| Item | Size | | :--- | :--- | | | ~100 MB | | Full cumulative update (via WU) | 1.5 – 1.8 GB | | Official ISO download | 4.8 – 5.4 GB | | Final installed OS (clean) | 25 – 30 GB | | Recommended free space for upgrade | 64 – 80 GB |

Although the OS itself takes up less space, you need a healthy buffer to install it successfully.

October 26, 2023 Subject: Analysis of Installation Footprint and System Requirements for Windows 11 24H2

The OS itself isn't huge, but the process of upgrading requires a significant amount of temporary free space.

The "size" of Windows 24H2 can be measured in two ways: the size of the installation files (ISO/UUP) and the occupied disk space post-installation.

Starting with 24H2, Microsoft introduced a feature called . Instead of downloading 1.5 GB of patches every month, Windows will download only the "reverse differential" (the changes since the last checkpoint).

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