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Re: [Bug-ddrescue] A way to check if ddrescue did a good job?


From: Antonio Diaz Diaz
Subject: Re: [Bug-ddrescue] A way to check if ddrescue did a good job?
Date: Thu, 21 Jun 2012 00:20:07 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i586; en-US; rv:1.7.11) Gecko/20050905

Hello Théo, sorry for the late answer.

Théo Koelz wrote:
Again not a bug, just a question (and maybe a suggestion). Ddrescue now
claims to have successfully rescued my hard drive, awesome, but a few
strange things happened and that makes me doubtful
[...]
I rebooted again and started to
rescue the bad sectors (ddrescue -d -f -r3 ...) and surprisingly things
went smoothly and it was done in like 2 days with only a small bad
sector of 452608B that couldn't be recovered

Perhaps the last time it went smoothly because you used direct mode (-d).


Maybe everything is well and I've been lucky, but as I said I'm a bit
doubtful and would like to know if there's a way to check if ddrescue
did a good job or not
[...]
(one way
to check this quickly could be to select a few random places on both
disks and compare them, but maybe some other software already does
that?).

Ddrescue can't currently make such checks directly, but I plan to implement some kind of verification pass. The idea of reading from random places seems a good one.


As usual thanks in advance, you've been very helpful.

You are welcome.

Antonio.



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