Re: recovering back-up.

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Tim:
>> There is a "ddrescue" tool with that kind of thing in mind.


home user
> Having looked at the man page, I couldn't make sense of how I should use 
> these for this situation.

See if this page is any different from what you've read, then try
discussing things with people here:

https://www.gnu.org/software/ddrescue/manual/ddrescue_manual.html

I don't think I've ever used *it*, though.

I do remember using some recovery tools, long ago, for some drive that
Windows mangled.  The problem with data recovery is that often you can
only get partial remains from each file.  Which may be good enough for
recovering important bits of some text, but not for direct use of
existing files.

If you want to attempt to recover from a drive failure (of any kind),
it's important that all subsequent accesses are read-only.  Don't let
anything write anything to the drive, that includes new meta data about
when files were accessed.

There's different approaches to recovering data from a drive with drive
failures as opposed to the computer stuffing it up.

If the drive is failing, then repeatedly trying to read it until you
recover something is a common approach, bearing in mind that doing
*that* can cause worsening of the failure.

If you're recovering from a stuff-up, and you presume the drive is fine
but you just want to recover data from it.  In that case using dd to do
a direct dump of all the bits to another drive, then attacking that
copy with recovery tools *may* be the way to go (though doing this with
a big drive is difficult).  The dump is going to make a clone, a copy
made now should be the same as one made ten minute later, so there's no
point in repeatedly trying to read a non-failed drive to get better
results, and you don't risk anything going wrong with the original
drive.

Seeing as you said just plugging it into a Windows box but not letting
Windows do it's "format the drive it doesn't recognise" routine was
enough to kill it does kind of suggest the drive may be faulty.

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