{"id":3614,"date":"2016-03-02T09:15:15","date_gmt":"2016-03-02T15:15:15","guid":{"rendered":"http:\/\/neosmart.net\/wiki\/?p=3614"},"modified":"2023-09-20T11:28:24","modified_gmt":"2023-09-20T16:28:24","slug":"enable-uefi-boot","status":"publish","type":"post","link":"https:\/\/neosmart.net\/wiki\/enable-uefi-boot\/","title":{"rendered":"Disable Legacy Boot Mode and Enable UEFI"},"content":{"rendered":"

Newer Windows 10 or Windows 11 PCs might require you to manually enable legacy boot mode<\/a> in order to boot into older operating systems or bootable tools and utilities. However, when you’ve finished with those applications, it’s often necessary to re-enable UEFI booting to resume using your PC normally.<\/p>\n

What is Legacy Boot Mode<\/h2>\n

With newer Windows 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. The regular way of booting into software and operating systems\u00a0is called “Legacy Boot” and must sometimes be explicitly enabled\/allowed in the BIOS settings. Legacy boot mode does not normally support partitions greater than 2TB in size, and can cause data loss or other problems<\/a> if you try to use it normally.<\/p>\n

Enabling\u00a0UEFI\u00a0Boot Mode<\/h2>\n

On PCs and laptops from most manufacturers, including Dell, HP, Asus, Acer, Toshiba, Lenovo, and more, Legacy Boot\u00a0can be disabled or turned off\u00a0from the EFI setup\/configuration feature, available immediately after turning on your PC. If legacy boot mode (also known as “CSM boot”) is enabled, UEFI boot mode is automatically disabled or de-prioritized.<\/p>\n

Below are instructions for turning off\u00a0Legacy Boot on\u00a0most PCs and laptops, as well as specific instructions for certain brands of laptops. 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\u00a0UEFI boot,\u00a0usually as an option under the boot options section of the BIOS configuration.<\/p>\n

Entering the UEFI setup<\/h3>\n
\"Dell<\/a><\/p>\n

Notice the key guide in the top-right corner.<\/p>\n<\/div>\n

Immediately after powering up your PC, as soon as the manufacturer logo (e.g. 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.\u00a0This key changes from PC to PC<\/strong>, it all depends on your PC’s make and model.<\/p>\n

Typically, you will see a brief note at the bottom or top of the screen indicating what the key is.\u00a0One such screen is visible to the right, note the legend in the top-right corner indicating\u00a0F2<\/kbd>\u00a0will start the BIOS setup and\u00a0F12<\/kbd>\u00a0will present the boot selection menu.<\/p>\n

Some common options include the\u00a0F2<\/kbd>,\u00a0F8<\/kbd>,\u00a0F12<\/kbd>, and\u00a0Del<\/kbd>\u00a0keys.\u00a0However, it could be any of the dozens of\u00a0other keys on your keyboard.<\/p>\n

Turning off\u00a0Legacy Boot Support<\/h3>\n

Once inside the UEFI setup and configuration section, you’ll be presented with a number of options and parameters that can be configured for the firmware environment.\u00a0The option you’re looking for has many names, (depending on the make and model of the PC or laptop and the EFI firmware). Some of the possible setting names you’re looking for are listed below, along with their possible configurations, the\u00a0bold<\/strong> values are what should be selected.<\/p>\n