ext4

ext4, or fourth extended file system, is a journaling file system for Linux. ext4’s most common use case is formatting block storage volumes, hard drives, and other computing storage solutions.

ext4 is the default file system for DigitalOcean Block Storage Volumes due to its stability and backwards compatibility.

Partition volumes to divide a single storage device into smaller units that you can manage independently.
After you resize a partitioned volume to increase its available amount of disk, rewrite the partition table and expand the filesystem to use the new space.
Create a new volume from the control panel, format it to create its filesystem, then attach and mount it to a Droplet to use it.