I have a relatively new USB 3 hard disk:
Seagate 2TB Backup Plus Slim Portable External USB 3.0 Hard Drive (Silver)
Also, I have an USB 3 SD card reader. Both of these are known to work faster than they do now. They perform at 40-45 MB/s.
I use USB Device Tree Viewer V3.1.2 and it tells me these, for both devices:
Device Bus Speed : 0x02 (High-Speed)
Flags : 0x02
DevIsOpAtSsOrHigher : 0 (Is not operating at SuperSpeed or higher)
DevIsSsCapOrHigher : 1 (Is SuperSpeed capable or higher)
DevIsOpAtSsPlusOrHigher : 0 (Is not operating at SuperSpeedPlus or higher)
DevIsSsPlusCapOrHigher : 0 (Is not SuperSpeedPlus capable or higher)
My motherboard is ASUS MAXIMUS V GENE and it has two USB 3 options. There is ASMedia USB3.0 eXtensible Host Controller and there is also Intel(R) USB 3.0 eXtensible Host Controller. I never got any device to work at USB 3 speed on the Intel. They don't supply drivers for Windows 10 64bit as it is already included in the OS. Then I started plugging devices to the ASMedia ports, and they worked in the past. But I checked again and now all devices are using USB 2 speeds on these ports too. I think what messed it up was a recent Windows Update. I used IObit Driver Booser which complained that the driver was too old for this controller.
Driver: \SystemRoot\System32\drivers\asmtxhci.sys (Version: 1.16.47.2 Date: 2017-11-28)
No joy, even tried manually installing specific drivers. ASUS has this as "latest driver" on their site: Asmedia_USB3_V1.16.35.1 I downloaded it and installed it. Install is successful:
Driver: \SystemRoot\System32\drivers\asmtxhci.sys (Version: 1.16.35.1 Date: 2016-04-14)
But no USB 3 speeds whatsoever. I ran out of options to try.
Answer
In the end, it turned out that the cable Seagate has supplied with the drive, was bad. Its connection towards the drive was flimsy. I haven't moved it a lot as I thought it was a software issue. I bought a new sturdy cable, thrashed the old, now the connection is very strong and all the USB issues are gone, no matter which blue port I plug into. I also bought a PCI-E card for more USB3 ports and I started using those, just in case.
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