I'm running Mavericks 10.9 on a 2011 MacBook Pro. I have 2TB Western Digital Firewire 800 drive that contains my Aperture Masters and an Aperture Vault. The two directories combined equal 1.1TB, yet the system reports the disk as only having 249GB free. I have done all the usual stuff suggested after having spend quite a bit of time here poking around already - Verify, Repair, show hidden files, emtpy the trash, startup in recovery mode and use disk utility, run Daisy Disk...etc.
I'm fresh out of ideas.
Any suggestions as to things to try that I have not thought of or found already would be greatly appreciated.
This was the solution to my problem.
A little Terminal kludge and some barely eloquent syntax trial and error...and viola.
I now show 1.1TB of space free, as it should be.