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#21
There's a whole thread about it in the Windows Insider Forum . . . This Device is Currently in Use - USB Jump Drive. The guys have given lots of ways to circumvent the problem, most of which would be way above the heads of your average Joe Six Pack user.
I did stumble onto an easy solution, but you'll need to go over there to see how I finally addressed the specific problem.
This Device is Currently in Use - USB Jump Drive