1st August 2017, 14:40
Replying to a post so old (just spotted this one) it might be irrelevant. I had a Sandisk Extreme USB 3 flash drive that would not be recognized on any OS in USB 3 but did work in USB 2 (MSI FM2 mobo) though it ran fine on other PCs. All other USB 3 flash drives worked perfectly including a Sandisk Ultra Fit. Maybe a BIOS issue, though I did have the latest BIOS.