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How To Check If Windows 10 Has Enabled Compact OS Feature?

Windows 10 achieves smaller system footprint as compare with previous Windows OS by compressing the system files. This feature is better known as Compact OS.

Because of the system files are not compressed in single WIM file, Compact OS allows Windows Update to replace or delete each of the affected system files individually, which will help in minimizing system footprint over time.
Besides, Windows 10 does not require recovery partition for Refresh and Reset functionalities that return Windows to pristine state (like a clean installation), as it can reconstruct system from Windows Component Store (i.e. WinSxS folder).

To run the follow commands, you need to open an elevated Command Prompt window (i.e. running cmd.exe with true administrator privilege):

Validate Compact OS status
To find out if your Windows 10 is using Compact OS:
compact.exe /CompactOS:query

If it shows that the system is in compact state, it means the feature has turned on.

Enable or disable Compact OS
If it’s not enabled during Windows 10 installation, you can turn on Compact OS after installation with this command to compress all system binary files:
compact.exe /CompactOS:always

Likewise, you can also turn it off if system performance degrades after compacting OS binaries:
compact.exe /CompactOS:never
With reference to how Windows 10 achieves its compact footprint, Windows 10 installer will not turn on the feature if assessment suggests that system hardware is not suitable for Compact OS (it affects performance).

See also Compact OS and Single-instancing.

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