Ejecting The Optical Drive Tray; Using A Computer Security Lock - Acer Aspire 9100 User Manual

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Ejecting the optical 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 using the
emergency eject hole.

Using a computer security lock

A security keylock notch, located on the chassis of the computer, lets
you connect a Kensington-compatible computer security lock.
Wrap a 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.