I had previously installed Windows 8 RC successfully into a VHD so I knew what I was up against.
Hence the decision to install into a VHD, which is a very neat solution that lets me keep Windows 10 TP separate from my real hard disk partitions and still enjoy the full native speeds of my real hardware. At the same time, I also did not want to dedicate a real hard disk partition for the sole purpose of installing Windows 10 TP. While I had successfully managed to install it on a virtual machine in Oracle VirtualBox, I was dissatisfied with the sluggish performance of a VM. I had been trying to install Windows 10 Pro Technical Preview onto a VHD, as I have Windows 7 Ultimate and can run an operating system from VHD (this feature is apparently limited to Enterprise and Ultimate editions).
