—"IBM Unveils Storage Capacity on Demand for Growing e-businesses," Business Wire, October 27, 2000
PREFIX POWER UNITS NUMBER
OF 10
kilo- 3 thousands 1,000
mega- 6 millions 1,000,000
giga- 9 billions 1,000,000,000
tera- 12 trillions 1,000,000,000,000
peta- 15 quadrillions 1,000,000,000,000,000
exa- 18 quintillions 1,000,000,000,000,000,000
zetta- 21 sextillions 1,000,000,000,000,000,000,000
yotta- 24 septillions 1,000,000,000,000,000,000,000,000
All the numerical prefixes are defined by the International Standards Organization in a document called ISO 1000, "SI units and recommendations for the use of their multiples and of certain other units." (How's that for a mouthful of a title?) These prefixes are agreed upon by various committees, but there is some logic to their etymology. For example, tera- comes from tetra-, "four," because tera- represents 1,000 to the 4th power. Similarly, peta- is derived from penta-, "five," exa- comes from hexa-, "six", zetta- is a variation of the Latin septum, "seven," and yotta- is a variation of octo-, "eight."
Since a kilobyte is actually 1,024 bytes, a megabyte is 1,024 kilobytes, and so on, the above numbers don't accurately reflect the exact byte values represented by each unit. Here are the exact values: UNIT POWER ACTUAL BYTES
To put this in some perspective (or not), it would take approximately 86 trillion years to download a 1-yottabyte file, and the entire contents of the Library of Congress would consume a mere 10 terabytes.
OF 2
kilobyte 10 1,024
megabyte 20 1,048,576
gigabyte 30 1,073,741,824
terabyte 40 1,099,511,627,776
petabyte 50 1,125,899,906,842,624
exabyte 60 1,152,921,504,606,846,976
zettabyte 70 1,180,591,620,717,411,303,424
yottabyte 80 1,208,925,819,614,629,174,706,176
Source: www.wordspy.com
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