So some rocks are radioactive because they have radioisotopes in their nuclei. Also they may have radon gas trapped in their crystals if they are igneous rock. They could also be radioactive due to the fact that the atom of the rock is unstable.
Connecting USB Devices Manually. Choose VM > Removable Devices to connect specific USB devices to your virtual machine. You can connect up to two USB devices at a time. If the physical USB devices are connected to the host computer through a hub, the virtual machine sees only the USB devices, not the hub.
1 Connect an external USB drive to the Hyper-V host. 2  The disk will appear in a system and a certain drive letter will be assigned to it. 3  Open the Disk Management (diskmgmt.msc) console, right-click the drive (the left column, in our example, the ID of the 30 GB USB drive is Disk 2) and select Offline.