Date: Fri, 14 Apr 2006 11:13:27 -0500 From: Doug Poland <doug@polands.org> To: Jerry McAllister <jerrymc@clunix.cl.msu.edu> Cc: questions@freebsd.org Subject: Re: Hosed my MBR? Message-ID: <20060414161327.GD32858@polands.org> In-Reply-To: <200604141551.k3EFpwNJ002744@clunix.cl.msu.edu> References: <20060414154304.GC32858@polands.org> <200604141551.k3EFpwNJ002744@clunix.cl.msu.edu>
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On Fri, Apr 14, 2006 at 11:51:58AM -0400, Jerry McAllister wrote: > > > > > > In your case, it sounds like you have two raid devices, one on > > > each controller. You would have to have an MBR on each and it > > > sounds like you think you wiped the one on the INTEL controller. > > > Figure out what device name the raid on the INTEL controller comes > > > up as and then write the MBR to that. > > > > > Thanks for your response. My follow-up question to you is how would > > running a FBSD fdisk command on the Intel controller fix a hosed > > WinXP MBR? Or is an MBR OS agnostic? > > Well, the FreeBSD MBR is. I have used a FreeBSD MBR to fix a hosed > MBR (hosed by Ghost) on an XP only (eg. no FreeBSD on it) machine and > it worked fine. > really? I suspect it was sysinstall's fdisk that hosed my MBR on the Intel controller in the first place. Cause now it brings up a broken FreeBSD boot loader instead of the WinXP loader. > I suspect it might not work in the reverse direction, though. The MS > MBR is not known for playing nice with other OS boot sectors. I don't > know what the difference it. > hmmm... > Is there some other disk and [preferrably SCSI] controller you can > stick in and install FreeBSD on and try to mount and check out the > raid that you think is hosed before doing anything irreversable? I > forgot if you said you had tried looking at it with a fixit disk but > that might work if the raid is hardware raid. > I can still boot FreeBSD off my FastTrack controller (ar0), that's where I'm writing this email from. I can see both the Intel RAID device (ar1), and mount the data from NTFS (ar1s1), and newly created UFS-2 (ar1s2). I even did a dd of the MBR from ar0 and ar1 and compared the two. Of course, I don't know what I'm looking at so that didn't go too far :) -- Regards, Doug
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