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Date: Sat, 24 Nov 2012 20:06:49 -0700 (MST)
From: Warren Block <wblock@wonkity.com>
To: Ralf Mardorf <ralf.mardorf@rocketmail.com>
Subject: Re: How to create a partition for FreeBSD 9.0?
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On Sat, 24 Nov 2012, Ralf Mardorf wrote:

> I use the amd64 install DVD.
>
> With or without deleting, I can't format a bootable FreeBSD partition to
> ada0s1, aka Linux /dev/sda1. FWIW if I reinstall GRUB legacy
> to /dev/sda, the boot flag will be set for the extended
> partition. /dev/sda1 is an empty ext3 partition, size 57.83 GiB.

Delete it, or set it to type 0xa5.  I think the first is probably better 
for bsdinstall to see it as available.  Expect boot loaders to be 
overwritten, so make a backup, preferably of everything.