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 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
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 <http://gnu.org/licenses/gpl.html> 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: http://fm.no-ip.com/Tmp/Hardware/Disk/dvdrfile.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)
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