Compaq dx2390 Microtower Hardware Reference Manual page 39

7. Push down the latch on the side of the hard disk drive cage (1), then slide the hard disk drive cage
away from the bottom of the chassis (2) as shown below.
Figure 2-27 Releasing the Hard Drive Cage
8. Lift the hard disk drive cage out of the chassis.
Figure 2-28 Removing the Hard Drive Cage
Installing Additional Drives 33