Lenovo E100 Hardware Maintenance Manual page 106

5. Remove the plastic panel in the bezel for bay 2 by squeezing the plastic tabs
6. If the drive you are replacing has jumpers on the rear, make sure the jumpers
7. Slide the new drive into the bay until the screws holes on each side are aligned
8. Reconnect the power cable and signal cable to the new optical drive.
9. Go to "Completing the FRU replacement" on page 105.
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Lenovo 3000 E100
that secure the panel on the inside of the bezel.
on the new drive are in the same exact position as the drive being replaced.
and install two screws in each side of the drive.