Can't use both USB ports with WiiXplorer and d2x-v10-beta53-alt

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What steps will reproduce the problem?
1. Install d2x-v10-beta53-alt to slot 220
2. Connect USB HDD to the usual port and a USB stick to the second port
3. Launch WiiXplorer using slot 220 

What is the expected output? What do you see instead?
I expect to be able to access my USB HDD and, after enabling the Both USB Ports 
option in WiiXplorer, to be able to access a USB stick plugged into the second 
port as well.

What happens is that the USB HDD constantly spins up and down and WiiXplorer 
can't see it or the USB stick.

What version of the product are you using? On what operating system?
d2x-v10-beta53-alt
WiiXplorer v248

Please provide any additional information below.

Original issue reported on code.google.com by dangermo...@gmail.com on 14 Mar 2013 at 7:18