Peripherals and options40English USB devicesYour computer features four Universal Serial Bus (USB) 2.0 ports forconnecting a range of USB peripherals. See “External input devices” onpage 39, and “Printer” on page 41 for information on connecting aUSB keyboard, keypad, mouse or printer. Other common USB devicesinclude digital cameras, scanners, and external storage devices.USB is plug and play, which means that you can connect and start usinga USB device without having to restart your computer. You can alsodisconnect the device at any time.A further advantage of USB is the ability to use USB hubs. This meansthat several devices can share a USB port simultaneously.