From Fedora Project Wiki
- In the Storage editor modal dialog, delete all existing partitions (if any).
- Create any necessary bootloader partitions (e.g. EFI System Partition for UEFI installs, BIOS Boot partition for BIOS installs onto a GPT disk, PReP boot partition for PowerPC installs). The screen should indicate what partitions are required and/or recommended on the right-hand side.