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| Subject: | Re: Problem using dd to clone a hard disk with bad sectors. |
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| Date: | Sun, 19 Feb 2006 20:33:57 +0100 |
Am Donnerstag, 16. Februar 2006 11:31 schrieb Willard Van Dyne:
Hi all. I'm trying to properly clone a 4.3GB (it's old, I know) hard disk which unfortunately has a lot of bad sectors. I am using Helix 1.7 as an operating environment, not mounting the old drive at all. I used the command: dd if=/dev/hdb of=/mnt/hda7/image.dd conv=noerror,sync My problem is that the md5 hash of the image file is different from that of the original HD (acquired via the command: dd if=/dev/hdb conv=noerror,sync | md5sum > /mnt/hda7/orig_disk_md5sum.txt) Can anyone please enlighten me as to what I'm doing wrong? Thanks in advance.
Do you know dd_rescue (debian pkg. ddrescue)? I never used it but it seems to be exactly suited for your kind of needs. The MD5 maybe changes since md5sum does expect an actually working drive/file. On read errors it may not be as well behaved as dd. Just guessing... -Christian
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