Roland Octapad SPD-20X Owner's Manual page 69

How to Format SD card
If you want to delete all the patches on SD card, it is suggested to use format function.
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All data on SD card will be formatted, including other files you stored on it. Please make backup for
NOTE
your files if necessary.
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Press [EDIT] to enter the Edit mode.
Press [SELECT] or [SYETEM] to select SD CARD.
Use PATCH/VALUE [-] or [+] to select FORMAT. Press [ALL/ENTER]
The following confirmation screen will be shown.
Format SD Card
Use PATCH/VALUE [-] or [+] to toggle between 'Yes' and 'No' , press [ALL/
ENTER] to confirm
Sure? Yes