Re: [Bug-ddrescue] fill-mode vs luks encryption

[Atom Smasher]

On Fri, 6 Jun 2014, Scott Dwyer wrote:

> I am assuming that you are used to using the find/grep method. Check out 
> this link for more ideas that may work in your case, assuming the file 
> system is mountable: 
> http://tim.purewhite.id.au/2011/04/disk-recovery-which-files-are-damaged/
=============

no, apparently this file-system needs to be fsck'd before it can be 
mounted.


> The one that is likely to work the best in your case would be the one 
> using MD5 checksums. The idea is to make a list of all the files MD5 
> checksums, then use the fill mode to change the bad sectors, then make 
> another list of the checksums and compare the lists. Because the disk is 
> encrypted you won't be able to find a specific pattern like you say, but 
> this method looks for differences in the files themselves which won't 
> care what the pattern is.
============

that should work!

i can make a copy of the recovered image, and use fill-mode on one of the 
copies. then fsck them both, mount them both (as read-only loop devices) 
and just "diff -r" the two mounted file systems.

if i didn't have the drive space to create two images at the same time, i 
could do similar with find/sha1sum, then fill-mode, then "sha1sum -c".

thanks!


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