Bootcamp: "can't partition the disk" error but disk space is not the issue

Hi all - I'm attempting to install Windows via the BootCamp assistant on a new 27" iMac. When trying to partition the disk with BootCamp Assistant, I get the message:
"The disk cannot be partitioned because some files cannot be moved. Back up the disk and use Disk Utility to format it as a single Mac OS Extended (Journaled) volume. Restore your information to the disk and try using Boot Camp Assistant again."
The iMac does have a single volume, and it is Journaled. In researching this online, it appears that the culprit is generally having too little disk space for Boot Camp Assistant to do its job. But in this case I have a new computer with a 2 TB drive and 1.4 GB of free space, and I'm trying to create only a 250 GB NTFS partition.
I'm really not eager to delete my 2 TB drive and restore 600 GB from a Time Capsule backup unless it is absolutely necessary. Is there some other explanation for this or solution?

I have solved the issue and wanted to follow back up to record the resolution. In my case, it turned out to be an error with the disk catalog record. While trying all available options, I decided to reboot my computer from the Snow Leopard installation disc and run Disk Utility. A "verify disk" test reported that the disk needed to be "repaired." After using "Repair Disk" and restarting, Boot Camp Assistant was able to partition the disk successfully.
Thanks for the other suggestions - I think they will be useful for others.

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