Date: Thu, 11 Mar 2004 15:21:28 +0100 From: Daniel Lang <langd-freebsd-hackers@leo.org> To: "C. Kukulies" <kuku@www.kukulies.org> Cc: hackers@freebsd.org Subject: Re: off topic - disk crash Message-ID: <20040311142128.GG20701@atrbg11.informatik.tu-muenchen.de> In-Reply-To: <200403101736.i2AHaqIF029948@www.kukulies.org> References: <200403101736.i2AHaqIF029948@www.kukulies.org>
next in thread | previous in thread | raw e-mail | index | archive | help
--cf0hFtnykp6aONGL
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable
Hi,
C. Kukulies wrote on Wed, Mar 10, 2004 at 06:36:52PM +0100:
[..]
> The disk boots into FreeBSD but already at power on time the disk does
> seek retries or some recalibration noise.
>=20
> The question is what else can I do to recover the data.
> Put it in the icebox? Turn the computer upside down?
[..]
Put it into another box running a working FreeBSD
and enough disk-space to contain all the contents of
the damaged disk.
Check if you can still read the disklabel
(just do "disklabel ad1s1 (or whatever your device is)).
If you can read the disklabel, grab the contents of
each partition with dd, use the 'conv=3Dnoerror,sync'
options to fill unreadable sectors with zeros.
Turn the resulting partition-image files into devices using
vnconfig.
Now you can either:
a) fsck the devices and then mount them to grab what is left
of the data. This is the more reliable way, but fsck may
render some data inaccessible.
If the superblock is damaged, read fsck and newfs manpages,
as well as the handbook, how to get a backup-copy
of your superblock.
b) mount the device read-only and grab what is left of the data.
If the filesystem is badly damaged, this could panic your
machine. So don't do it unless you really have to.
You can make a copy of the partition image-files, and do the
fsck on one copy. You still have the other one if you want
to try without fsck.
If you cannot read the disklabel, you can still use dd to=20
make an image of the whole disk. But you will have to find
the partition-boundaries for yourself. There is a tool in the
ports to find filesystem boundaries, IIRC. I don't recall the
name of this tool, though.
HTH,
Daniel
--=20
IRCnet: Mr-Spock - Cool people don't move, they just hang around. - =20
Daniel Lang * dl@leo.org * ++49 89 289 18532 * http://www.leo.org/~dl/
--cf0hFtnykp6aONGL
Content-Type: application/x-pkcs7-signature
Content-Disposition: attachment; filename="smime.p7s"
Content-Transfer-Encoding: base64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--cf0hFtnykp6aONGL--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20040311142128.GG20701>