|SI decimal prefixes||Binary
|IEC binary prefixes|
|kilobyte (kB)||103||210||kibibyte (KiB)||210|
|megabyte (MB)||106||220||mebibyte (MiB)||220|
|gigabyte (GB)||109||230||gibibyte (GiB)||230|
|terabyte (TB)||1012||240||tebibyte (TiB)||240|
|petabyte (PB)||1015||250||pebibyte (PiB)||250|
|exabyte (EB)||1018||260||exbibyte (EiB)||260|
|zettabyte (ZB)||1021||270||zebibyte (ZiB)||270|
|yottabyte (YB)||1024||280||yobibyte (YiB)||280|
|See also: Multiples of bits · Orders of magnitude of data|
The zettabyte is a multiple of the unit byte for digital information. The prefix zetta indicates the seventh power of 1000 and means 1021 in the International System of Units (SI), and therefore one zettabyte is one sextillion (one long scale trilliard) bytes. The unit symbol is ZB.
1 ZB = 1000000000000000000000bytes = 10007bytes = 1021bytes = 1000exabytes.
Comparisons for scale 
As of April 2012[update], no storage system has achieved one zettabyte of information. The combined space of all computer hard drives in the world was estimated at approximately 160 exabytes in 2006. This has increased rapidly however, as Seagate Technology reported selling 330 exabytes worth of hard drives during the 2011 Fiscal Year. As of 2009, the entire World Wide Web was estimated to contain close to 500 exabytes. This is one half zettabyte.
- The world's technological capacity to receive information through one-way broadcast networks was 0.432 zettabytes of (optimally compressed) information in 1986, 0.715 in 1993, 1.2 in 2000, and 1.9 (optimally compressed) zettabytes in 2007 (this is the informational equivalent to every person on earth receiving 174 newspapers per day).
- According to International Data Corporation, the total amount of global data is expected to grow to 2.7 zettabytes during 2012. This is 48% up from 2011.
- Mark Liberman calculated the storage requirements for all human speech ever spoken at 42 zettabytes if digitized as 16 kHz 16-bit audio. This was done in response to a popular expression that states "all words ever spoken by human beings" could be stored in approximately 5 exabytes of data (see exabyte for details). Liberman did freely confess that "maybe the authors [of the exabyte estimate] were thinking about text".
- Research from the University of Southern California reports that in 2007, humankind successfully sent 1.9 zettabytes of information through broadcast technology such as televisions and GPS.
- Research from the University of California, San Diego reports that in 2008, Americans consumed 3.6 zettabytes of information.
- Tom Burton (2008-01-31). "Zettabyte flood predicted for 2015".
- Lucas Mearian (2007-03-06). "A zettabyte by 2010: Corporate data grows fiftyfold in three years". Computerworld.
- Lucas Mearian (2008-03-11). "Study: Digital universe and its impact bigger than we thought". Computerworld.
- "Internet Traffic to Reach a Zettabyte by 2015, Says Study". 2008-01-31.
- Bret Swanson & George Gilder (2008-01-29). "The Impact of Video and Rich Media on the Internet – A ‘zettabyte’ by 2015?". Discovery Institute.
- John F. Gantz (March 2007). "An IDC White Paper: The Expanding Digital Universe" (PDF). EMC.
- Douglas Perry (2011-07-22). "The Average HDD is Now 590 GB in Capacity". Tom's Hardware.
- Richard Wray (2009-05-18). "Internet data heads for 500bn gigabytes". The Guardian.
- Martin Hilbert and Priscila López (2011-02-10). "The World’s Technological Capacity to Store, Communicate, and Compute Information". University of Vermont. Vol. 332 no. 6025 pp. 60-65
- Martin Hilbert (2011-06-11). "World_info_capacity_animation". Youtube.
- "IDC Predicts 2012 Will Be the Year of Mobile and Cloud Platform Wars as IT Vendors Vie for Leadership While the Industry Redefines Itself". IDC. 2011-12-01.
- Mark Liberman (2003-11-03). "Zettascale Linguistics". University of Pennsylvania. Retrieved 2012-07-31.
- Suzanne Wu (2011-02-10). "How Much Information Is There in the World?". University of Southern California.
- Roger E. Bohn & James E. Short (January 2010). "How Much Information? 2009 Report on American Consumers". University of California, San Diego.