Date: Sun, 19 Sep 2004 13:09:27 +0100 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: Abe Olson <bung-foo@comcast.net> Cc: freebsd-questions@freebsd.org Subject: Re: winxp freebsd dual boot with freebsd on second HD Message-ID: <20040919120927.GF51161@happy-idiot-talk.infracaninophile.co.uk> In-Reply-To: <414CD0D3.2030802@comcast.net> References: <414CD0D3.2030802@comcast.net>
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On Sat, Sep 18, 2004 at 05:20:35PM -0700, Abe Olson wrote:
> The instructions say:
> "Other operating systems, in particular Windows® 95, have been known to
> overwrite an existing MBR with their own. If this happens to you, or you
> want to replace your existing MBR with the FreeBSD MBR then use the
> following command:
>
> # fdisk -B -b /boot/boot0 device
>
> Where device is the device that you boot from . . ."
You have to do that to all bootable drives in your machine -- so
assuming your Windows disk is ad0 and your FreeBSD disk is ad2, you'ld
run:
# fdisk -B -b /boot/boot0 ad0
# fdisk -B -b /boot/boot0 ad2
In either case, you shouldn't need to rewrite the partition table.
See also boot0cfg(8) for a tool that lets you configure exactly how
the boot blocks work. Indeed, you can use boot0cfg(8) instead of
fdisk(8) to achieve your ends:
# boot0cfg -B -b /boot/boot0 ad0
# boot0cfg -B -b /boot/boot0 ad2
boot0cfg only ever affects the boot blocks; unlike fdisk it doesn't do
anything with partition tables, other than allow you to choose which
slices to boot from.
Note that the boot0 boot block is very minimal -- it fits into a
single 512 byte sector -- and that many people prefer 3rd party boot
managers like GAG: http://gag.sourceforge.net/ which, while quite a
bit bigger, have a much friendlier user interface.
Cheers,
Matthew
--
Dr Matthew J Seaman MA, D.Phil. 26 The Paddocks
Savill Way
PGP: http://www.infracaninophile.co.uk/pgpkey Marlow
Tel: +44 1628 476614 Bucks., SL7 1TH UK
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