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