Lenovo IdeaPad U110 - Manual (Page 57)

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Chapter 3. Using external devices
Connecting a Universal Serial Bus (USB) device - - - - - - - -
Your computer comes with three Universal Serial Bus compatible with USB
2.0 or USB 1.1 devices such as a keyboard, mouse, camera, hard disk drive,
printer, scanner, and optical drive. USB allows devices to be connected and
disconnected without rebooting the computer (hot swapping), and allows
specific classes of hardware to be used without requiring individual device
drivers to be installed.