So I noticed today that my rMBP early 2013 512GB SSD was reporting an abnormally small amount of free space ~60GB. Wondering what was taking up space ran Omni it only reports ~250GB being used. Figured I may have some corruption ran Disk Utility, and it found Orphaned Blocks and was not able to calculate free space. Booted to recovery to repair drive and it failed to repair. So booted to my bootable USB and ran disk Utility again and repair was successively. Rebooted to normal boot disk ran Disk Utility again Drive is okay and repaired permissions. Now showing ~110 GB free while Omni shows ~250 GB free. Any idea why the two would be so far off??