Recently, I could not see (from the W10 OS) my phones SD card .
Turns out, I had 'pinned' it to Explorers list for
convenience 
.
Rebooting everything had no effect.
Then I unpinned the non-functioning shortcut
Unpin any detachable drives (that no longer work as expected)
I wonder if this is the root of the rash of "can't see SD card or removable devices" W10pro aniv_ed