When I try to create a Windows XP partition with the Boot Camp Assistant, I get this error message: "Your disk cannot be partitioned because some files cannot be moved. Back up the disk and use Disk Utility to format the disk as a single Mac OS Extended (Journaled) volume. Restore your information to the disk and try using Boot Camp Assistant again." I have never partitioned my drive previously, and according to Disk Utility, my disk is already a "Mac OS Extended (Journaled) volume." I have also tried to repair the disk with Disk Utility, but it told me that no repairs were needed. Is there any way around this, or do I have to format to get it to work?