Roland recommends formatting a USB key on the JUNO-DS before using it - here are the steps:
Note: Formatting a USB Key will erase all data. Back up any important information on your USB key to a computer before proceeding.
- Press MENU.
- Cursor to "UTILITY" and press ENTER.
- Cursor to "FORMAT USB MEMORY" and press ENTER.
- Cursor to "OK" and press ENTER.