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Re: Help with ddrescue

On Fri, 8 May 2015 17:22:11 -0600
Bob Proulx <bob@proulx.com> wrote:

> German wrote:
> > Bob Proulx wrote:
> > > I think I read that you have one identically sized drive, yes?  I
> > > am not sure where you are sitting with regards to the other
> > > suggestions. But at the least I would make one good backup as
> > > soon as possible. And it seems that possibly you have the
> > > capability at this time?
> > 
> > Yes, I do have two identical 2TB drives. So, you are advising to
> > make a back up. Something like ddrescue if=/dev/sdX of=/dev/sdY ?
> Again I am not sure of the status of things with you since there have
> been many good suggestions in this discussion thread.  You may be
> halfway down a different path.  But yes if I were having hardware
> problems I would make a backup as soon as possible.  (Actually I
> already have backups all of the time.  Backups are important.)
> Always use a log file with ddrescue.  If I have both of those disks
> mounted on a second system with its own disks then put the logfile on
> the host system.  That would be on the host system and not either the
> source or target.
>   ddrescue if=/dev/sdX of=/dev/sdY /var/tmp/rescuelogfile

Hmm.. The Wanderer suggest that *if= and of=* is the wrong syntax.
He says that this should be simple as this:

ddrescue /dev/sdX /dev/sdY /path/to/logfile

Who is right?
> If you had booted a livecd and wanted that logfile to be persistent
> then mount up a USB storage device and store it there.
>   ddrescue if=/dev/sdX of=/dev/sdY /media/usb1
> Where /media/usb1 is an example of a mounted usb storage device.
> Replace that string with the mount point of the usb device mounted on
> your host system.
> I now read that perhaps it wasn't hardware problems.  If the disk is
> okay then the first thing I would do is to fsck it.  But if the disk
> is having hardware problems then I would copy a backup first.
> Bob

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