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    Wow, what a great first-time answer Joshua! You sir deserve all the high-fives. I have just tested this myself, and works perfectly!
    – topherg
    Commented May 12, 2016 at 10:37
  • Thanks. What sort of throughput did you get? I've just tried something else, for each USB device (in device manager) change the properties of each From: "Quick removal" to "Best performance". It appears that the files are cached and streamed to the USB sticks when the computer can, rather than the computer waiting for each write to complete. Copied a single 1 GB file to the storage spaces drive in a few seconds. Though could see the USB Flash drives working away for minutes as the actual data was flushed to it. So have to be careful about allowing the cache flush before removal.
    – Joshua
    Commented May 12, 2016 at 21:11
  • as you said, it was INCREDIBLY spiky, but I managed to get about 200MB/s transfer at one point, but then nothing for about 3 mins (my USB hub was whining a lot too). I'm going to experiment with device failure shortly, seeing what happens when I just kill a stick or 2.
    – topherg
    Commented May 13, 2016 at 9:21