Salut,
J'ai trouvé ça :
Has trouble booting up with USBloader GX, just make sure to turn on the external first, and wait 10-15 secs before turning on the Wii. Fails 1 out of 5 times. This is due to the multiple ports most likely. However, this drive does have a very fast transfer speed during PC transfers because of the other fast ports. It's worth the buy regardless, and it's very quiet and efficient.
ici :
USB Devices Compatibility List - WikiTemp
Ca concerne ton DD Western Digital My Book Home Edition. Je sais pas si ça peut aider, mais bon...