Re: Progress report Re: Invoking ddrescue

From	Richard Owlett <rowlett@cloud85.net>
Newsgroups	linux.debian.user
Subject	Re: Progress report Re: Invoking ddrescue
Date	2016-11-14 22:00 +0100
Message-ID	<sDwwa-3wG-11@gated-at.bofh.it> (permalink)
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On 11/14/2016 2:16 PM, Jonathan Dowland wrote:
> On Mon, Nov 14, 2016 at 01:09:51PM -0600, Richard Owlett wrote:
>> There is light at the end of the tunnel which doesn't appear to be an
>> oncoming train ;/
>>
>> This is a manually created transcript of what I've done this morning.
>> I physically can *NOT* do a copy-n-paste of what's happening as it is
>> currently in progress on a separate _intentionally isolated_ laptop.
>
> Broadly the transcript looks fine to me.
>
>> The rescue appears to be progressing. ddrescue has been running for 1/2 and
>> reports rescuing ~47GB without any _reported_ errors. That's unexpected as
>> the partition was the Windows C: drive and WinXP refused to boot.
>
> It's possible that WinXP has corrupted files, or a corrupted filesystem, on top
> of a perfectly fine drive. This can happen for any number of reasons, including
> unexpected power cuts whilst Win XP was applying an update of some sort and in
> the middle of writing a critical file.
>
> Whilst ddrescue is running, you could, if you wish, check the drive's S.M.A.R.T.
> (Self-Monitoring, Analysis and Reporting Technology) logs, if you have smartctl
> (from the smartmontools package) installed. The command (as root/superuser) is
>
> 	smartctl -a /dev/sdc
>
> This *should* not have any impact whatsoever on the running ddrescue. The output
> is quite long so you may wish to pipe the above command to a pager (such as less)
> by appending "| less", and/or capture the output to another file (achieved at the
> same time by piping to 'tee' first, e.g. | tee -a some-output-file | less)
>
> The output might include lines such as the following  (all taken from running the
> command on one of my HDDs):
>
> ...
>> === START OF READ SMART DATA SECTION ===
>> SMART overall-health self-assessment test result: PASSED
> ...
>> SMART Error Log Version: 1
>> No Errors Logged
> ...
>
> The output (in particular the "Vendor Specific SMART Attributes with Thresholds")
> can be hard to interpret, which is why I suggested also saving to a file, but
> would tell you if the drive itself thinks it has suffered a failure.
>
> However if you are very risk-averse you are probably best leaving the machine
> entirely until ddrescue is complete.
>
> (definitely for another time: you can also instruct drives which support S.M.A.R.T.
> to perform one of a number of self-tests for problems using smartctl)
>
>> At the current rate I've another 2 hrs minimum. I'm not concerned about the
>> speed as both hard drive are on USB2 ports.
>
> It can take a very long time, especially once it gets to the later stages
> (scraping, trims, retries, etc.)
>
> I've been reading a single damaged DVD-r (capacity ~4GiB) for over a week and
> I'm not finished (I have interrupted the process however, as I am about to a
> different optical drive, which can be helpful when recovering from optical media
> but this is not relevant to HDDs or your situation)
>

I think I may go with the idea of corrupted file contents which 
create meaningless content that can be reliably read. I still 
have no _reported_ errors although the "current rate:" 
occasionally drops to ~3% of "average rate:". I don't know how 
hard WinXP tries to read marginal sectors.

In this case, I am significantly "very risk-averse" ;/ It is 
running. I will leave well enough alone.

