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Old root partition has been taken for new installation
After applying the changes in the previous screen, click the drop-down beside New Fedora 18 Installation and you should see the root partition that you are reusing.
If there is a swap partition on the disk, it will be picked up for this installation automatically at this point. Click Finish Partitioning to commit the changes and return to the installation summary.
Note the special EFI boot partition
If you are installing on a UEFI system, it will require a special EFI Boot partition.
If you already have another operating system installed (Windows 8 or some UEFI-capable Linux), you can figure out which partition is already used for EFI boot, and then manually reuse that one by marking it for mount on /boot/efi in the new Fedora installation.
Important: do NOT mark the Reformat box for this file system. Of course, if you don't want to reuse the existing partition, or you don't want to bother figuring out which one it is, you can just make a new partition for this, or just let Fedora make the partitions itself automatically.
After all required input is complete
An important note - when you return to this screen after completing disk partitioning, it will initially still say "Please complete required items...". It takes a short time (5-15 seconds) for anaconda to process and check the changes, then if everything is all right it will remove that message and the Begin Installation button will become active.