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USB3 drive freezes after copying large amounts of data


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So I have a bit of an odd problem I've not run into before. I picked up a pair of 5Tb Seagate external USB3 drives to use as an off-site backup. I can transfer around 40Gb before it stops responding and I have to unplug and re-plug the drive. This happens with both drives. I don't often copy this volume of data. Mostly it's limited to copying movies and other smaller items to a USB stick or something and USB3 has always worked fine otherwise. 

 
System Specs:
Gigabyte GA-X79-UP4
Intel i7 4930k
Mac OS 10.10.3 with clover boot loader and rampagedevs dmg package.
 
From what I can tell it uses a pair of Fresco FL1009 USB3 chips.
 
I tried the drives in my Macbook Pro Retina and it worked flawlessly at USB3 for a terabyte, no issues. 
If I connect it to the USB2 port, it works fine as well, but is pretty slow (Currently at 600Gb in 6 hours :P)
i'm pretty sure I've been able to copy 3Tb or so of data on this computer before when I was on Mavericks and it worked ok (I think, but that was with a Western Digital external. My plan is to try that once this is done copying)
 
Anyone run into this before? I'm not opposed to getting a PCIe USB3 card if I knew that would make USB3 work properly. 
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You need to find out what the USB3 controller is on the drive enclosure itself. I had similar issues with an external USB dock that used a JMicron chipset. Worked fine at 2.0, worked better in OS X than Windows at 3.0 but would disconnect during large file transfers.

 

After trying multiple fixes and firmwares the solution was to throw it away and buy a dock with a better chipset (ASMedia in this case).

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