GPT disks use Unified Extensible Firmware Interface (UEFI). Most new systems ship with UEFI as the default configuration. UEFI utilizes the partitioning scheme called GPT which is currently not supported.
After converting to an Primary Boot Record disk, you will need to switch to Legacy BIOS mode to be able to install the TMFDE agent on the system. This requires a reinstallation of the operating system. Part of Microsoft’s hardware requirements for Windows 10 has made this switch optional to computer manufacturers.
If the pre-install check fails the partition type check, do the following:
Follow the steps in the Microsoft KB article on how to switch to an Primary Boot Record disk.
Follow these steps to disable UEFI Secure Boot:
- Restart the computer then enter the BIOS Setup.
- Using the right arrow key, navigate to the Security menu. Using the down arrow key, select Secure Boot and then press Enter.
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- Using the down arrow key, modify the setting to Disabled and then press Enter.
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Follow these steps to enable Legacy Boot:
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Using the right arrow key, navigate to the Startup menu then use the down arrow key to select UEFI/Legacy Boot then press Enter. Select Legacy Only then press Enter.
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You may be prompted that the machine will no longer be able to boot after switching to Legacy mode.
- Press F10 to accept the changes and use the left arrow key to select Yes. Press Enter to exit and save the changes.
- Proceed with reinstalling the operating system of the device.
