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Moving a Petabyte of Data
Data Communications Networking Petabyte Storage Data Management Principles: The CEO Perspective. In a recent speech I asserted it was faster to send a petabyte of data from San Francisco to Hong Kong by sailboat than by the Internet. I got quite a few "how can that possibly be true?" kinds of questions, so here's the math.

By Jonathan Schwartz
In a recent speech I asserted it was faster to send a petabyte of data from San Francisco to Hong Kong by sailboat, than by the Internet.

I got quite a few "how can that possibly be true?quot; kinds of questions, so here's the math. (Full disclosure, I am a mathematician by training, which guarantees me a lifetime of small "off by one" errors in all subsequent calculations. So if I get something wrong, be gentle).

A petabyte is a thousand terabytes, which is a million gigabytes, or a billion megabytes. Or eight billion megabits. With me so far?

So if you had a half megabit per second Internet connection, which is relatively high in the U.S. (although relatively low compared to residential bandwidth available in, say, Korea), it'd take you 16 billion seconds, or 266 million minutes, or 507 years to transmit the data. Can you sail to Hong Kong faster than that? At a full megabit, just divide the time in half. Even at 100 megabits (about the highest, generally available, of any carrier I've seen), it's only a few years.



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