I'm interested in the installation size of Windows 10 when it has been installed on an existing, clean, Windows 7 or Windows 8 installation. By "clean" I mean only a standard non-OEM OS and critical drivers, and updates.
- A computer is installed with a typical Windows 7 Ultimate x64 OS
- Critical updates are applied to the point that the Windows 10 Upgrade tool is installed
- Disk cleanup is executed to recover as much space as possible
- The upgrade tool is used to perform the OS upgrade
- After the upgrade is complete Disk Cleanup is again performed to recover space
How many GB would this occupy? Would there be a significant difference if upgrading from Windows 7 vs. Windows 8?