I just found this article via a post in ZDnet, it might be important to know about.
Historically in windows, if you're doing mass copying, if you are to decide on say a duplicate file or something, you are overtly notified: a little dialogue box coming to the front of all your windows, notifying you of the problem in a pending operation.
In Windows 10, apparently someone's now omitted that box, so your copy/move job might be suspended and you won't know. Instead, some little red lining goes on your task bar icon (article shows the newfangled 'notice' in a picture). Easily missed.
Edited by brainout, 09 September 2015 - 01:42 AM.