HP Compaq d220 MT Hardware Reference Manual page 19

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Hardware Reference Guide
7. Remove the four screws that secure the drive cage to the front of
the chassis 1 and then remove the single screw that attaches the
lower drive cage to the fixed upper drive cage on the right side of
the chassis 2.
8. Slide the lower drive cage back about 1/2 inch to release it from
the upper cage 3.
Removing the Lower Drive Cage
To install the lower drive cage, reverse the removal procedure.
CAUTION: When installing the retaining screws always use the short
(5/32" long) screw in the side mounting position and the 4 longer screws
on the front of the chassis.
Hardware Upgrades
1–15