Signed into Windows Insider using the fast ring and downloaded and installed Preview Build v18312.
This was not installed on my main machine but was installed on my "do what I want to with" machine.
The only real problem I had with the install, it did not install
drivers for the Universal Host Controllers, so no USB ports.
The work around was to use a PS2 keyboard and mouse, that I happened to have, to access Device Manager
and to uninstall the updated UHC driver, I had installed, and then manually install the Windows UHC drivers.
This would not have happened if I had did a clean install. Everything is working well now.
This is the "This PC" property screenshot.
This is the "Disk Management" screenshot.
If I had did a clean install Windows would
have put a boot partition in front of C Drive,
I do not like that and will not allow that on my PC.
Since I will not be doing a System image of this Preview,
then I will keep the Recovery Partition. Whether one likes
W10 or not, I am afraid it is here to stay. Waiting for the next
W10 Preview?
