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

[andrew zajac]

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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