Date: Fri, 14 Apr 2006 10:43:04 -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: <20060414154304.GC32858@polands.org> In-Reply-To: <200604111727.k3BHR3t7020048@clunix.cl.msu.edu> References: <64211.209.103.215.99.1144769105.squirrel@email.polands.org> <200604111727.k3BHR3t7020048@clunix.cl.msu.edu>
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On Tue, Apr 11, 2006 at 01:27:03PM -0400, Jerry McAllister wrote: > > > > On Tue, April 11, 2006 09:08, Jerry McAllister wrote: > > >> > > >> I'm in a bit of a mess here. I've got an Asus P4C800-E Deluxe > > >> motherboard with two on-board SATA RAID controllers, an Intel > > >> MatrixRAID (ICH5R) and Promise Fasttrak (PDC20378). My BIOS > > >> allows me to boot from either the Promise or the Intel > > >> controller. > > >> > > > > > > Well, the install CD is also the fixit CD. You can try booting > > > from it and choosing the shell and then trying to run the fdisk > > > from that environment to replace the MBR. > > > > > > I have done that for people who have hosed their MBR on machines > > > with Ghost - even their XP only, no FreeBSD, systems, using the > > > FreeBSD fixit, I ran fdisk and replaced the MBR with the FreeBSD > > > MBR and it worked just fine. > > > > > Hi Jerry, > > > > I think the root of my confusion here is the fact that I have two > > RAID controllers and can boot off either controller. > > > > Does that mean I have two MBR's, one for each controller? If that's > > the case and I boot off a CD-ROM, which MBR am I fixing? > > Are both controllers part of the same raid device? > no, as I said in my OP, each controller hosts a RAID1. The Intel has two disks for Win, and the FastTrak has two disks dedicated to FreeBSD. > Anyway, there needs to be an MBR on each bootable device as well as > the boot files. I think that holds true for raid setups as well. > > In addition, the first bootable device that your BIOS sees must have > an MBR regardless of whether you have 1 or more bootable devices. > > 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? -- Regards, Doug
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