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Installing grub into the mbr of a disk image

From: Iwan Vosloo
Subject: Installing grub into the mbr of a disk image
Date: Thu, 17 Apr 2008 14:53:22 +0200

Hi there,

I'm trying to build a disk image, partitioned and with grub (0.97 on
ubuntu gutsy) in its mbr. But my installing grub always overwrites the
partition table.

The idea is to boot the disk image in a VM, then to land in grub's
commandline and take things from there. What am I misinderstanding?

These are the steps I follow to create a typical 4GiB image:
 1) Create the disk: dd if=/dev/zero of=/diskimage bs=516096c count=8000
20Linux )
    (assuming disk geometry of 8000 cylinders, 16 heads, 63
sectors/track, 512 bytes/sector) 
 2) Partition the disk:
    parted /diskimage -s  mklabel msdos
    parted /diskimage -s  mkpart primary ext3 32257B 1040cyl 
    parted /diskimage -s  mkpart primary linux-swap 1041cyl 9230cyl
    parted /diskimage -s  mkpart primary ext3 9231cyl 100%

 3) In order to install grub, I do:
    (from )
        dd if=/usr/lib/grub/i386-pc/stage1 of=/diskimage bs=512 count=1
        dd if=/usr/lib/grub/i386-pc/stage2 of=/diskimage bs=512 seek=1
- Iwan

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