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 your device to your computer using a USB cable. 2  If youâre asked to select a USB connection on your device, choose Media device (MTP). 3  Use the File Transfer window that pops up on your computer to drag and drop files, just like other external devices.4  Eject your device from Windows, then unplug the USB cable. Connect your device to your computer using a USB cable. 2  If youâre asked to select a USB connection on your device, choose Media device (MTP). 3  Use the File Transfer window that pops up on your computer to drag and drop files, just like other external devices.