You can cleanly install Windows 10 x64 on a new disk 2 ways: 1. Simply select the disk (Unallocated space) without pressing Format and Windows 10 x64 will install on that disk, creating only 1 (I think) extra hidden recovery or MBR or whatever partition. 2. Select the disk, select Format, which creates 3 partition - a Recovery one (450Mb), the main one, the 100mb one, and the 16mb one - sorry do not remember the exact names. What is the difference? What is the correct way - to format and have these 3 extra partitions or not format and have only 1 extra partition. What exactly do they do? I would love to have a partition or a system that keeps every single vital file and registry entry that no matter how badly you mess up your OS, no matter what you delete/disable/change, the Recovery partition would always let the OS boot. Too bad it does not seem to be the case... I only use UEFI GPT for FastBoot.