ISE Preview: USB drive shows up twice in Get-PSDrive
This should speak for itself:
PS C:/tmp> get-psdrive -name 'I'
Name Used (GB) Free (GB) Provider Root CurrentLocation
i 52.88 5.99 FileSystem i:\ BUILD 2016
I 52.88 5.99 FileSystem I:\
Maybe this is related to inserting the USB key while ISEP was running?