Yamaha DTX-PRO Owner's Manual page 26

Setup Guide
Using a USB Flash Drive

Formatting the USB Flash Drive
Some USB flash drives should be formatted with this instrument before they can be used. For information on how to format
the USB flash drive, refer to the Reference Manual (PDF). (MENU/File/Format)
NOTICE
The format operation erases any previously existing data. Make sure that the USB flash drive you are formatting does not
contain any important data.

To Protect Your Data (Write Protection)
To prevent important data from being inadvertently erased, write-protect the USB flash drive. When you are saving data to
the USB flash drive, make sure you disable the write-protect first.
22 DTX-PRO Owner's Manual