Thread

Re: dd - proper use or more suitable program Andy Smith <andy@strugglers.net> - 2016-11-11 18:00 +0100
  Re: dd - proper use or more suitable program Christian Seiler <christian@iwakd.de> - 2016-11-11 18:40 +0100
    Re: dd - proper use or more suitable program The Wanderer <wanderer@fastmail.fm> - 2016-11-11 19:20 +0100
      Re: dd - proper use or more suitable program Richard Owlett <rowlett@cloud85.net> - 2016-11-11 22:40 +0100
        Re: dd - proper use or more suitable program Andy Smith <andy@strugglers.net> - 2016-11-12 05:50 +0100
          Re: dd - proper use or more suitable program Richard Owlett <rowlett@cloud85.net> - 2016-11-12 09:20 +0100
  Re: dd - proper use or more suitable program Nicolas George <george@nsup.org> - 2016-11-11 19:00 +0100
    Re: dd - proper use or more suitable program Richard Owlett <rowlett@cloud85.net> - 2016-11-11 22:40 +0100
      Re: dd - proper use or more suitable program Christian Seiler <christian@iwakd.de> - 2016-11-12 08:40 +0100
        Re: dd - proper use or more suitable program Richard Owlett <rowlett@cloud85.net> - 2016-11-12 09:30 +0100
          Re: dd - proper use or more suitable program Richard Owlett <rowlett@cloud85.net> - 2016-11-12 18:30 +0100
            Re: dd - proper use or more suitable program Pascal Hambourg <pascal@plouf.fr.eu.org> - 2016-11-12 19:30 +0100
              Re: dd - proper use or more suitable program Richard Owlett <rowlett@cloud85.net> - 2016-11-12 20:30 +0100
                Re: dd - proper use or more suitable program Ben Caradoc-Davies <ben@transient.nz> - 2016-11-12 21:00 +0100
                Re: dd - proper use or more suitable program Brian <ad44@cityscape.co.uk> - 2016-11-12 21:10 +0100
                Re: dd - proper use or more suitable program <tomas@tuxteam.de> - 2016-11-12 22:00 +0100
                Invoking ddrescue Richard Owlett <rowlett@cloud85.net> - 2016-11-13 04:10 +0100
                Re: Invoking ddrescue "Thomas Schmitt" <scdbackup@gmx.net> - 2016-11-13 13:00 +0100
                Re: Invoking ddrescue <tomas@tuxteam.de> - 2016-11-13 13:10 +0100
                Re: Invoking ddrescue <tomas@tuxteam.de> - 2016-11-13 13:00 +0100
                Re: Invoking ddrescue "Thomas Schmitt" <scdbackup@gmx.net> - 2016-11-13 13:40 +0100
                Re: Invoking ddrescue Pascal Hambourg <pascal@plouf.fr.eu.org> - 2016-11-13 13:50 +0100
                Re: Invoking ddrescue Nicolas George <george@nsup.org> - 2016-11-13 14:00 +0100
                Re: Invoking ddrescue "Thomas Schmitt" <scdbackup@gmx.net> - 2016-11-13 14:40 +0100
                Re: Invoking ddrescue Pascal Hambourg <pascal@plouf.fr.eu.org> - 2016-11-13 15:10 +0100
                Re: Invoking ddrescue "Thomas Schmitt" <scdbackup@gmx.net> - 2016-11-13 16:10 +0100
                Re: Invoking ddrescue Richard Owlett <rowlett@cloud85.net> - 2016-11-13 17:30 +0100
                Re: Invoking ddrescue Brian <ad44@cityscape.co.uk> - 2016-11-13 15:20 +0100
                Progress report Re: Invoking ddrescue Richard Owlett <rowlett@cloud85.net> - 2016-11-14 20:20 +0100
                Re: Progress report Re: Invoking ddrescue Jonathan Dowland <jmtd@debian.org> - 2016-11-14 21:20 +0100
                Re: Progress report Re: Invoking ddrescue Richard Owlett <rowlett@cloud85.net> - 2016-11-14 22:00 +0100
                Re: Progress report Re: Invoking ddrescue <tomas@tuxteam.de> - 2016-11-14 21:30 +0100
                Re: Progress report Re: Invoking ddrescue Richard Owlett <rowlett@cloud85.net> - 2016-11-14 22:20 +0100
                Re: Progress report Re: Invoking ddrescue "Thomas Schmitt" <scdbackup@gmx.net> - 2016-11-14 21:30 +0100
                Re: Progress report Re: Invoking ddrescue Richard Owlett <rowlett@cloud85.net> - 2016-11-14 22:10 +0100
                Re: Progress report Re: Invoking ddrescue Pascal Hambourg <pascal@plouf.fr.eu.org> - 2016-11-17 20:20 +0100
                SUCESS!!! - was [Re: Progress report Re: Invoking ddrescue] Richard Owlett <rowlett@cloud85.net> - 2016-11-14 23:40 +0100
                Re: SUCESS!!! - was [Re: Progress report Re: Invoking ddrescue] Brian <ad44@cityscape.co.uk> - 2016-11-15 00:30 +0100
                Re: SUCESS!!! - was [Re: Progress report Re: Invoking ddrescue] Richard Owlett <rowlett@cloud85.net> - 2016-11-15 04:00 +0100
                Re: SUCESS!!! - was [Re: Progress report Re: Invoking ddrescue] Brian <ad44@cityscape.co.uk> - 2016-11-15 21:00 +0100
                Re: SUCESS!!! - was [Re: Progress report Re: Invoking ddrescue] <tomas@tuxteam.de> - 2016-11-15 22:00 +0100
                Re: SUCESS!!! - was [Re: Progress report Re: Invoking ddrescue] "Thomas Schmitt" <scdbackup@gmx.net> - 2016-11-15 12:50 +0100
                Re: SUCESS!!! - was [Re: Progress report Re: Invoking ddrescue] Brian <ad44@cityscape.co.uk> - 2016-11-15 13:30 +0100
                Re: SUCESS!!! - was [Re: Progress report Re: Invoking ddrescue] "Thomas Schmitt" <scdbackup@gmx.net> - 2016-11-15 13:50 +0100
                Re: SUCESS!!! - was [Re: Progress report Re: Invoking ddrescue] Richard Owlett <rowlett@cloud85.net> - 2016-11-15 13:50 +0100
                Re: SUC[C]ESS!!! - was [Re: Progress report Re: Invoking ddrescue] David Wright <deblis@lionunicorn.co.uk> - 2016-11-15 16:30 +0100
                Re: SUCESS!!! - was [Re: Progress report Re: Invoking ddrescue] "Thomas Schmitt" <scdbackup@gmx.net> - 2016-11-15 17:20 +0100
                Re: SUCESS!!! - was [Re: Progress report Re: Invoking ddrescue] Greg Wooledge <wooledg@eeg.ccf.org> - 2016-11-15 17:30 +0100

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