

[0]: https://en.wikipedia.org/wiki/Polychaos_dubium

I obviously meant human DNA.

Thanks for doing the calculus however given that less than 1% of DNA actually has a coding role then it means that a human can be usefully encoded in 8MB.

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