Hello, Something is chewing up my hard drive, and I don't know how to fix it. Running 10.9.5, 2011 MacBook Pro 17", 2.2 GHz i7, 8GB RAM, 750 GB hard drive. Finder tells me that I have 31 GB of space left on my hard drive (left side in screenshot). I did "Get Info" on every folder, and they do not add up to anything close to using that much space. GrandPerspective tells me 478 GB is used up in Miscellaneous Used Space (window on the right in screenshot). System Profiler tells me that 587 GB is used for "Other" (center-top in screenshot). I ran "sudo du -cxhd 1 /" in the Terminal, which revealed that /System is using 481 GB (center-bottom in screenshot), however, Finder tells me that /System is only using 5.73 GB (second from left side in screenshot). Rebooting did not fix this problem. Trash is empty. A few days ago, I had a problem with my external Time Machine backup drive spontaneously disconnecting during backup. I wonder if there are corrupted Time Machine backups somewhere in the system, but I am unable to find any. Can anyone help me figure out what is eating up all this hard drive space and how can I delete it?