Sony VGN-AW21M/H User Manual page 38

Buttons above the numeric keypad
Special-function button
Muting button
Volume control buttons
Drive eject button
Functions
Turns the volume on and off.
Decrease (-) and increase (+) the volume.
Ejects the optical disc drive tray.
If this button does not work, try the substitute drive eject button on the optical disc drive.
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Using Your VAIO Computer