This piece was originally posted on gdgt. Check it out, here.
Apparently, my computer is going crazy because I have ZERO disk space left. What in the what?! Turns out, my problem stems from iTunes insane backup system. I have multiple redundant multi-gigabyte iOS backup folders eating all my space.
A few minutes ago, I had 0 bytes free out of 120GB SSD. (After deleting the iOS backups, I now have 12.5 GB free).