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.
Step 1. Transfer any files or folders that you wish to keep from the external hard drive to another computer. Drag and drop the files or use a backup utility. Step 2. Connect the external hard drive to the PC by plugging the USB or IEEE1394 cable into the appropriate interface.Related Reading: My Computer Won't Boot Up With the External USB Hard Drive Attached. Step 3. Click the Start icon in the lower left hand corner of the PC desktop.tep 2. Connect the external hard drive to the PC by plugging the USB or IEEE1394 cable into the appropriate interface. Related Reading: My Computer Won't Boot Up With the External USB Hard Drive Attached. Step 3. Click the Start icon in the lower left hand corner of the PC desktop.