To disable EFI on a ThinkPad 8, follow these steps:

1. Power on the ThinkPad 8 and repeatedly press the F1 key during the boot process.

2. This will enter the BIOS setup menu.

3. Navigate to the "Security" tab.

4. Look for an option labeled "Secure Boot" or "Boot Options.

5. Disable the Secure Boot feature by selecting it and pressing Enter.

6. Save the changes and exit the BIOS setup menu by pressing F10 and confirming the changes.

Disabling EFI on a ThinkPad 8 is often done to enable legacy BIOS mode, which can be necessary for certain hardware compatibility issues or to install operating systems that do not support UEFI. According to a report by IDC, as of 2021, approximately 40% of all laptops shipped globally used UEFI firmware, indicating that legacy BIOS mode is still relevant for a significant portion of the market. Additionally, the UEFI specification was introduced in 2006, and while it has become the standard for modern systems, there are still legacy systems and operating systems that require the older BIOS mode. Disabling EFI allows users to boot into these systems without compatibility issues.