user31559: So, 1 GHash equals 1000 Mhash's as far as I know. Then, why genesis-mining measures the bitcoin hashpower in terrahashes?? 1 Thash = 1000 Ghash. The whole hashocean is said to have 41.6 GH/s. On genesis you can buy 1 Thash for 400$. Who is naming their units in incorrect way? 

user5292: Your 41.6 GH/s is certainly wrong. According to https://bitcoinwisdom.com/bitcoin/difficulty it's currently 757,561,871 GH/s = 757,561 TeraHash/s.
Also: it's "Tera", one r and capital T. Capitalization is important in the Metric prefixes.  https://en.wikipedia.org/wiki/Metric_prefix
Note also that cloud mining is usually a scam. Why would they give you money? Answer: they don't.

user10405: As the network gets bigger, the reference hashpower for the whole network grows too. The bitcoin network is now in the petahash range and soon will be exahashes!
1000    k   kilo
1000^2  M   mega
1000^3  G   giga
1000^4  T   tera
1000^5  P   peta
1000^6  E   exa
1000^7  Z   zetta
1000^8  Y   yotta

31559: <p>So, 1 GHash equals 1000 Mhash's as far as I know. Then, why genesis-mining measures the bitcoin hashpower in terrahashes?? 1 Thash = 1000 Ghash. The whole hashocean is said to have 41.6 GH/s. On genesis you can buy 1 Thash for 400$. Who is naming their units in incorrect way? </p>
 5292: <p>Your 41.6 GH/s is certainly wrong. According to <a href="https://bitcoinwisdom.com/bitcoin/difficulty" rel="nofollow">https://bitcoinwisdom.com/bitcoin/difficulty</a> it's currently 757,561,871 GH/s = 757,561 TeraHash/s.</p>

<p>Also: it's "Tera", one r and capital T. Capitalization is important in the Metric prefixes.  <a href="https://en.wikipedia.org/wiki/Metric_prefix" rel="nofollow">https://en.wikipedia.org/wiki/Metric_prefix</a></p>

<p>Note also that cloud mining is usually a scam. Why would they give you money? Answer: they don't.</p>
 10405: <p>As the network gets bigger, the reference hashpower for the whole network grows too. The bitcoin network is now in the petahash range and soon will be exahashes!</p>

<p>1000    k   kilo</p>

<p>1000^2  M   mega</p>

<p>1000^3  G   giga</p>

<p>1000^4  T   tera</p>

<p>1000^5  P   peta</p>

<p>1000^6  E   exa</p>

<p>1000^7  Z   zetta</p>

<p>1000^8  Y   yotta</p>
