Reclaim-Purgeable-Space-on-Mac
- open terminal
- mkdir ~/largefiles
- dd if=/dev/random of=~/largefiles/largefile bs=15m
- cp ~/largefiles/largefile ~/largefiles/largefile2
- repeat step 4 but with a different file name, largefile3, for example
- wait for 5 mins, control + C
- see message 'disk critically low'
- rm -rf ~/largefiles/