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If you select Delete All, press the center key of the Navigation
pad to display the submenu.
3. Press the Navigation pad to select √ and then press the
center key of the Navigation pad to delete.
4. Press the MENU button again to exit the menu.
Note: Once deleted, files cannot be recovered so make sure
you have a backup before you delete. Files that have been
protected will not be deleted. You have to unlock the files first
before deleting them.