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Windows 10 How to detect from within Win10 if "Fast Boot" is enabled (in BIOS)?


Well-Known Member
Oct 17, 2020
Users can disable "Fast" Boot" in BIOS.

But is there a way to check from a running Windows 10 if "Fast Boot" is currently enabled or not?

Assume the local Windows 10 Pro was previously installed WITH enabled "Fast Boot" in UEFI-BIOS.
Later (after installation) I disabled "Fast Boot".
Will this be sufficient to really get rid of "Fast Boot" feature?
Or does an enabled "Fast Boot" flag in BIOS store during Windows 10 installation some irrevocable "Fast Boot" values into Registry?

Fast Boot is a firmware feature that is independent of the operating system. If the operating system can be booted with Fast Boot, it can without Fast Boot. Windows has the Fast Startup feature, where the kernel is hibernated to disk and resumed on next startup while everything else starts new, but that's different. Fast Startup is what frequently causes slower startup, forever shutdowns, crashes while shutting down, and write protection errors while using Windows' partition from Linux. Slower startup is because if you use HDD, the hibernated kernel is likely to be written to the inner tracks closer to the spindle, which is much slower, when the permanent system files are likely to be located near the faster outer beginning of the disk, even if a full startup reads more data.