1. 
   Zettabyte
   Unit of storage, details ...
   Found op http://www.cryer.co.uk/glossary/z/index.htm
   
   
2. 
   Zettabyte
   A rather large number of bytes. 10 to the power of 21 to be precise. People who use this term in conversation are likely to be quite insecure.
   Found op http://www.ft.com/dbglossary
   
   
3. 
   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. The term "zebibyte" (ZiB), using a binary prefix, is used for the corresponding power of 1024. ==Comparisons for scale== A zettabyte is e...
   Found op http://en.wikipedia.org/wiki/Zettabyte
   
   
4. 
   zettabyte
   (unit) 2^70 = 1,180,591,620,717,411,303,424 bytes = 1024 exabytes. See prefix. (1997-05-02)
   Found op http://foldoc.org/zettabyte
   
   

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