Compaq 159715-002 - Deskpro EN - DT 6650 Model 10000 Configuration Manual page 36

2-26 Upgrading the Compaq Deskpro EP Series
6. Install two guide screws on each side of the adapter 1.
7. Install the adapter in the desired drive bay 2 by sliding it
into 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 bottom bay in the
minitower configuration and the topmost bay in the
desktop configuration.
Aligning the Guide Screws and Installing an Adapter with a 3.5-Inch Drive