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## [Bug-ddrescue] Math and Prefixes

 From: Chris Keeton Subject: [Bug-ddrescue] Math and Prefixes Date: Wed, 17 Jan 2007 20:17:42 -0600

I am one of those "Usamericans"(should be - US citizens, North Americans, or Americans) that would like to point out a serious error in logic by the person who wrote this man page.(info ddrescue: Invoking ddrescue, bottom of the page)
Yes we can read and understand basic math!! Please read the quoted excerpt below
"
#################################################################################
Table of SI and binary prefixes (unit multipliers):

Prefix   Value                     |   Prefix   Value
|   b        hardware blocks
k        kilobyte  (10^3 = 1000)   |   Ki       kibibyte (2^10 = 1024)
M        megabyte  (10^6)          |   Mi       mebibyte (2^20)
G        gigabyte  (10^9)          |   Gi       gibibyte (2^30)
T        terabyte  (10^12)         |   Ti       tebibyte (2^40)
P        petabyte  (10^15)         |   Pi       pebibyte (2^50)
E        exabyte   (10^18)         |   Ei       exbibyte (2^60)
Z        zettabyte (10^21)         |   Zi       zebibyte (2^70)
Y        yottabyte (10^24)         |   Yi       yobibyte (2^80)

NOTE: Don't believe everything Usamericans tell you. A billion is a
million millions (million^2), a trillion is a million million millions
(million^3), and so on. Please, respect the meaning of prefixes to make
communication among all people possible. Thanks.
#################################################################################
"

If this is a joke please make it a little more obvious; if not, then please use bc or any other calculator and/or dictionary to confirm the following:
A thousand is 1,000
A million is 1,000,000 (1,000 * 1,000 = 1,000,000 OR 1,000^2 OR 10^6)
A billion is 1,000,000,000 (1,000 * 1,000 * 1,000 = 1,000,000,000 OR 1,000,000 * 1,000 = 1,000,000,000 OR 1,000^3 OR 10^9)
A trillion is 1,000,000,000,000 (1,000 * 1,000 * 1,000 * 1,000 = 1,000,000,000,000 OR 1,000,000^2 OR 1,000^4 OR 10^12)

therefore according to normal logic (the logic that the rest of the world uses)

A billion is a thousand millions
A trillion is a million millions

Just to clarify the discrepancies:

A million millions (million^2) is a trillion NOT a billion!!
A million million millions (million^3) is a quintillion(1,000,000,000,000,000,000 OR 10^18) NOT a trillion!!

Please search (at least) wikipedia for definitions to such complicated terms before putting your own definitions in print.
Before you ask, nothing on my system was compiled with '-ffast-math'!!
Have a good day and please keep the documentation accurate, we all depend on it.

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