Acer Aspire 3000 - Manual (Page 23)

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Ejecting the optical (CD or DVD)
drive tray
To eject the optical drive tray when the computer is turned on, press the drive
eject button.
When the power is off, you can eject the drive tray by using the emergency
eject hole.
Using a computer security lock
A security keylock notch, located on the left hand side of the computer, lets you
connect a Kensington-compatible computer security lock.
Wrap the computer security lock cable around an immovable object such as a
table or handle of a locked drawer. Insert the lock into the notch and turn the
key to secure the lock. Some keyless models are also available.