Yamaha EAD10 Reference Manual page 55

MENU
File
Format
Format: Format USB Flash Drive
Sometimes the USB flash drives are not usable as they are. In such cases, format the USB flash drive by following the procedures shown
below.
NOTICE
Formatting erases all data in the USB flash drive. Before formatting, ensure that the USB flash drive does not contain any important
data.
Procedure
1.
Connect the USB flash drive into the [USB TO DEVICE] terminal.
2.
Navigate to MENU/File/Format.
The following screen appears.
3.
Press the "FORMAT" button ([F3]).
The Format USB flash drive confirmation screen appears.
EAD10 Reference Manual (Advanced) 55