Compaq Armada 7400 Reference Manual page 71

1. Turn off the computer.
2. If the hard drive was previously located in the dedicated hard
drive bay, remove the hard drive from the hard drive tray.
3. Insert the hard drive into the Armada 7300/7400 Hard Drive
MultiBay Adapter with the hard drive label facing down.
4. Position the hard drive carrier against the left side of the
MultiBay
5. Slide the Hard Drive MultiBay Adapter in until it locks into
place.