Typically, you will see a brief note at the bottom or top of the screen indicating what the key is. One such screen is visible to the right, note the legend in the top-right corner indicating F2 will start the BIOS setup and F12 will present the boot selection menu. This key changes from PC to PC, it all depends on your PC’s make and model. Dell, Lenovo, HP, Toshiba, Samsung, ASUS, Acer, Gateway, etc.) shows up on your BIOS splash screen, you will have the option of pressing a special key. Immediately after powering up your PC, as soon as the manufacturer logo (e.g. Notice the key guide in the top-right corner. On most EFI computers, you’ll need to access EFI setup immediately after turning on your PC in order to see the option of enabling UEFI boot, usually as an option under the boot options section of the BIOS configuration. If legacy boot mode (also known as “CSM boot”) is enabled, UEFI boot mode is automatically disabled or de-prioritized.īelow are instructions for turning off Legacy Boot on most PCs and laptops, as well as specific instructions for certain brands of laptops. On PCs and laptops from most manufacturers, including Dell, HP, Asus, Acer, Toshiba, Lenovo, and more, Legacy Boot can be disabled or turned off from the EFI setup/configuration feature, available immediately after turning on your PC.

Legacy boot mode does not normally support partitions greater than 2TB in size, and can cause data loss or other problems if you try to use it normally.

The regular way of booting into software and operating systems is called “Legacy Boot” and must sometimes be explicitly enabled/allowed in the BIOS settings. With newer Windows 8 PCs that are designed with UEFI support, the BIOS or firmware often has an option that specifies if the computer can boot into regular operating systems and recovery tools, or if it can boot exclusively into newer UEFI operating systems and environments.

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