USB mass storage device tester by svpe is a small application that:
looks for any USB mass storage devices connected to the Wii
tries to display a file listing of the root folder
creates a file called testtest.txt with the content 'test' there.
Warning
FOR FAT (16 AND 32) DEVICES ONLY
USING THIS ON ANY DEVICE THAT HAS A NON-FAT FILESYSTEM ON IT WILL RESULT IN DATA CORRUPTION
CREATE A BACKUP BEFORE USING THIS SOFTWARE
You can use Wiimote or GameCube controller. (Even though it says GameCube only.)
Fuente: Wiibrew
OK. Perdon no lo habia visto, ya he reportado para que eliminen el hilo.