Re: Clobbered MBR partition table
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On Tue, Apr 15, 2014 at 07:10:26AM -0400, George Mitchell wrote:
> My laptop has a hard disk I partitioned, whoops, I mean sliced, into
> four slices when I installed 8.2-STABLE on it a couple of years ago.
> The first, third, and fourth slices I reserved for future experiments,
> and most of the space went into the second slice where I installed
> 8.2-STABLE. Time went on and the second slice is currently running
> 9.2-STABLE, and I installed 10.0-PRERELEASE on the first slice late
> last year. But mostly I have been booting off the second slice, which
> means pressing enter at the initial F1/F2/F3/F4 boot prompt.
>=20
> Then last Friday I was preparing to update the first slice to the
> latest 10.0-STABLE. Things were going well until I rebooted and
> typed F1 at the boot prompt. I immediately got a second prompt
> offering me the options of second disk or PXE. At this point the
> machine was unbootable, as whatever I typed would cycle between the
> F1/F2/F3/F4 alternatives and the second disk/PXE alternatives. I hit
> ctrl-alt-delete and got told there was no bootable disk.
>=20
> So I got a new disk and plugged in into the laptop and started over
> again. (My first attempt was with a 10.0-RELEASE memstick image,
> but that's a subject for another day.) Out of conservatism, I have
> installed 8.4-STABLE on the new disk. Then the first thing I did
> was to hook up the old disk through a USB adapter and dump it with
> dd to a backup image. That's going to be finished in a couple of
> hours, at which point I hope to poke around on the old disk and
> repair what I assume is a clobbered master boot record partition
> table.
>=20
> My question is:
> What's the best tool to help reconstruct the partition table? I
> think my problem will be mostly solved if I can find the BSD labels
> on the old disk (which, by the way, has not exhibited any I/O errors
> during the "dd" backup process). Do BSD labels have a recognizable
> signature?
>=20
> Thanks for your help and attention. -- George
You can try sysutils/testdisk
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