OK, I did the tests in CoreELEC
USB Write Speed (Patriot Supersonic Rage XT - CoreELEC)
CoreELEC:~ # dd if=/dev/zero of=test.tmp bs=1M count=1024
1024+0 records in
1024+0 records out
1073741824 bytes (1.0GB) copied, 10.429498 seconds, 98.2MB/s
USB Write Speed (Corsair Flash Voyager GT - CoreELEC)
CoreELEC:~ # dd if=/dev/zero of=test.tmp bs=1M count=1024
1024+0 records in
1024+0 records out
1073741824 bytes (1.0GB) copied, 40.401781 seconds, 25.3MB/s
Why is Corsair 4x slower?