When I tried to formate the bootcamp partition to NTFS I got an error message telling me that Windows cannot be installed to this disk. I then chose to boot from the USB and the installation process started. I then restarted the computer manually while holding down the C button. Once booted into Windows, the computer couldn't find the USB that boot camp made. First I made a bootable USB from my ISO file with Windows and let boot camp make the partition and restart the computer. I have tried using bootcamp to run Windows 8.1 on a partition of the drive.
The disk I'm using is a new 'Samsung 850 EVO Series 250 GB' SSD. So I got a 2011 MacBook Pro, running Yosemite version 10.10.2.