Re: Help, the dog ate my MBR (Linux/Windows dual boot)

From	Paul <nospam@needed.com>
Newsgroups	comp.os.linux.setup, comp.unix.programmer
Subject	Re: Help, the dog ate my MBR (Linux/Windows dual boot)
Date	2011-07-22 14:28 -0400
Organization	A noiseless patient Spider
Message-ID	<j0cfgr$clo$1@dont-email.me> (permalink)
References	<4e28ac1d$0$14975$426a74cc@news.free.fr> <98rop8FroiU6@mid.individual.net> <4e28b5a4$0$13068$426a74cc@news.free.fr> <j0ad9i$k1m$1@dont-email.me> <j0c1f6$8gl$1@dont-email.me>

Cross-posted to 2 groups.

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Noob wrote:
> Paul wrote:
>> Noob wrote:
>>> Ian Collins wrote:
>>>> Noob wrote:
>>>>
>>>>> Something trashed my MBR. Now when I boot the PC,
>>>>> I get the dreaded "NON-SYSTEM DISK. PLEASE INSERT
>>>>> SYSTEM DISK AND PRESS ENTER" (or something close).
>>>> Boot off a live or repair CD and fix grub.
>>> OK, I have a Fedora 15 live CD (XFCE spin).
>>>
>>> How do I "fix grub" and how is the tool going to
>>> figure out the partition table, considering that
>>> the MBR is now corrupt?
>> If you want to "recompute" the primary partition table,
>> try "TestDisk". Available for multiple platforms.
> 
> Thanks Paul, I don't need to recompute the partition table,
> because I know what it was set to:
> 
> 80 20 21 00 07 fe ff ff 00 08 00 00 00 00 00 0a
> 00 fe ff ff 83 fe ff ff 00 08 00 0a 00 00 38 04
> 00 fe ff ff 82 fe ff ff 00 08 38 0e 00 e8 17 00
> 
> Regards.

If you are omniscient, you can simply use a hex editor,
prepare what you think is a good looking 512 byte MBR
and write it back with "dd".

    sudo dd if=I_did_it_my_way.dd of=/dev/hda bs=512 count=1

and so on.

I'm a little worried though, as to what else in the first
63 sectors, got "bumped along" by your 14 byte shift. How
will you determine what else was damaged ?

I would back up the disk first, before going further. Again,
I use "dd" for that, and walk away until it is finished.

