Zettabyte
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. 1,000,000,000,000,000,000,000 bytes = 10007, or 1021.
The term "zebibyte" (ZiB), using a binary prefix, is used for the corresponding multiple of 1024.
Comparisons for scale
A zettabyte is equal to 1 billion terabytes.
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, which, accordingly to Google's CEO Eric Schmidt was already reached in 2009.
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."
Translation
The word "Zettabyte" occurs as such in the following languages: English, Danish, Spanish, Basque, Italian, Norwegian (Bokmål), Portuguese, Simple English, Chinese.
Translation(s) in other languages: Arabic: زيتابايت, Belarusian (Taraškievica): Зэтабайт, Persian: زتابایت, Korean: 제타바이트, Marathi: झेट्टाबाईट, Japanese: ゼタバイト, Polish: Zettabajt, Russian: Зеттабайт, Serbian: Зетабајт, Thai: เซตตะไบต์, Tajik: Зеттабайт, Turkish: Zettabayt.
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