# How does exe.dev measure disk usage?


We look at the filesystem usage of your ext4 filesystem. If you have a VM with
a disk of 25 GB, the most disk usage that this could use is 25 GB,
but less is very likely.

exe.dev will occasionally run `fstrim` or equivalent to all our infrastructure
to reclaim your free space.

The default [`exeuntu`](https://github.com/boldsoftware/exeuntu) is about
4 GB in size. We think a "batteries included" image is a great default,
but if you are optimizing for space, you can build your own smaller image with
the tools you require.