See http://www-03.ibm.com/ibm/history/reference/glossary_k.html

kilobyte (KB) 1. n. For processor storage, real and virtual storage, and 
channel volume, 2**10 or 1024 bytes. 2. n. For disk storage capacity and 
communications volume, 1000 bytes. 
 

-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of R.S.
Sent: Tuesday, July 31, 2007 5:30 AM
To: [email protected]
Subject: Re: Usage of KB and KiB


Bruce Hewson wrote:
> Well Radoslaw,
> 
> As I said the original convention for disk was 1000 bytes = 1KByte.

No. There was no such convention. Possibly there was no convention at 
all, although IMHO the most popular convention was IT k=1024, while 
non-IT k=1000.

> M$ did not comply with that convention when they decided to show disk 
> usage in binary format 1024bytes=1KByte.

M$ used k=1024 for disks for many years. Legacy MS-DOS (or rather IBM 
PC-DOS!) used 1024 for many years.


> Only memory (not disk) was specified in binary (1024) convention.

Again no. And again, you miss other (non-disk, non-memory) aspects like 
tapes, networks, disk channels etc. etc.


> And then other groups mixed 1000 and 1024 together when they reported 
> usage.

I have never met 1000 and 1024 mix, like 1*1000*1024=1MB. Neither in M$ 
nor elsewhere. Do you know such case ?



-- 
Radoslaw Skorupka
Lodz, Poland


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