Tool for recovering data from crashed HD

[d l]

If the disc has really failed(partially), it might be
better to use a devel-board/devel-box instead of your
production machine when trying to retrive the data back.

Many devel boards have IDE port built in, you can look at
the disc data sector by sector with it. And when the disc
fails, you just have to restart the devel board (take
~10-30 secs). much better then having to wait for linux to
reboot over and over.

--- jludwig <wralphie at comcast.net> からのメッセージ：
> On Thu, 2004-05-06 at 10:08, Jay Daniels wrote:
> > On Thu, May 06, 2004 at 06:19:42PM +0800, Ow Mun
> Heng wrote:
> > > I've got a HD which seems to have problems. 
> > > ( I can't boot from it)
> > > 
> > > I would like to know what tools are available to
> actually
> > > perform some kind of data recovery or something.
> > > 
> > > Currently, I'm just booting into a copy of
> Knoppix and then mounting
> > > the HD and copying (what can be copied) off the
> drive to another network 
> > > location.
> > > 
> > > Sometimes it works. sometimes it just hangs at
> scp.
> > > 
> > > Pointers??
> > 
> > I think you can create an iso or hard drive image
> to save the data if
> > you can read the hd then mount the iso.
> > 
> > dd if=/dev/hd3 of=hd.iso  #if hd3 is the hd drive
> > mkdir /mnt/iso
> > mount -o loop -t iso9660 hd.iso /mnt/iso
> > cd /mnt/iso && ls -la
> > 
> > Of course that doesn't answer why you can't boot,
> but if the hd is
> > failing, you may be able to save the data.  Did
> you mean you can't
> > boot from it or you can't mount or access it? 
> What boot errors do you
> > get?
> > 
> > 
> > jay
> If the drive is failing any sector R/W error will
> kill the process.
> I addressed this issue yesterday. Here is a copy of
> that information,
> and you can skip the points that don't apply to you.
> 
> 1) LBAsect would be more properly rendered LBA 
> sect. 
> 
> 2) It is actually the drive that freezes the machine
> not the file.
> 
> 3) The drive may be experiencing a head/electronics
> failure which may be
> totally random in nature.
> 
> 4) I have found that failing drives usually 'do
> better' when cold (just
> turned on).
> 
> 5) If it is damaged media usually the hard drive DSP
> and firmware will
> isolate the bad areas and move the data to "spare
> sectors".
> 
> 6) With all this in mind, I suggest you remove data
> starting with the
> most important/critical. Ignore replaceable stuff
> Gnome, Xfree, other
> such software. Remember special configuration files.
> 
> The way I have usually done this is to remove the
> drive and install a
> new drive. Reload all available software and make
> directories for the
> old drive to mount on (S.A. /boot1, /home1, /usr1,
> etc.) and offload
> everything I can (This may take several reboots with
> cool down time).
> 
> 
> 
> -- 
> jludwig <wralphie at comcast.net>
> 
> 
> -- 
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