[ale] Extreme Practical Data Recovery (Part 2)

[Greg Freemyer]

Robert,

I have not used ddrescue much, but I have used dd for this
extensively.  With dd you get 2 slowdowns:

1) the kernel slows down the data transfers as it encounters issues.
Use hdparm to see the current speed.  I have never tried to
re-accelerate the interface after a slowdown, but in theory you can
use hdparm to do that.

2) While you are in the midst of bad sectors, the kernel is doing a
huge retry effort.  These are shown in /var/log/messages as bad
sectors.  That should go away as soon as you get past the bad patch.

Greg

On Tue, Jul 22, 2008 at 8:46 AM, Robert Coggins <ale at cogginsnet.com> wrote:
> So, this thread came at the perfect time. I am having to recover
> someone's laptop HDD here and it looks to be a mess.
>
> I have been taking suggestions from the previous thread for recovering
> data.  PhotoRec is awesome and gddrescue is looking good too.  However,
> I wanted to know your experiences with ddrescue.  I know it can take
> days sometime to copy a drive depending on how bad the condition of the
> drive it.  But I was wondering.  What is typical?  Should I plan on
> keeping this drive and  computer I am recovering with out for a week or
> so?  Once it is past the bad sectors does the speed pick back up?
>
> I am asking becuse this run at ddrescue has been running almost 24 hours
> now and I am at 3.5 gigs of 80.  I am hoping it will pick back up soon.
>
> Another question.  My HDD problems seem to be at the beginning of the
> drive.  Is there a way to run photorec or something from the end of the
> drive?
>
> Thanks for you input!
>
> Robert
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Greg Freemyer
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