Is there a TB limit on Macs over USB? Trying to get a 3TB drive to work in a dock over USB and it shows up as a 800Gig drive.

I purchased a StarTech Dual Dock eSata / USB 2.0 model #:SATADOCK22UE. I've tried using it with 3TB drives and it works fine over eSata, but when I plug it in via USB, the drives show up un-initialized and in disk utility, show up as 800Gig drives. I contacted StarTech's technical support and they said this is a limitation in Mac's USB chipset. The max you can plug into USB is 2TB. Is this correct? I've never heard of this before.
I have a Mac Pro 3,1, running Mountain Lion. I tried the dock on a Mac Mini, same thing.

The answer you got is only have right. There are certain limits that limit you to 2.2TB.
It is a limitation in a chipset, but NOT the one in the Mac. It is a limitation of the Enclosure.
The technician who advised you needs additional training.

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