FS50: How to format your SD card
If your SD card or internal memory is full, formatting it will delete all scanned images and other files saved to your SD card or internal memory.
*To format the internal memory, follow these steps with the SD card removed.
In the Main Menu, go to FORMAT. Press the OK button.
When prompted if you would like to format the SD, use the < button to choose “Yes”. Press the OK button to begin formatting the SD card.
You will be returned to the main menu when formatting is complete.