Block hashing calculations

o/

I'm learning about block hashing algorithm. I've found a very good beginner explanation here : http://bit.ly/2nMcBK8

But I struggle to understand why it still takes 10 minutes to find a block ! As I understand it, at the beginning of the race to find a new block, the only unknown is the nonce which is iterated to find a suitable sha256d hash.

So, a miner must iterate 2³² possibilities, which with an antminer S9 doing 14*10¹² iterations per second is near instant ...

What am I missing here ? If someone can explain that to me, I would be grateful !

Submitted October 05, 2017 at 04:48PM by Balistick http://bit.ly/2yJWQpO