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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