All of my drives show up as "safely remove" items in the right click USB menu. If I disable hotplug in the BIOS they are no longer listed there but then I can't read any files from a thumb drive or an external USB DVD drive. In my X58 build there was an option to uncheck and the drive no longer appeared there (I had a HDD for my C: drive then).
EVGA X99 Classified
Intel i7-5960X
64GB Corsair Dominator 2400MHz DDR4