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.
USB device support. [Get the Custom USB device access sample now.]. A new Windows 8.1 namespace offers app support for USB devices: Windows.Devices.Usb. You can use it to write a Windows Store app that talks to a custom USB device.ight-click the device and select Update Driver Software. In the wizard, select Browse my computer for driver software. On the next page, select Let me pick from a list of device drivers on my computer. On the next page, from the list, select Universal Serial Bus devices.