randallphoto Posted April 26, 2015 Share Posted April 26, 2015 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 ) 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. Link to comment Share on other sites More sharing options...
Riley Freeman Posted April 26, 2015 Share Posted April 26, 2015 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). Link to comment Share on other sites More sharing options...
randallphoto Posted April 26, 2015 Author Share Posted April 26, 2015 Only thing that is weird though is that I can connect the drive to my Macbook Pro Retina with USB3 and it works flawlessly. Maybe it's an incompatibility between the enclosure chipset and my motherboard USB3 chipset.. Link to comment Share on other sites More sharing options...
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