Help??
That is the same error message I get when supplemental power is not applied.
In post #28 of this thread, a user indicated that there are several storage-related third party drivers that override the default OS X driver:
CalDigitHDProDrv, HighPointOP, HighPointRR, IOUSBFamily (hacked version) & IOUSBMassStorageClass (2.6.1 legacy?)
He removed them and the card started to work properly.
Admittedly you are not having the exact problem he did; I am just throwing darts blindly here. Do you have the ability to try a fresh OS X Mountain Lion installation on a spare disk? That would eliminate software as the problem.
If you like, I have a spare Orico card I could send you. All I ask is that you send it back after testing. It seems unlikely that it would help as it uses the same Fresco Logic chipset, but PM me if that is something you want to try anyway.
After that, I am out of ideas. I wrote the instructions that worked for me but unfortunately it doesn't make me an expert about what is going on.
Ya get what ya pay for! Don't expect that card to be fast with more than one device connected....
Tesselator, I finally got around to testing this with two HDDs. Yep, you are absolutely right, two ports share the same controller. Used simultaneously, the two drives slowed down dramatically. This is not a good solution for a pro user intending to use multiple ports and drives.
Fortunately my only purpose is occasionally hooking up single USB 3.0 drives that normally sit on other computers, and not being stuck at USB 2.0 speeds.
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