I can't comment on how well this works on older generations, but it's definitely not X1 compatible 7th generation carbon. I wish I had tried while I could return it and luckily I had a standard USB stick stashed in my backpack when I needed it. Then why am I rating it 3 stars? Because if you're looking for the 7th gen version, Amazon takes you here and the picture doesn't show the connector well enough for anyone not to be sure to check - it's worth it for me to really rate it, though the problem is an error user rather than the detail error.
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