Lenovo 30DH00H8IX User Manual page 80

5. Remove the optical drive cage with the secondary storage drive cages from the chassis.
6. Remove the screw that secures the 3.5-inch secondary storage drive cage to the optical drive cage.
Then, remove the optical drive cage from the 3.5-inch secondary storage drive cage.
7. Install the optical drive cage to the 3.5-inch secondary storage drive cage.
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P340 User Guide