Découvert en cherchant la valeur de lbs en kg:
man units
(...)
Prefix Name Value
Ki kibi 2^10 = 1024
Mi mebi 2^20 = 1048576
Gi gibi 2^30 = 1073741824
Ti tebi 2^40 = 1099511627776
Pi pebi 2^50 = 1125899906842624
Ei exbi 2^60 = 1152921504606846976
Before these binary prefixes were introduced, it was fairly
common to use k=1000 and K=1024, just like b=bit, B=byte.
Unfortunately, the M is capital already, and cannot be capitalized to
indicate binary-ness.
At first that didn't matter too much, since memory modules and disks
came in sizes that were powers of two, so everyone knew that in such
contexts "kilobyte" and "megabyte" meant 1024 and 1048576 bytes,
respectively.
What originally was a sloppy use of the prefixes "kilo" and "mega"
started to become regarded as the "real true meaning" when computers
were involved.
But then disk technology changed, and disk sizes became arbitrary
numbers. After a period of uncertainty all disk manufacturers
settled on the standard, namely k=1000, M=1000k, G=1000M.
The situation was messy: in the 14k4 modems, k=1000; in the 1.44MB
diskettes, M=1024000; etc.
In 1998 the IEC approved the standard that defines the binary
prefixes given above, enabling people to be precise and unambiguous.
Thus, today, MB = 1000000B and MiB = 1048576B.
In the free software world programs are slowly being changed to
conform. When the Linux kernel boots and says
hda: 120064896 sectors (61473 MB) w/2048KiB Cache
the MB are megabytes and the KiB are kibibytes.
-------------------------
On apprend tous les jours ;-)
Alain
--
------------------------------------------------------------
Dr Alain Empain <[EMAIL PROTECTED]> <[EMAIL PROTECTED]>
Bioinformatics, Molecular Genetics,
Fac. Med. Vet., University of Liège, Belgium
Bd de Colonster, B43 B-4000 Liège (Sart-Tilman)
WORK: +32 4 366 3821 FAX: +32 4 366 4122
HOME: rue des Martyrs,7 B- 4550 Nandrin
+32 85 51 23 41 GSM: +32 497 70 17 64
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