Description of problem:
Installing Fedora 22 KDE to Samsung NP550P5C Laptop, UEFI. Target disk is a Seagate ST1000DM 1TB drive attached via USB through a Nextar CX External USB 2.0 disk chassis.

Version-Release number of selected component:
anaconda-core-22.20.6-1.fc22.x86_64

The following was filed automatically by anaconda:
anaconda 22.20.6-1 exception report
Traceback (most recent call first):
  File "/usr/lib64/python2.7/site-packages/parted/disk.py", line 248, in addPartition
    constraint.getPedConstraint())
  File "/usr/lib64/python2.7/site-packages/parted/decorators.py", line 41, in new
    ret = fn(*args, **kwds)
  File "/usr/lib/python2.7/site-packages/blivet/partitioning.py", line 390, in addPartition
    constraint=constraint)
  File "/usr/lib/python2.7/site-packages/blivet/partitioning.py", line 844, in allocatePartitions
    _part.req_start_sector, _part.req_end_sector)
  File "/usr/lib/python2.7/site-packages/blivet/partitioning.py", line 515, in doPartitioning
    allocatePartitions(storage, disks, partitions, free)
  File "/usr/lib/python2.7/site-packages/blivet/autopart.py", line 473, in doAutoPartition
    doPartitioning(storage)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/kickstart.py", line 337, in execute
    doAutoPartition(storage, ksdata, min_luks_entropy=MIN_CREATE_ENTROPY)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/kickstart.py", line 2059, in doKickstartStorage
    ksdata.autopart.execute(storage, ksdata, instClass)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/ui/gui/spokes/storage.py", line 326, in _doExecute
    doKickstartStorage(self.storage, self.data, self.instclass)
  File "/usr/lib64/python2.7/threading.py", line 766, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/threads.py", line 238, in run
    threading.Thread.run(self, *args, **kwargs)
PartitionException: Unable to satisfy all constraints on the partition.

Additional info:
cmdline:        /usr/bin/python2  /sbin/anaconda --liveinst --method=livecd:///dev/mapper/live-base
cmdline_file:   BOOT_IMAGE=/isolinux/vmlinuz0 root=live:LABEL=Fedora-Live-KDE-x86_64-22_B-T5 ro rd.live.image quiet rhgb
executable:     /sbin/anaconda
hashmarkername: anaconda
kernel:         4.0.0-0.rc4.git0.1.fc22.x86_64
other involved packages: pyparted-3.10.3-1.fc22.x86_64, python-blivet-1.0.5-1.fc22.noarch, python-libs-2.7.9-5.fc22.x86_64, anaconda-gui-22.20.6-1.fc22.x86_64
product:        Fedora"
release:        Fedora release 22 (Twenty Two)
type:           anaconda
version:        Fedora