Compaq 239158-999 - Mini Tower - Power Supply 250 Watt Hardware Reference Manual page 36

Hardware Upgrades
2-18
7. Install two guide screws on each side of the adapter
8. Install the adapter in the desired drive bay
the front of the drive cage; the drivelock automatically secures
the adapter when it snaps into place.
The primary 3.5-inch diskette drive should only be installed into
bay 3. Bay 3 is the topmost bay in the desktop configuration.
Aligning the Guide Screws and Installing an Adapter with a 3.5-
Inch Drive on a Minitower (top) and a Desktop (bottom)
1
.
2
by sliding it into
Hardware Reference Guide