Those prefixes are:
Ki kibi 2^10
Mi mebi 2^20
Gi gibi 2^30
Ti tebi 2^40
Pi pebi 2^50
Ei exbi 2^60
Note that the symbol for kibi does start with an uppercase "K", unlike
the symbol for kilo. Also, the prefixes mebi, tebi, and pebi use "e" for
their first vowel. The "i" is always lower case (John had MI below).
And, as Bill pointed out, the spelled out prefix names start with
lowercase letters.
The Institute of Electrical and Electronic Engineers has prepared a
proposed standard (P1541) that parallels the IEC standard. Rather than
"binary prefixes", we are using the phrase "prefixes for binary
multiples". Balloting on that proposed standard is expected this spring.
The angstrom (my apologies for not taking the time to insert the proper
diacrits) is not deprecated; rather, its "use is not encouraged". The
angstrom stands higher in the brochure than the cgs units, for some
reason.
Jim
Bill Potts wrote:
>
> Unfortunately, John, you've put capital initials on all of the spelled-out
> binary prefixes. (I guess you must have been in German-speaking mode.)
>
> Just like the standard spelled-out prefixes, they should be lower case.
....
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
> kilopascal
> Sent: Saturday, January 05, 2002 21:44
> To: U.S. Metric Association
> Subject: [USMA:17252] Binary Prefixes
>
> 2002-01-06
>
> Dear Mr. Ross,
....
> To address the need for powers of 2 prefixes, the IEC in 1998 authorised a
> new set of prefixes to handle the powers of 2. These prefixes are similar
> to the SI prefixes, but are meant to be used when expressing capacity in
> powers of 2. The binary prefixes use the SI prefixes, kilo, mega, giga,
> tera, etc and contract them with the word "binary" to come up with Kibi,
> Mibi, Gibi, Tibi, etc. These prefixes are only to be combined with the
> units bit and byte (B). Thus a Kibibyte is 2^10 B, a Mibibyte is 2^20 B, a
> Gibibyte is 2^30 B, etc. The symbols are Ki, MI, Gi, etc.
....
> Also note that the unit Angstrom is not a proper SI unit and is deprecated.
> It is obsolete and is fast disappearing. In fact, I never hear or see it
> anymore, except in something old. The proper replacement is the nanometre
> equal to 10^-9 m.
....
--
Metric Methods(SM) "Don't be late to metricate!"
James R. Frysinger, CAMS http://www.metricmethods.com/
10 Captiva Row e-mail: [EMAIL PROTECTED]
Charleston, SC 29407 phone/FAX: 843.225.6789
