After you have used your USB to try or install Endless, you can reformat it so that you can reuse it for regular file storage.
To do this, you must use a tool that lets you reset the partition table of the device.
- Search for "Disks" on the desktop and start the Disks utility.
- Find your USB disk on the left, and then at the top right, click the ☰ menu icon, then select "Format".
- The defaults ("Don't overwrite existing data (Quick)" and "Compatible with all systems and devices (DOS/MBR)") are OK, so hit "Format".
- Hit the + icon to create a partition for your data. It will default to creating one partition which takes the whole disk, so just choose "Don't overwrite existing data (Quick)" and then "Compatible with all systems and devices (FAT)" and hit "Create".
- Download a tool such as Rufus which allows you to repartition and format USB disks.
- Run Rufus and select your USB drive. Leave Partition scheme as "MBR"... and File System as "FAT32" and ensure that only "Quick format" is checked.
- Hit "Start".