input/output error on hd
jerrymc at msu.edu
Sun Feb 25 03:03:04 UTC 2007
On Sat, Feb 24, 2007 at 06:12:39PM +1100, Ian Smith wrote:
> 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.
OK. Yes, he already worked on the sector 0 earlier.
The DOS partition table is what is called the slice table in FreeBSD.
That seems to be OK - as I noted.
> > 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?
Probably should barf or make some other error message. Anyway, one
shouldn't run fdisk on a slice, but on the device, so that accounts for
the weird message I suppose.
> > 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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