Skip site navigation (1)Skip section navigation (2)
Date:      Wed, 3 Aug 2011 02:01:51 -0500
From:      "Conrad J. Sabatier" <>
Subject:   Re: 8.2-RELEASE-amd64.iso weirdness (help!)
Message-ID:  <20110803020151.44ac6ada@serene>
In-Reply-To: <j1amge$dnq$>
References:  <20110802180606.4599d800@serene> <j1amge$dnq$>

Next in thread | Previous in thread | Raw E-Mail | Index | Archive | Help
On Wed, 03 Aug 2011 01:35:30 -0400, Michael Powell
<> wrote:

>Conrad J. Sabatier wrote:


>> Worse still, though, is what I ran across in the
>> partitioning/labeling/boot record section of sysinstall; no more
>> "dangerously dedicated" mode (unless you go into "expert" mode, which
>> is rather a mystery to me), and worse yet, it seems that the options
>> to install a plain master boot record or boot manager have no effect
>> whatsoever!
>"Dangerously dedicated" is being deprecated in favor of more modern
>ways and methods to slice and partition. You should no longer seek to
>utilize it, and I think, if memory serves there was some talk at one
>time on removing it from fdisk and/or sysinstall. 

Well, in 8.2, it *has* been removed essentially.  The only way to try
to effect a DD partitioning is to go into the mysterious and
error-prone "expert" mode, as it's no longer provided as an option in
the partitioning menu.


>> The really crucial problem I'm facing right now is that I can't get
>> Linux's damned "grub" off of my hard drive!


>Sounds like you need to zero the first part of your drive. The
>following is best done before installing, rather than afterwards.
>Either boot a LiveFS CD (which I have done before) or, I believe this
>is also possible from the Fixit shell (which I have not tried). In
>order to gain the ability to "force" writes to this area do this at a
>root prompt:
>sysctl kern.geom.debugflags=16
>then to zero out the beginning of your disk do:
>dd if=/dev/zero of=/dev/adx oseek=1 bs=512 count=1
>where x is the drive number. This should get the grub gone. Then
>install as normal. With the grub MBR out of the way you should now be
>able to install FreeBSD bootloader/MBR as you have in the past. 

I have already tried using dd to zero out the beginning of the drive,
just the MBR sector at first, then later even up to a full gigabyte, but
grub is still there.  I didn't, however, set that sysctl first.  Is that
why dd didn't work?  I'm not familiar with that particular setting.

I still don't understand, though, why sysinstall's option to install
the MBR didn't do the trick.  Neither the boot manager nor the
plain-vanilla MBR installation seemed to have any effect at all.

Anyway, thanks for the advice.  I'll keep trying.  I am determined to
get back to my beloved FreeBSD, which I had been using since 1996,
until this unfortunate situation occurred with my newly acquired
machine's (not so new anymore) hard drive and CD-ROM not being
recognized during attempts to install.

Will post back later on the results. I just hate to have to keep
trashing and then reinstalling Linux, just to get back online so I can
get more information about this seriously annoying problem.  :-)

Stay tuned!  :-)

Conrad J. Sabatier

Want to link to this message? Use this URL: <>