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review the usb hub The hub has its own transformer and it supplies power to the bus so that the devices do not overload the computer 's supply. If you have lots of unpowered devices like mice and cameras, you probably need a powered hub. If you have lots of self-powered devices (like printers and scanners), then your hub does not need to be powered -- none of the devices connecting to the hub needs additional power, so the computer can handle it. What is virus Computer? virus may be modified, either by the original author or someone else, so that a more harmful version of it appears. It is also possible that the modification produces a less harmful virus, but that has only rarely happened.