Select Startup > UEFI/Legacy Boot and set it to Both.
When the installation is complete, press F1 at startup to adjust the BIOS settings.The next window should ask: Where do you want to install Windows? Select the “Unallocated Space” and proceed with the installation.Boot from your Windows installation USB and select Custom: Install Windows only (advanced).– If you are using macOS High Sierra or later and have the APFS file system, you will need to instead use the following command to resize the APFS container: sudo diskutil apfs resizeContainer disk0s2 125G – If more than one drive is installed in your X220, use the diskutil list command to determine the correct disk number. The remainder will be made available for Windows. – Change 125G to whatever portion of your drive (in gigabytes) you want to allocate to macOS. After reverting any logical volumes, boot into macOS, open Applications > Utilities > Terminal and enter the command below.If the output from this command reveals a logical volume on your physical disk, revert the logical volume by following the steps here.Boot into macOS, open Applications > Utilities > Terminal and enter the following command:.Select the Startup tab and set UEFI/Legacy Boot to UEFI Only and then Save and Exit.Restart the X220 and press F1 to access the BIOS settings.On a computer running Windows, use Rufus to create a UEFI-bootable Windows installation USB using GPT partition scheme for UEFI and FAT32 file system as shown here:.Obtain an installation ISO for whatever version of Windows you want to install.Install macOS by following the steps in the guide.The steps below should allow you to dual boot macOS and Windows from a single drive on the X220, however we cannot provide support for this configuration at this time. Our main guide for dual booting from separate drives can be found here. Dual Boot macOS and Windows from a single drive on the ThinkPad x220
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