Mailinglist Archive: opensuse (795 mails)

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Re: [opensuse] another WD Green AV-GP HD failure
  • From: Greg Freemyer <greg.freemyer@xxxxxxxxx>
  • Date: Wed, 1 Nov 2017 12:32:38 -0400
  • Message-id: <CAGpXXZJS=QUb5EWbz7q2HjVqUoswm==08SdBb6=fajnsEp+k8A@mail.gmail.com>

The DVDR froze trying to play a recording, so I shut it down, pulled the HD
out,
and made an image of it thus:

ddrescue -d /dev/sdc dvdrfile.img dvdrfile.logfile

Rescued size while running was 10MB less than total size. Average rate was
49894kB/s. Errsize: 67072B. Errors: 81. Rescued: 320072MB. ipos/opos 314588MB.
Runtime: 106min.

With default options skip-size is not one sector. So each error saw
numerous sectors skipped.

Also the default is to image in the forward direction.

Now that you're 99.9% done, you want to override both:

-- reverse causes the sectors to be read from the highest sector
first. That mechanically changes how the heads move around, so it can
cause unreadable sectors to become readable.

-- skip-size=512,512 forces a error to only impact a single sector.

So you want to rerun the command as:

ddrescue -d /dev/sdc --reverse --skip-size=512,512
dvdrfile.img dvdrfile.logfile

Be absolutely sure the image file and the logfile are the same as from
your first run. If they are, ddrescue use the logfile to determine
what you've already successfully grabbed and ignore it. Thus on the
10 MB of non-recovered space will be attempted.

Anything newly recovered will be placed inside your image file.

Good Luck
Greg

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