If you're looking to format your storage device, you can do so directly from the camera's web UI. This is the recommended method to ensure that the storage device you are using is compatible with the RedEdge.
RedEdge requires the SD cards to be in FAT32 format. For Altum, exFAT or FAT32 both work. However, formatting the USB drive with Altum will re-format it to FAT32.
Step by step on how to format your storage device using the web UI:
1. Click on the settings page (gear icons on the top right)
2. Scroll down and click on "Storage and Firmware", then click "Reformat Storage"
3. You will see a prompt confirming this action. Be sure to save all your information before doing this, as this action is not reversible.
4. Wait until you see a confirmation message that the reformatting was successful as you see below:
NOTE: The "Storage and Firmware" option in the Settings page is only available on RedEdge firmware v4.2.0 or higher. If you are below v4.2.0, you will need to update your firmware.