By default, when you click “Shut Down” on a Windows 11 PC, it does not actually power off completely. Instead, it logs you out and then hibernates the core operating system kernel to your hard drive. This feature is called “Fast Startup.” When you turn the PC back on, Windows simply loads that hibernated kernel into RAM, allowing for significantly faster boot times compared to a cold, traditional start.
While this is great for standard laptops, Fast Startup is notoriously problematic for advanced users. Because the Windows partition never truly unmounts, it prevents you from safely accessing your Windows drive from a dual-boot Linux installation. It can also cause severe driver glitches because your hardware never receives a true power cycle, and it complicates accessing the BIOS/UEFI firmware menu during boot. If you rely on dual-booting or simply want the stability of a clean, cold boot every single time, you must completely disable Fast Startup.
Disabling Fast Startup via the Control Panel
Microsoft has hidden this feature deep inside the legacy Control Panel, completely separating it from the modern Windows 11 Settings app.
- Click the Start button, type “Control Panel” into the search bar, and press Enter to open the classic Control Panel.
- In the top right corner of the Control Panel window, change the “View by” dropdown from Category to Large icons.
- Click on Power Options.
- On the left-hand sidebar of the Power Options window, click the text link that says Choose what the power buttons do.
- You will see a list of “Shutdown settings” at the bottom of the page, but the checkboxes will be greyed out.
- Click the administrator shield icon at the top of the page labelled Change settings that are currently unavailable. (Click Yes if a UAC prompt appears).
- The checkboxes at the bottom will now be clickable.
- Find the setting labelled Turn on fast startup (recommended) and click the checkbox to uncheck it.
- Click the Save changes button at the bottom of the window.
The next time you shut down your PC, Windows will perform a complete, traditional shutdown. It will take slightly longer to boot up the next morning, but your hardware will be fully refreshed, and your drive will be safely unmounted for access by other operating systems.