I'm using a 128 GB SSD (Macbook Air 2012 ML) of which about 55 GB was free. Suddenly I get messages that my boot drive is full and I should erase files... This is very weird, as I didn't do anything. Disk Inventory X shows that apart from a 4 GB sleep file, my system is full of SWAP files! As you can see in the image, it's really messed up. Every swap file is 1 GB in size (the large blue area). Is this a bug or something? I know those swap-files are probably gone when I reboot, but this is very annoying. I want to keep my SSD with lots of free space and now OS X is filling it up. I don't know if it's of any importance, but my home folder in on an external Thunderbolt drive. OS X and all programs are the internal SSD. Any suggestions?