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.
Also, you'll need an 8GB or larger USB flash drive. 1  Download the Windows 8 .ISO from the Microsoft website. 2  Mount the .ISO file as a drive 3  ... if you don't have a tool to do this, I suggest SlySoft's Virtual CloneDrive-it's free! Next you need to make your USB flash drive bootable. 2  Start another Command Prompt as an administrator and navigate to the boot folder of the Windows 8 ISO image then type the following: bootsect /nt60 X: Note: Where X is the drive letter for your USB flash drive.