Boot Camp: "We couldn't create a new partition or locate an existing one" alert during Windows 8 install

"We couldn't create a new partition or locate an existing one" alert appears during a Microsoft Windows 8 installation.

This can happen if any Thunderbolt or USB storage devices--other than the USB media that contains a Windows ISO installer--are connected to the computer during the install process.

  1. Shut down your computer.
  2. Disconnect all Thunderbolt and USB storage devices, except for the USB media which contains the Windows ISO installer.
  3. Try the installation again.

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