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you can boot from the USB Live Medium and when there is partitioning during install you can remove all old partitions. (Reclaim additional space). I always used automatical partitioning afterwards.

Automatically configure partitioning - If this option is selected, then after you press Done in the top left corner of the screen, the installer will determine the total amount of space on all selected disks, and it will create a Logical Volume Management (LVM) layout suitable for your system. The specifics of this layout depend on whether your system uses BIOS or UEFI firmware, the total amount of free space on your disks, and the amount of RAM on your system (which determines the size of your swap space). With automatic partitioning, you can also select the I would like to make additional space available option below. Use this option if you want to reclaim space from an existing partitioning layout - for example, if a disk you want to use already contains a different operating system, and you want to make this system's partitions smaller to allow more room for Fedora. The Reclaim space dialog which opens if this option is selected is described later in this section.

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If you selected automatic partitioning and the I would like to make additional space available, or if there is not enough free space on your selected hard drives to install Fedora, the Reclaim Space dialog will appear. This dialog lists all disk devices you have configured and all partitions on those devices. The bottom right corner of the dialog displays information about how much space the system needs for at least a minimal installation and how much space you have reclaimed. Warning If you use the Reclaim Space dialog to delete a partition, all data on that partition will be lost. If you want to preserve your data, use the Shrink option, not the Delete option. First, review the displayed list of available storage devices. The Reclaimable Space column shows how much space can be reclaimed from each entry. To reclaim space, select a disk or partition, and press either the Delete button to delete that partition (or all partitions on a selected disk), or Shrink to use free space on a partition while preserving existing data. Alternatively, you can press Delete all in the bottom right corner; this will delete all existing partitions on all disks and make this space available to Fedora, but all existing data on all disks will be lost. After you free enough space for your Fedora installation, press Reclaim space to finish.

(see https://docs.fedoraproject.org/en-US/Fedora/25/html/Installation_Guide/sect-installation-gui-storage-partitioning.html