Date: Sat, 24 Feb 2007 18:12:39 +1100 (EST) From: Ian Smith <smithi@nimnet.asn.au> To: Jerry McAllister <jerrymc@msu.edu> Cc: Marty Landman <martster@gmail.com>, freebsd-questions@freebsd.org Subject: Re: input/output error on hd Message-ID: <Pine.BSF.3.96.1070224175831.2636C-100000@gaia.nimnet.asn.au> In-Reply-To: <20070223181710.GA28856@gizmo.acns.msu.edu>
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On Fri, 23 Feb 2007, Jerry McAllister wrote: Jerry, just on a couple of points: Me to Marty: > > Does the above result mean that my boot sector is ok? > > I think maybe you might be getting some of your terminology shuffled > around. Your boot sector is not at question here. It doesn't > affect the ability to read the disk partition. I was talking about sector 0 on ad1. If the disk were bootable it would be the 'boot sector', but it's not bootable. It still contains the DOS partition table though. boot0cfg -v <drive> shows this info too. > Secondly, it looks like the slice table - which is what fdisk mucks > with - is OK. Luckily .. though with only one slice on the disk, easily recreatable. > What seems to be messed up is either the slice 1 label which contains > the partition table. In fact, with one of your postings, it looked > like it thinks it is slice 4, but I don't remember what you did to > get that. Try 'fdisk ad0sY' where Y is any freebsd slice, and you'll get that (or at least, I do on both my ad0 freebsd slices). Maybe fdisk should barf or at least whinge rather than reporting the first sector of any slice specified as if it were a sector 0 / MBR / boot sector? > If none of this helps at all, then the problem is past the label and > in to the filesystem structure itself. Then I think you are stuck with > tracing superblocks as I pointed out before. That is going to take some > study but it might work. Yep, it depends on how precious this data is, but no learning is wasted. Cheers, Ian
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