18 Setting Up and Using Your Computer
Front I/O Connectors
1 microphone 
connector
Use the microphone connector to attach a personal 
computer microphone for voice or musical input into a 
sound or telephony program.
2 headphone 
connector
Use the headphone connector to attach headphones.
3 USB connectors (2) Use the front USB connectors for devices that you 
connect occasionally, such as flash memory keys, cameras, 
or bootable USB devices. For more information on 
bootable USB devices see "Boot Sequence" on page 186.
It is recommended that you use the back USB connectors 
for devices that typically remain connected, such as 
printers and keyboards.
4 IEEE 1394 
connector
Use the IEEE 1394 connector for high-speed data devices 
such as digital video cameras and external storage 
devices.
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