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Date: Thu, 7 Jul 2005 09:10:54 -0400
From: "Jim C. Brown" <jma5@umd.edu>
Subject: Re: [Qemu-devel] fdisk give wrong number for losetup
Message-ID: <20050707131054.GA5461@jbrown.mylinuxbox.org>
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To: qemu-devel@nongnu.org

On Thu, Jul 07, 2005 at 12:36:08PM +0200, octane indice wrote:
> Hello
> 
> I have some trouble using losetup to mount partitions
> from the host.
> 

I never realized how difficult it was to interpret error messages written in
a foreign language.

> 
> And now, my questions: why this?
> 

Because you were passing the wrong value as the offset. You have to multipy
the cylinder with the number of heads and number of sectors per head and such.

> what's this number given by sfdisk: 516096 ?

Apparently, head*sectors per head*bytes per sector ... my fdisk doesn't show
that number though.

> fdisk doesn't give the good values?
> 
> thanks

It does, but they are hard to interpret unless you understand disk geometries.

I really recommend using lomount or some similar tool to figure out these
offsets for you. (Incidently, lomount doesn't care about disk geometry - it
uses the absolute sector values in the partition table.)

> 
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-- 
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Infinite precision begets infinite perfection.