Re: mbr dd'd

[chuck gelm <chuck@gelm.net>]

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kaushal wrote:
> hi,
>    My friends' system is in a critical situation.
> 	Hdd. is /dev/hdc.
> 	CD-WR is /dev/hdd.
> created a bootable linux iso img.
> 	MISTAKE part:
> dd if=iso.img of=/dev/hdc.Instead of hdd.
> 
> To retrive it back we tried the following:
> 
> 1.)lilo:
> 1st sector of the device doesn't has valid boot signature.
> 
> 2.)grub-install /dev/hdc
> the device doesn't has BIOS recognition.
> 
> though multiboot,tried out this :
> 3.)dd if=/boot/vmlinuz of=/dev/hdc  
> grub-install /dev/hdc
> the device doesn't has BIOS recognition.
> 
> 4.)backed up the /boot/grub
> copied the grub of another sys in the network,
> replaced the /boot/grub.conf with the backedup grub.conf(i.e old one)
> again grub-install failed with the same reason.
> 
> 
> Net connectivity is available.Is there anyway he can recover the mbr
> ?Other os is windows 2000.He did backup the entire data and the system
> is working fine now.
> 
> Desperately   waiting for a solution.
> 
> Thanks a lot in advance.
> 
> kaushal.

  Dear kaushal:

  I do not create a CD-ROM diskette from an .iso image using 'dd'.
I "burn" .iso images to CD-ROM using 'cdrecord'.
See attachment for an example bash script that copies
  an .iso image to CD-ROM diskette.

HTH, Chuck

[-- Attachment #2: burncd.sh --]
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#!/bin/bash
#
# /usr/local/bin/burncd.sh
#

cat /usr/local/bin/burncd.sh

echo ""
echo " First argument is <$1>."
echo "Second argument is <$2>."
echo ""

eject -t

if [ -n $1 ] ; then
 if [ -n $2 ] ; then
  cdrecord -v dev=0,0,0 fs=64M speed=$2 driveropts=burnproof $1
 else
  echo "Second argument is burn speed [1 - 52] and must not be null."
 fi
else
 echo ""
 echo "First argument is filename.ext and must not be null."
 echo ""
fi
mount /mnt/cdrom && ls -l /mnt/cdrom && umount /mnt/cdrom
echo $1
eject