Zettabyte

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Quantities of bytes
SI prefixes Binary prefixes
(IEC 60027-2)
Name
(Symbol)		 Popular
Usage		 Standard
SI		 Name
(Symbol)		 Value
kilobyte (kB) 210 103 kibibyte (KiB) 210
megabyte (MB) 220 106 mebibyte (MiB) 220
gigabyte (GB) 230 109 gibibyte (GiB) 230
terabyte (TB) 240 1012 tebibyte (TiB) 240
petabyte (PB) 250 1015 pebibyte (PiB) 250
exabyte (EB) 260 1018 exbibyte (EiB) 260
zettabyte (ZB) 270 1021 zebibyte (ZiB) 270
yottabyte (YB) 280 1024 yobibyte (YiB) 280

A zettabyte (derived from the SI prefix zetta-) is a unit of information or computer storage equal to one sextillion (one long scale trilliard) bytes. It is commonly abbreviated ZB.

Because of irregularities in the definition and usage of terms for byte multiples, the exact number can be either one of the following:

  • 1,000,000,000,000,000,000,000 bytes — 10007, or 1021.
  • 1,180,591,620,717,411,303,424 bytes — 10247, or 270.

Because of these irregularities, the term "zebibyte" has been proposed as an unambiguous reference to the latter value. (See binary prefixes.)


[edit] See also

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