Acer Extensa 5120 - Manual (Page 75)

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Universal Serial Bus (USB)
The USB 2.0 port is a high-speed serial bus which allows you to connect USB
peripherals without taking up precious system resources.
IEEE 1394 port
The computer's IEEE 1394 port allows you to connect to an IEEE 1394 supported
devices like a DVD/CD-RW combo or DVD-Dual drive.