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

From: Shahrukh Merchant
Subject: Re: [Bug-ddrescue] How to restore just a single partition of a multi-partition image file?
Date: Mon, 21 Jan 2019 19:09:37 -0300

Thanks for the suggestion, Robert, I'll check out Clonezilla as a possible 
future tool (although based on a quick look, given that its file format is 
not easily mountable, e.g., with OSFMount, which is what I really like, 
among other things, about using ddrescue as a drive imaging tool even when 
no rescue is necessary), I'm guessing I'll probably stick to ddrescue.

At any rate, for my present problem, the archive in question is a ddrescue-
created full disk image, so my original question remains: Is there a way to 
use ddrescue (and if not, a definitive answer in the negative would be 
useful too, so I can stop looking!) to restore just one of the partitions 
contained within?

(The suggestion to use ddrescue's --domain-mapfile option seemed like it 
could do the trick, except that as far as I call tell, partclone's -domain 
option works on the live partition, and I have only the ddrescue-created 
imagefile of the entire drive with the partition embedded.)


 -------Original Message-------
 From: Robert Trevellyan <address@hidden>
 To: dd-rescue <address@hidden>
 Subject: Re: [Bug-ddrescue] How to restore just a single partition of a 
multi-partition image file?
 Sent: 21 Jan '19 14:57
 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 
 > 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
 > _______________________________________________
 > Bug-ddrescue mailing list
 > address@hidden
 > https://lists.gnu.org/mailman/listinfo/bug-ddrescue
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