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.
What you need. To install the Windows 7 USB/DVD Download Tool, you need at least a Pentium 233 MHz processor and 50MB of free hard disk space. You can install the tool in Windows XP SP2, Windows Vista, or Windows 7 (32-bit or 64-bit).Your USB flash drive must be at least 4GB and it should not have any other files on it.nce you insert the bootable USB flash drive into the system on which you want to install Windows 8, restart the system, and then follow the onscreen instructions to access the boot menu. On my test system, the boot menu looked like the one shown in Figure J.