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Re: [Bug-ddrescue] How to restore just a single partition of a multi-par

From: Robert Trevellyan
Subject: Re: [Bug-ddrescue] How to restore just a single partition of a multi-partition image file?
Date: Mon, 21 Jan 2019 12:57:02 -0500

A more suitable tool for the job might be something like partclone, or
clonezilla (which is built on top of partclone). Also, take a look at
combining partclone's --domain option with ddrescue's --domain-mapfile

Robert Trevellyan

On Mon, Jan 21, 2019 at 12:33 PM Shahrukh Merchant <
address@hidden> wrote:

> I have a ddrescue-generated "fulldrive.img" file of a complete 1 TB
> drive comprising 4 partitions - C: (200 GB Win7 OS) G:(800 GB Data) (and
> 2 other recovery/OEM partitions that are not important for this
> discussion).
> I have a current system with a new 2 TB drive installed with the same 4
> partitions, except that C: and G: are slightly larger (250 GB and 1000
> GB respectively) and there is some unallocated space.
> The C: partition is the OS System partition and is corrupt (though
> bootable, if barely--various system files are missing). I would like to
> restore just that C: partition from the fulldrive.img backup without
> touching the G: partition on the new 2TB drive.
> I cannot see a straightforward way to do this in ddrescue--can someone
> help? Even if I manage to mount just the C: partition within the
> fulldrive.img file somehow (using mount with an offset, I believe,
> though I have never done this), and then use ddrescue to "clone" that
> mounted partition to the desired C: partition on the 2 TB drive, I'm
> skeptical (or at least wary) that that will result in a bootable system
> partition on the new drive.
> I know I can also do it with a 3-stage process:
>         ddrescue from fulldrive.img to a "spare" 1 TB drive
>         ddrescue just from the resulting C: partition to cpartition.img
>         ddrescue from cpartition.img to just the C: partition of the 2 TB
> drive
> but that seems rather a brute force and time consuming approach and it
> seems that there must be a simpler way!
> As a clarification, all drives in questions are completely good (at a
> hardware and partition level), as is the ddrescue fulldrive.img file. I
> am using ddrescue strictly as a cloning/backup/restore resource in this
> case, not for recovery from a failing drive.
> Any solution that I'm not seeing? A Google search didn't turn up
> anything clear either.
> Thanks,
> Shahrukh
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