I tried using Docker for Mac and there seemed to be an unresolved bug wherein Docker would keep consuming disk space until there was none left. So I ditched Docker for Mac and went to plain Docker Toolbox, but the same problem seems to be happening here, the disk.vmdk file just keeps getting bigger and bigger, even when images/containers are removed.
There is a SO thread about exactly this issue: http://stackoverflow.com/questions/36799718/why-removing-docker-containers-and-images-does-not-free-up-storage-space-on-wind
Has there been any progress on how to fix this problem? If I get rid of default it will take like 6+ hours to rebuild my image from scratch 
Using:
- Docker version 1.12.3, build 6b644ec
- OSX 10.10.5 (Yosemite)
Thanks