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Select existing to overwrite
This is the initial view of the existing disk partition layout.
Don't be confused or intimidated by my rather large number of partitions, a more typical one will probably have something like one to four partitions, depending on what is already installed.
If you want to reuse an existing partition, click the drop-down for that installation in the list. Then select the partition you want to reuse, and its details will be shown at the right side of the window.
In the Mount Point input box, enter what you want to use this partition for (it is / in this case). You must also click the drop-down for Customize... and then click the Reformat box, and then click Apply Changes.
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.