    Paul

Thread

Help, the dog ate my MBR (Linux/Windows dual boot) Noob <root@localhost> - 2011-07-22 00:45 -0400
  Re: Help, the dog ate my MBR (Linux/Windows dual boot) Ian Collins <ian-news@hotmail.com> - 2011-07-22 10:50 +1200
    Re: Help, the dog ate my MBR (Linux/Windows dual boot) Noob <root@localhost> - 2011-07-22 01:26 -0400
      Re: Help, the dog ate my MBR (Linux/Windows dual boot) Paul <nospam@needed.com> - 2011-07-21 19:38 -0400
        Re: Help, the dog ate my MBR (Linux/Windows dual boot) Noob <root@127.0.0.1> - 2011-07-22 16:29 +0200
          Re: Help, the dog ate my MBR (Linux/Windows dual boot) Paul <nospam@needed.com> - 2011-07-22 14:28 -0400
      Re: Help, the dog ate my MBR (Linux/Windows dual boot) g.fink@gmx.net (Gernot Fink) - 2011-07-22 04:35 +0000
  Re: Help, the dog ate my MBR (Linux/Windows dual boot) Mike Easter <MikeE@ster.invalid> - 2011-07-21 19:20 -0700
    Re: Help, the dog ate my MBR (Linux/Windows dual boot) Noob <root@127.0.0.1> - 2011-07-22 11:00 +0200
      Re: Help, the dog ate my MBR (Linux/Windows dual boot) GangGreene <GangGreene@invalid.com> - 2011-07-22 05:29 -0400
        Re: Help, the dog ate my MBR (Linux/Windows dual boot) Noob <root@127.0.0.1> - 2011-07-22 12:01 +0200
          Re: Help, the dog ate my MBR (Linux/Windows dual boot) g.fink@gmx.net (Gernot Fink) - 2011-07-22 10:28 +0000
  Re: Help, the dog ate my MBR (Linux/Windows dual boot) "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2011-07-21 23:33 -0400
  Re: Help, the dog ate my MBR (Linux/Windows dual boot) BGB <cr88192@hotmail.com> - 2011-07-21 21:26 -0700
  Re: Help, the dog ate my MBR (Linux/Windows dual boot) Noob <root@127.0.0.1> - 2011-07-22 16:25 +0200
    Re: Help, the dog ate my MBR (Linux/Windows dual boot) Bob Willard <BobwBSGS@TrashThis.comcast.net> - 2011-07-22 12:17 -0400
      Re: Help, the dog ate my MBR (Linux/Windows dual boot) Noob <root@127.0.0.1> - 2011-07-22 18:35 +0200
    Re: Help, the dog ate my MBR (Linux/Windows dual boot) Arno <me@privacy.net> - 2011-07-22 18:41 +0000
    Re: Help, the dog ate my MBR (Linux/Windows dual boot) Paul <nospam@needed.com> - 2011-07-22 14:52 -0400
      Re: Help, the dog ate my MBR (Linux/Windows dual boot) The Natural Philosopher <tnp@invalid.invalid> - 2011-07-23 02:23 +0100
    Re: Help, the dog ate my MBR (Linux/Windows dual boot) scott@slp53.sl.home (Scott Lurndal) - 2011-07-22 19:19 +0000
      Re: Help, the dog ate my MBR (Linux/Windows dual boot) Noob <root@127.0.0.1> - 2011-07-23 20:51 +0200
        Re: Help, the dog ate my MBR (Linux/Windows dual boot) Noob <root@127.0.0.1> - 2011-07-24 16:54 +0200
        Re: Help, the dog ate my MBR (Linux/Windows dual boot) Arno <me@privacy.net> - 2011-07-24 15:29 +0000
          Re: Help, the dog ate my MBR (Linux/Windows dual boot) Noob <root@127.0.0.1> - 2011-07-27 11:36 +0200
            Re: Help, the dog ate my MBR (Linux/Windows dual boot) The Natural Philosopher <tnp@invalid.invalid> - 2011-07-27 12:13 +0100
            Re: Help, the dog ate my MBR (Linux/Windows dual boot) scott@slp53.sl.home (Scott Lurndal) - 2011-07-27 20:48 +0000
              Re: Help, the dog ate my MBR (Linux/Windows dual boot) Noob <root@127.0.0.1> - 2011-07-28 10:43 +0200
              Re: Help, the dog ate my MBR (Linux/Windows dual boot) Jonathan de Boyne Pollard <J.deBoynePollard-newsgroups@NTLWorld.COM> - 2011-07-29 00:49 +0100
