We Couldnt Create A New Partition. It has worked for many of our readers and we are very sure that one of them will work for you if you try them. Solved: Setup was unable to create a new system partition or locate an existing system partition.
If you get the "We couldn't create a new partition" on USB drives, try following solutions to fix it easily. Please see How to install Windows using Boot Camp - Apple Support and Boot Camp: Creating an ISO image from Shrinking partition for Physical Volume and adding new partitions. Solved: Setup was unable to create a new system partition or locate an existing system partition.
Thus the installer cannot create a new partition on that device.
A problem occurred; undoing all changes.
You can use a DVD and create an ISO, if required. I got the "We couldn't create a new partition or locate an existing one" error, which i spent a significant amount of time trying to search for a solution. Please see How to install Windows using Boot Camp - Apple Support and Boot Camp: Creating an ISO image from Shrinking partition for Physical Volume and adding new partitions.