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Re: [Bug-ddrescue] Re: ddrescue crashes system on kernel 2.6.18


From: andrew zajac
Subject: Re: [Bug-ddrescue] Re: ddrescue crashes system on kernel 2.6.18
Date: Tue, 12 Jan 2010 16:49:49 -0800 (PST)

Hi Arik

You can use The Sleuth Kit to find what file corresponds to which block on the filesystem image.  Specifically, use ifind and istat.

Here is one example:
http://ubuntu-rescue-remix.org/node/180

But in that case, I only was missing one single block from the disk.  Maybe you can write a script to file through the entire 3.2 Mb of missing blocks.

What filesystem was on the drive?  Remember to use the correct units/block sizes when using The SleuthKit.  For example, you may specify an offset in bytes, but the block number is in 4096 bytes for NTFS...

Andrew



--- On Tue, 1/12/10, Arik Raffael Funke <address@hidden> wrote:

From: Arik Raffael Funke <address@hidden>
Subject: [Bug-ddrescue] Re: ddrescue crashes system on kernel 2.6.18
To: address@hidden
Received: Tuesday, January 12, 2010, 2:05 PM

Hi Andrew,

thanks for taking the time to help out!

I originally had the drive on a usb interface when I was still trying my
luck with dd for rescuing the data. After that was less a than rewarding
experience, I assumed: the least layers between program and drive, the
better. - Boy was I wrong...

After a first run with --no-split I am now only missing merely 3.2 Mb
from a 20Gb harddrive.

ddrescue is an amazing tool. I especially love the logging function.
Thanks for Antonio for his great work and to those supporting it here!

Can anybody point me to a tutorial on how to figure out which files were
affected by the ? Given the small error, I would like to avoid having to
be unnecessarily suspicious of every file. I can imagine in principle
how to find files that were entirely in the error region, but partially
affected files I am not sure about.

Many thanks,
Arik


On 10/01/2010 00:13, andrew zajac wrote:
>   Hi Arik.
>
> I don't know if the list of bad blocks is stored on the media itself or
> on memory on the drive's PCB. If the latter is the case, then you will
> run into recovery issues as the drive's OS assumes the bad blocks of the
> previous drive. Is that supposed to crash your system? I don't know.
>
> Can you try changing the interface? For example, are you able to use a
> USB interface instead of plugging in the drive directly to the
> motherboard? That would be less likely to bring down your system. Yes,
> it's much slower. But at least you can continue where you left off.
>
> Good Luck.
>
> Andrew Zajac
>
>
>
> --- On *Sat, 1/9/10, Arik Raffael Funke
> /<address@hidden>/* wrote:
>
>
>     From: Arik Raffael Funke <address@hidden>
>     Subject: [Bug-ddrescue] ddrescue crashes system on kernel 2.6.18
>     To: address@hidden
>     Received: Saturday, January 9, 2010, 3:29 PM
>
>     Hi,
>
>     Background: I have had a power supply unit failure and as a result
>     the PCBs of three hard drives were fried as well as the processor.
>
>     I have replaced the PCB from an identical drive for the data drive,
>     a WD200EB-00CSF0. The harddrive is seems to work fine for almost all
>     files: It can be mounted, data is generally accessible, etc.
>
>     When I try to image the drive with ddrescue, it proceeds without
>     errors within 20 minutes to 16.5Gb/20Gb where it encounters the
>     first errors. It then takes approximately another 5-10 minutes
>     apparently only getting errors before finally crashing the whole system.
>
>     A photograph of the screen can be seen here: (Sorry for the flash...)
>     http://img64.imageshack.us/img64/745/crasho.jpg
>
>     The result is the same with:
>     ddrescue -n
>     ddrescue --direct
>     ddrescue --raw
>
>     All attempts were made in runlevel 1 on a Centos 5.4 system with
>     kernel 2.8.18. Resuming recovery with the log file makes the system
>     crash shortly after resuming.
>
>
>     Can anybody tell me how to either:
>     - read out a complete image (obviously without the presumably bad
>     sectors) so that I can run file system recovery? The image now is
>     truncated.
>
>     - fix the hard drive problem? (I.e. why should the hard drive have
>     bad sectors in the last few GB given a mere power surge?)
>
>     Many thanks for any help!
>
>     - Arik
>
>
>     _______________________________________________
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>
>
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