F22 Final TC1 delete of "old" disk for installation of new build not possible

Thu Apr 30 05:57:04 UTC 2015

Hi,
downloaded F22 Final TC1 workstation x86_64. usb creator - usb flash medium - loaded to Acer E15 laptop. Tried to install on external disk with F22 Beta 3.
Delete of "old" partitions not possible. "Speicherplatz zurückgewinnen" not high lighted. See Foto attached.
Kind Regards
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