What did happen to me was strange.
1-I have 2 WD elements.
They worked fine.
2- I did try shut up the computer with several folders open in one of the external drives.
3- I noticed the computer was not shutting down. I turned power off.
4- Next time I did boot the windows started…,but at a certain point it did freeze.
When I disconnect one of the drives ( the one in which I had the several folders open ) , computer does boot.
5- The drive that prevent the computer from booting , works fine when attached after computer booted.
Something did happen when I failed to close all folders and documents in one of the WD disk.
The other works fine .
What could possible went wrong ?