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by gist 3274 days ago
Thanks for this. I actually spent a bit of time playing around and learning about dd based on the above. I found that on my machine it is also slower as well. Never really had a need to use dd even with many years of playing with Unix.

This post appears to have the reason:

https://superuser.com/questions/359599/why-is-my-dev-random-...

(This raises the question of why using openssl (per other comment) makes it faster.)