Question: I'm trying to start some very large Containers on Docker Toolbox (about 18 GB in total). Unfortunately, I always get the error that there is not enough disk space. I have a 1TB HDD and there are more than 200 GB free.

How can I increase the disk space for docker toolbox?

Answer: 
OK, I finally found the solution:

Open Docker Quickstart Terminal, remove the virtual docker-machine and add a new one:

```
 $ docker-machine rm default
 $ docker-machine create -d virtualbox --virtualbox-disk-size "100000" default

```
In my case I had a lot of stopped containers, images and volumes - eating up space. Below commands help:

`docker container prune`

`docker volume prune`

`docker image prune`