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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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up vote 2 down vote accepted

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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