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Re: [Qemu-devel] fdisk give wrong number for losetup
From: |
Jim C. Brown |
Subject: |
Re: [Qemu-devel] fdisk give wrong number for losetup |
Date: |
Thu, 7 Jul 2005 09:10:54 -0400 |
User-agent: |
Mutt/1.4i |
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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