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

From: Atom Smasher
Subject: Re: [Bug-ddrescue] fill-mode vs luks encryption
Date: Mon, 30 Jun 2014 01:34:46 +1200 (NZST)

On Fri, 6 Jun 2014, Scott Dwyer wrote:

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.

before i sent the drive back to the manufacturer, i had >99.95% of the drive recovered. over 99.72% of the recovered data was in four large blocks.

keeping the original 1.4TB img file intact, i made two copies to a 4TB drive, checked the image hashes, then worked from the 4TB drive.

one of the images i assigned to a loop device, opened with "cryptsetup luksOpen", fsck'd with no errors and mounted, read-only.

the other image was "filled" ("--fill=-/"), then attached to a loop device, then opened with "cryptsetup luksOpen", then fsck'd with no errors and mounted, read-only.

i ran "diff -r" on the two mount-points, and it found no differences.

100% data recovery!! no lost data!!

thanks y'all!!


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        "No two men are alike, and both of them are happy for it."
                -- Morris Mandel

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