ON LINUX PLATFORM ONLY
Allow NVMe destination drives as long as they are not mounted
except under /media
This does increase the risk of someone accidently selecting an
internal NVMe drive that is not mounted under the current OS
(Linux) but do is being used by the other operating system
(e.g. Windows) on dual boot systems.
But is deemed to be an acceptable risk.
Ref #158
Floris Bos
906ceabaec