Hey everyone, I recently picked up a 2008 Mac Pro, and I'm having some problems with USB storage devices. When I connect a USB, the Mac will show it in Finder, on the desktop, and in Disk Utility. If I try to open/browse the device the computer freezes, and the USB gets ejected with a message stating that it was improperly ejected. Then, it no longer shows up in Finder or Disk Utility, but it shows up under System Information. The only way to get it to show back up in Finder and Disk Utility is to force quit the "fsck" activity that shows up under task manager, or to plug it into a different computer (I've been using a Windows 10 tablet) and running a disk repair. And the cycle repeats... The devices worked well on my 2007 iMac and my 2012 MBP Retina, so I couldn't imagine it being an issue with compatibility. I've tried opening them in Windows 10 in Bootcamp, pretty much the same thing happens. It shows up, but I can't browse the device. The only difference is that after it crashes, all lights on the USB turn off like it lost power. I've tried an external HDD that has a power source and I'm getting the same issues. Things that I've noticed: If there are no files on the USB device, I can browse it, but the crashing issue happens after adding at least 1gb of files. The USB devices: 1.) 8gb SanDisk (exFAT); 2.) LaCie Porsche Design 1Tb external HDD; 3.) Western Digital 640gb HDD in an external HDD enclosure. My system: 2008 Mac Pro, 2x Quad Core Xeon processor, 10gb DDR2 667Mhz RAM (I have a couple sticks bringing down the speed), PNY GeForce GT 710 graphic card (confirmed this is not the cause), and I'm running Mac OS 10.11.6. I've reset the SMC and the NVRAM, but those didn't have an impact. Does anyone have any ideas? Thanks in advanced!