Given that I'm soon installing Windows 10 I decided to move stuff I want to safe places as I'll be doing a clean install, having never re-formatted my drive. As such, my (D: ) partition was emptied. I have nothing left in it, I even checked to see if there's hidden folders or something, there aren't.
However... my computer seems to think that there are still 16.2 GB in there !?!?
And I also checked the other partition, (E: ), and everything seems ok in there (though that one is not empty yet). Does anyone have any idea of how this happened?