    Re: Help, the dog ate my MBR (Linux/Windows dual boot) Ian Collins <ian-news@hotmail.com> - 2011-07-23 09:44 +1200
    Re: Help, the dog ate my MBR (Linux/Windows dual boot) Franc Zabkar <fzabkar@iinternode.on.net> - 2011-07-23 10:05 +1000
      Re: Help, the dog ate my MBR (Linux/Windows dual boot) Paul <nospam@needed.com> - 2011-07-22 20:58 -0400
        Re: Help, the dog ate my MBR (Linux/Windows dual boot) Franc Zabkar <fzabkar@iinternode.on.net> - 2011-07-23 11:31 +1000
          Re: Help, the dog ate my MBR (Linux/Windows dual boot) Jonathan de Boyne Pollard <J.deBoynePollard-newsgroups@NTLWorld.COM> - 2011-07-29 01:18 +0100
        Re: Help, the dog ate my MBR (Linux/Windows dual boot) Franc Zabkar <fzabkar@iinternode.on.net> - 2011-07-23 19:02 +1000
        Re: Help, the dog ate my MBR (Linux/Windows dual boot) Jonathan de Boyne Pollard <J.deBoynePollard-newsgroups@NTLWorld.COM> - 2011-07-29 01:37 +0100
      Re: Help, the dog ate my MBR (Linux/Windows dual boot) Franc Zabkar <fzabkar@iinternode.on.net> - 2011-07-23 17:34 +1000
      Re: Help, the dog ate my MBR (Linux/Windows dual boot) Noob <root@127.0.0.1> - 2011-07-23 21:25 +0200
        Re: Help, the dog ate my MBR (Linux/Windows dual boot) Franc Zabkar <fzabkar@iinternode.on.net> - 2011-07-25 08:15 +1000
          Re: Help, the dog ate my MBR (Linux/Windows dual boot) scott@slp53.sl.home (Scott Lurndal) - 2011-07-24 23:08 +0000
            Re: Help, the dog ate my MBR (Linux/Windows dual boot) Franc Zabkar <fzabkar@iinternode.on.net> - 2011-07-25 09:46 +1000
              Re: Help, the dog ate my MBR (Linux/Windows dual boot) scott@slp53.sl.home (Scott Lurndal) - 2011-07-25 02:19 +0000
                Re: Help, the dog ate my MBR (Linux/Windows dual boot) Paul <nospam@needed.com> - 2011-07-24 22:38 -0400
                Re: Help, the dog ate my MBR (Linux/Windows dual boot) Franc Zabkar <fzabkar@iinternode.on.net> - 2011-07-25 19:38 +1000
                Re: Help, the dog ate my MBR (Linux/Windows dual boot) Franc Zabkar <fzabkar@iinternode.on.net> - 2011-07-25 19:34 +1000
            Re: Help, the dog ate my MBR (Linux/Windows dual boot) Michael Press <rubrum@pacbell.net> - 2011-08-03 21:56 -0700
              Re: Help, the dog ate my MBR (Linux/Windows dual boot) John Hasler <jhasler@newsguy.com> - 2011-08-04 08:15 -0500
      Re: Help, the dog ate my MBR (Linux/Windows dual boot) Jonathan de Boyne Pollard <J.deBoynePollard-newsgroups@NTLWorld.COM> - 2011-07-29 01:10 +0100
    Re: Help, the dog ate my MBR (Linux/Windows dual boot) gordonb.22upl@burditt.org (Gordon Burditt) - 2011-07-23 17:15 -0500
    Re: Help, the dog ate my MBR (Linux/Windows dual boot) Noob <root@127.0.0.1> - 2011-07-24 16:42 +0200
    Re: Help, the dog ate my MBR (Linux/Windows dual boot) Noob <root@127.0.0.1> - 2011-10-27 11:13 +0200
      Re: Help, the dog ate my MBR (Linux/Windows dual boot) Arno <me@privacy.net> - 2011-10-27 15:24 +0000
        Re: Help, the dog ate my MBR (Linux/Windows dual boot) Noob <root@127.0.0.1> - 2011-10-28 11:06 +0200
  Re: Help, the dog ate my MBR (Linux/Windows dual boot) Jonathan de Boyne Pollard <J.deBoynePollard-newsgroups@NTLWorld.COM> - 2011-07-29 00:49 +0100
    Re: Help, the dog ate my MBR (Linux/Windows dual boot) Noob <root@127.0.0.1> - 2011-08-01 11:27 +0200
      Re: Help, the dog ate my MBR (Linux/Windows dual boot) Nico Kadel-Garcia <nkadel@gmail.com> - 2011-08-06 10:00 -0700

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