Crashing with message: "There is no disk in the drive. Please insert a disk into drive \Device\Harddisk3\DR3

It’s an odd one. Seems to happen when I am writing data or adding an actor to a blueprint or the like. Happening in 4.3 only it seems. It’s happened in multiple projects as well.

Check out this post:

I think that was it, I had a USB stick mounted and UE4 didn’t like it.