Compaq Armada 7400 Reference Manual page 70

1. As a precautionary measure, Compaq recommends that you
back up all information on the hard drive.
2. Turn off the computer.
3. Tilt the computer at an angle so you can see the bottom front
of the computer.
4. Slide the MultiBay release latch toward the front of the
computer
MultiBay Adapter which accommodates the hard drive.
5. Pull out the Hard Drive MultiBay Adapter and hard drive .
to release the Armada 7300/7400 Hard Drive