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A Gigabyte is 10^9 bytes. 1,000,000 Gigabytes is 10^15 bytes. The prefix for 10^15 is Peta-, so one million Gigabytes would be one Petabyte. It tends to turn up in science fiction. The world's current fastest supercomputer, the IBM Roadrunner, has a memory capacity about a thousand times lower than this.

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