Updated today 22/7/2017, only issue so far is Video, the Update nVidia came up , installed everything is now back to normal. Audio, Video, USB all A OK.
I list my build in my Profile\.
Had the same issue on my MacBook pro Sierra, It is a new Scandisk 16gig Ulta USB 3.0. pre formatted with Boot partition and FAT. I tried many time.
In the end I took it over to my OLD 2009 iMac running El Capitan and it erased /formatted first time.
Don't know its just an issue with the Sierra...
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