All of a sudden I've run out of space. On my 250GB hard drive, 236GB is used up with only 13GB free.
I used Finder to find big files. Nothing significant.
I used tools like Disk Inventory X, OmniDiskSweeper and Purple Tree, but according to them I've only used up 40GB.
So somehow 200GB is used up, but I can't see where.
Time Machine isn't running (and never has). The disk has no partitions.






Why did this happen? What's the best way to deal with it? It looks like some people just delete these files, but how do I prevent it in the future?
– Nathaniel S Jun 08 '16 at 15:01