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Date:      Mon, 31 Jan 2005 08:44:23 +0000
From:      Mark Ovens <marko@freebsd.org>
To:        rax@rakhesh.com
Cc:        Joe Kraft <hishadow@netcabo.pt>
Subject:   Re: Booting FreeBSD-5.3 from NTLDR
Message-ID:  <41FDEFE7.1090204@freebsd.org>
In-Reply-To: <38b3f6e4050130235957c049c2@mail.gmail.com>
References:  <38b3f6e40501292247696b96b@mail.gmail.com> <38b3f6e4050129231132f8e743@mail.gmail.com>	 <41FCA314.3070602@netcabo.pt> <38b3f6e4050130033551e43818@mail.gmail.com> <20050130120618.GA21695@alzatex.com> <38b3f6e4050130235957c049c2@mail.gmail.com>

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Rakhesh Sasidharan wrote:
>> No, boot0 is just a normal file that is 512 bytes long.  There is
>> nothing special about it.  In it is a bootloader program that can be
>> used to boot FreeBSD, and if you run it during boot, it will read the
>> partition table and look for all OSes.  I think it will modify the
>> partition table, though, marking the last OS you booted into, but that's
>> the program running doing that, the file itself is harmless.
> 
> Ok. I must have used some other command then, which resulted in my
> first disk MBR getting over-written ... strange. :-/
> 
> By the way, does the fact that NTLDR is on my first disk, while
> FreeBSD (and hence its MBR boot0) is on my second disk complicate
> matters? I mean, you mention boot0 will modify my partition table to
> reflect which OS was booted last -- will it by any chance modify the
> partition table on the first disk and hence mess it?
> 
> 

Yes and yes, 
http://www.freebsd.org/doc/en_US.ISO8859-1/books/faq/disks.html#NT-BOOTLOADER

Regards,

Mark


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