At first encounter this problem, the situation is such that a normal power off and then on, the mechanical hard disk does not recognize optical drive, restart the normal boot is recognized, and I go online Baidu, the answer is this, I tried, does not work well!
It was only later found to an article Great God, can not find a specific article, but the solution to the problem is to turn off Quick Start Power Options, win10 default this option is turned off as long as you can, look for the method is this:
After switch off, reboot this problem is solved, the truth on their own experience of it!