I posted this in another thread but have had no replies so I have an Early 2009 Mac Pro 4,1 which I've recently upgraded with a powered Orico PFU3-2P - in a 4x slot, power comes from nearest SATA connector via an adaptor. I'm using a LaCie Rugged SSD drive to work from. But with the LaCie connected over USB3 to the Orico, sooner or later the drive will hang and the Finder becomes more-or-less unusable until I pull the plug on the LaCie. It won't even shut down the Mac until the USB cable is pulled. Last time the hang somehow tripped a second drive (connected via Firewire) to hang as well, until the USB3 was pulled. By 'hang' I mean there's a spinning disc in the bottom right corner of the finder window and a beachball when I mouse over it. I have tested the LaCie over USB3 and Thunderbolt on my MacBook Pro and it behaves normally (it's not just the drive) . I've tested an older external drive (Non SSD) over the USB3 on the Mac Pro and that behaves normally (its not just the Orico) . I've installed a new OS X on another internal drive and the problem persisted (it's not just my OS or OS drive). The problem seems to be unique to the combo of the Orico and the LaCie SSD. I was really hoping to streamline my workflow with this external SSD, as I work across the two machines a LOT. If anyone can shed any light on what might be causing the hangs, I'd be very grateful. Thanks.