Fix bootcamp partition error 'files cannot be moved'
1. Reboot the Mac into Single User Mode by holding Command+S during boot
2. At the command prompt, type:
/sbin/fsck -fy
3. When fsck is complete, type "exit" or "reboot" to reboot
4. Boot the Mac as usual, verify the disk again in Disk Utility, and partition as usual
Source: http://osxdaily.com/2012/03/05/fix-pa...