Acer Extensa 5510 - Manual (Page 56)

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Ejecting the optical (CD or DVD)
disk
Press the drive eject button to eject the optical disk when the computer is on.
Note: Slot-load or tray-load depending on model.
Using a computer security lock
The notebook comes with a Kensington-compatible security slot for a 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.