The Fake Shutdown
In order to make Windows 11 boot up faster on older hard drives, Microsoft utilizes a feature called “Fast Startup.” When you click the “Shut Down” button, Windows does not actually shut the computer off. Instead, it forcefully closes your applications, logs you out, and then hibernates the core operating system kernel to a massive file on your hard drive before cutting the power. While this shaves a few seconds off your boot time, it causes catastrophic issues if you are attempting to dual-boot Linux. The hibernation file locks the Windows partition, preventing Linux from reading your files. To achieve a clean, true shutdown, you must disable this hybrid hibernation feature.
How to Turn Off Fast Startup
You cannot disable Fast Startup from the modern Windows 11 Settings app; you must use the legacy Control Panel.
- Click the Start Menu, type Control Panel, and press Enter.
- In the top right corner of the Control Panel, ensure “View by:” is set to Large icons.
- Click on Power Options.
- On the left-hand sidebar, click the link that says “Choose what the power buttons do.”
- Look under the “Shutdown settings” section. You will see “Turn on fast startup,” but the checkbox will be greyed out and locked.
- At the very top of the window, click the shield icon link that says “Change settings that are currently unavailable.”
- The checkbox will now unlock. Click the box next to “Turn on fast startup (recommended)” to completely remove the checkmark.
- Click the Save changes button at the bottom of the window.
The True Power Off
The change is immediate. The next time you click “Shut Down,” Windows 11 will legitimately terminate every single process, clear the RAM, unlock the hard drive partitions, and cleanly power off the motherboard, ensuring maximum compatibility for dual-booting other operating systems.