The extHD should be Plug-n-Play so you should be okay. I also have 4 USB ports, but all 1.1 and all in use. So having an extra couple ports (especially 2.0) fits the bill =)
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Cheers,
Dan
Founder and CEO
LionsGate Creative
GoodPassRobot
Magelln
----
Cheers,
Dan
Founder and CEO
LionsGate Creative
GoodPassRobot
Magelln