HP Nc6220 Hardware-Software Guide - Page 129
USB Device Connection, Operating System and Software
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USB Devices USB Device Connection USB hubs can be connected to a USB port on the notebook or on an optional docking device, or to other USB devices. Hubs support varying numbers of USB devices and are used to increase the number of USB devices in the system. Powered hubs must be connected to external power. Unpowered hubs must be connected either to a USB port on the notebook or to a port on a powered hub. Operating System and Software A USB device functions in the same way as a comparable non-USB device, with one exception. By default, USB devices do not function unless an operating system that supports USB is installed in the notebook. Some USB devices may require additional support software, which is usually included with the device. For more information and software installation instructions, refer to the documentation included with the device. Hardware and Software Guide 9-2