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I have a epia M10000 and my solution for the usb hub staying powered up is this. And, keep in mind, mine is internal so accessing the usb wire was much easier than if it were external, but the same theory. All of my USB's appear to have constant power without this relay setup.
Cut the usb's red wire that runs to the motherboard, and connect it to the switched portion of the relay. Normally open contacts
Wire the relay coil to one of the molex connectors...5v or 12v depending on which relay you got. Mine was 5v.
When you turn on the pc, it fires up the buss and thus turns on the hub. Mine works great, never had a single problem. I have not had to install a cap or diode either. Your mileage may vary!
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00 Focus LX soon to be boosted!
88 Escort GT Turbo DFI
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