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Just wanted to add that I downloaded and ran pfix after seeing this post, and it's working for me now as well - the USB dock works plugged into the USB 3.0 ports on my motherboard and I managed 103.0MB/sec write and 104.8MB/sec read testing with AJA System Test.
I've installed the LaCie drivers, replaced the PXHCD inside the PXHCD.kext and restarted, and USB Super-Speed bus is showing up in System Profiler. But I still get this error message showing up in the dmesg log: PXHCD 0x82e98000::UIMCreateControlTransfer - Super Speed device other than LaCie is not supported - Vendor ID[152d] I'm trying this with a Vantec USB 3.0 Hard drive dock, and using a Gigabyte X58A-UD3R motherboard. The dock works fine at USB 2 speeds plugged into one of the USB 2 ports. Any ideas?