Mailinglist Archive: opensuse (795 mails)

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Re: [opensuse] another WD Green AV-GP HD failure
Greg Freemyer composed on 2017-11-01 12:32 (UTC-0400):

The DVDR froze trying to play a recording, so I shut it down, pulled the HD
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
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

ddrescue: Numerical argument out of limits. :-(

# ddrescue -V
GNU ddrescue 1.20
Copyright (C) 2015 Antonio Diaz Diaz.
License GPLv2+: GNU GPL version 2 or later <>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

# zypper se -s -i rescue
i+ | gnu_ddrescue | package | 1.20-4.2 | x86_64 | OSS

# grep RETT /etc/os-release
PRETTY_NAME="openSUSE Leap 42.3"

In case it might be of use, the logfile:

Some of its entries look suspiciously large, one by two digits instead of one
like the rest.

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.
"Wisdom is supreme; therefore get wisdom. Whatever else you
get, get wisdom." Proverbs 4:7 (New Living Translation)

Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata ***

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