For the FP‑E50, you can use a commercially available USB flash drive with a capacity of up to 32 GB that have been formatted on a computer (FAT32/MS-DOS(FAT)) or on the piano itself ([MENU] > Utility > Format USB Memory).
For the FP‑E50, you can use a commercially available USB flash drive with a capacity of up to 32 GB that have been formatted on a computer (FAT32/MS-DOS(FAT)) or on the piano itself ([MENU] > Utility > Format USB Memory).