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It seems that using diskpart merge to merge a differencing drive and parent does not provide an option to target a new VHD file. Fine, I've backed up my parent vhd files, and the child.

When I execute the merge will the parents remain unmodified, or will they have the content of the child merged in them.

I need the child VHD to be standalone, but the other child vhd to continue to work off the parent.

What bit of documentation I have been able to find, is not clear as which direction the data flows.

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The data flows back into the parent. You won't get what you want directly from diskpart.

What you want is to mount the differencing chain and duplicate the contents into a new VHD. That can be done most easily by creating a new VHD and copying the contents of the old child, mounted.

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