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

[Robert Trevellyan]

I'm sorry, when you said "all drives in questions are completely good", I
assumed you still had the source drive. That way, you could use partclone
--domain to create a domain mapfile, and from there use ddrescue
--domain-mapfile to pull a specific partition out of the image.

Robert Trevellyan


On Mon, Jan 21, 2019 at 5:09 PM Shahrukh Merchant <
address@hidden> wrote:

> 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.)
>
> Shahrukh
>
>  -------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
>  option.
>
>  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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