- Turn off the PC, and put in the Windows installation DVD or USB key.
- Boot the PC to the DVD or USB key in UEFI mode.
- From inside Windows Setup, press Shift+F10 to open a command prompt window.
- Open the diskpart tool:
diskpart
- Identify the drive to reformat:
list disk
- Select the drive, and reformat it:
select disk <disk number>
clean
convert gpt
exit - Close the command prompt window.
- Continue the Windows Setup installation.
When choosing an installation type, select Custom. The drive will appear as a single area of unallocated space.
Select the unallocated space and click Next. Windows begins the installation.
windows
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