Hammond Skx PRO Reference Manual page 691

Using Memory
671
7. Press the DIRECTION " " button once. The Information Center Display should now look like this:
If there is any data on the USB Flash Drive, formatting the drive will erase it. Therefore if you DO
NOT wish to format the USB Flash Drive, press either the MENU/EXIT or PLAY Touch buttons.
If you wish to proceed with the formatting operation, from the above screen press the ENTER
button. The Information Center Display will display "Formatting...," then after approximately 30
seconds the following message will display:
The USB Flash Drive will be formatted and ready for use.
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SKX PRO Reference Guide