USB Loader GX requires a (not shared with other purposes) for reliable operation due to the Wii’s limited USB stack and power delivery. Not all USB drives work. Compatibility depends on three factors: controller chipset, power draw, and partition scheme . This report lists confirmed compatible drives, incompatible drives, and technical workarounds.
USB 3.x drives failing to downgrade to full-speed USB 2.0 mode (12Mbit/s control transfers). Wii expects USB 2.0 mass storage class with 512-byte sectors. usb loader gx usb compatibility list exclusive