Hi tim,
thank you very much. this was a very informative posting!
Brian
----- Original Message -----
From: "Tim Chase" <blinux.list@xxxxxxxxxxxxx>
To: "Linux for blind general discussion" <blinux-list@xxxxxxxxxx>
Sent: Tuesday, April 28, 2009 6:40 PM
Subject: Re: data recovery from a fedora 5 system
for several years i've been running a fedora core 5 system that seriously
crashed the other day.
it was caused by a faulty power supply.
This part is fixed now, but now I don't know to recover data from the
harddrive.
If the power-supply was the only thing that died, replacing it should be
sufficient and the rest of the system should just come back up. You might
have to run a fsck on the drive when it boots, but it should be fine.
I've had this happen to me uneventfully.
If for some reason the hard-drive crashed, you have deeper problems. The
first thing to do would be to put it in another machine and image it using
the "dd" command. Assuming this defunct hard-drive is /dev/sdb you can
use
dd if=/dev/sdb of=image.dsk
Alternatively, you can copy the drive image remotely from another machine
by booting a CD/flash drive on your old machine and then from your
new/good machine use:
scp brian@oldmachine:/dev/sdb image.dsk
If you *can* image the disk, you've got a chance of rescuing your files.
However, if you can't even get a disk image, you may be out of luck and
have to use a recent backup or send the drive to a drive-salvage company
to get them to extract the content for a large price-tag.
With that drive image, you can then try to mount that file on a loopback
device as read-only to salvage your files. If that fails, you might try
to use tools like "ddrescue" or "foremost". Kyle Rankin authored a good
Linux Journal article on using ddrescue.
http://www.linuxjournal.com/article/10360
If that doesn't work you can try
foremost -t all -i image.dsk
to pull all the files that foremost knows how to find (it only recognizes
certain file-types). Both are available in my standard Debian & Ubuntu
repositories.
Hope this helps,
-tim
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