linux-kernel - Re: PROBLEM: KB->KiB, MB -> MiB, ... (IEC 60027-2)

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Date:	Sat, 27 Jan 2007 16:06:32 +0100
From:	Andries Brouwer <aebr@....tue.nl>
To:	Michał Kudła <michal.kudla@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: PROBLEM: KB->KiB, MB -> MiB, ... (IEC 60027-2)

On Sat, Jan 20, 2007 at 09:08:47AM +0100, Michał Kudła wrote:
> Hello,

> after 
> ...
> hdb: max request size: 512KiB
> hdb: 488397168 sectors (250059 MB) w/8192KiB Cache, CHS=30401/255/63, 
> 
> Should be everywere KiB, MiB, GiB, ... according to IEC 60027-2 

You are mistaken. The MB here are actual megabytes (million bytes), not MiB.
Read the code, or do the computation: 488397168*512 = 250059350016.

(Precisely what one wants - the kernel gives the correct size,
just like the disk manufacturers, and there is no discrepancy.
Binary abuse for decimal prefixes is a sloppiness that might be
acceptable for stuff that naturally comes in powers of two.
It is long ago that that was true for disks.)

Andries
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