I am using docker toolbox on Windows 7 to run docker. (docker version 1.9.1)
As it turns out, the docker machine creates its VM at C:\\Users\\username\\.docker\\mach
I use windows 10 and Docker desktop (community) Version 2.0.0.0, I want to move vhdx file to another Drive.
Right click over Docker Desktop -> Settings then the Docker Desktop UI will open go to Advance -> Disk image location just change the path to new destination, the whole process was smooth and fast for me - it's automatically copy the vhdx file from original path to new path restart docker and all work as expected