Zettabyte

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A zettabyte (symbol ZB, derived from the SI prefix zetta-) is a unit of information or computer storage equal to one sextillion (one long scale trilliard) bytes. ^[1][2][3][4]

• 1,000,000,000,000,000,000,000 bytes = 1000⁷, or 10²¹.

An alternative (rarely used) definition is^[5]

• 1,180,591,620,717,411,303,424 bytes = 1024⁷, or 2⁷⁰.

The term "zebibyte", using a binary prefix, has been proposed as an unambiguous reference to the latter value.

According to IDC, as of 2006 the total amount of digital data in existence was 0.161 zettabytes; the same paper estimates that by 2010, the rate of digital data generated worldwide will be 0.988 zettabytes per year.^[6]

A white paper released on March 11, 2008 from IDC revised the research firm's earlier estimates to show that by 2011, the amount of electronic data created and stored will grow to 10 times the 180 exabytes that existed in 2006, reflecting a compound annual growth rate of almost 60%.^[7]

By 2011, there will be 1,800 exabytes of electronic data in existence, or 1.8 zettabytes (an exabyte is equal to 1 billion gigabytes).

IDC also acknowledged that it underestimated earlier digital data figures for 2007, saying the actual amount of data — 281 exabytes — is 10% greater than it had previously forecasted in the first "Digital Universe" study. IDC said the bigger numbers were the result of faster growth in digital cameras and televisions, as well as a better understanding of data replication.^[8]

The Z in Sun's ZFS file system originally stood for zettabyte.

HP states that HP-UX 11i v3 "enables [...] 100 million zettabytes of storage",^[9] although the product release notes state that the maximum supported size for an individual filesystem is 40 TB (0.000 000 004 zettabytes);^[10] 25 quadrillion separate filesystems would be required to reach the stated number.

References

1. ^ Zettabyte flood predicted for 2015, Tom Burton (January 2008)
2. ^ A zettabyte by 2010: Corporate data grows fiftyfold in three years, Lucas Mearian (March 2007)
3. ^ Study: Digital universe and its impact bigger than we thought, Lucas Mearian (March 2008)
4. ^ Internet Traffic to Reach a Zettabyte by 2015, Says Study
5. ^ FOLDOC: Free On-Line Dictionary of Computing
6. ^ John F. Gantz; David Reinsel, Christopeher Chute, Wolfgang Schlichting, John McArthur, Stephen Minton, irida Xheneti, Anna Toncheva, Alex Manfrediz (March 2007). The Expanding Digital Universe: A Forecast of Worldwide Information Growth Through 2010. International Data Corporation, sponsored by EMC Corporation. Retrieved on 2007-11-28.
7. ^ John F. Gantz; David Reinsel, Christopeher Chute, Wolfgang Schlichting, Stephen Minton, Anna Toncheva, Alex Manfrediz (March 2008). The Expanding Digital Universe: An Updated Forecast of Worldwide Information Growth Through 2011. International Data Corporation, sponsored by EMC Corporation. Retrieved on 2008-03-12.
8. ^ Lucas Mearian (March 2008). Study: Digital universe and its impact bigger than we thought. ComputerWorld. Retrieved on 2008-03-12.
9. ^ HP-UX 11i v3 for HP Integrity and HP 9000 servers http://h20338.www2.hp.com/hpux11i/cache/458092-0-0-0-121.html
10. ^ HP-UX File Systems Architecture Enhancements. Hewlett-Packard. Retrieved on 2007-11-27. “In HP-UX 11i v3, customers using VxFs file systems will have support for larger file systems up to 40TB, and individual files up to 16TB.”

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