Dell DSS 2500 Owner's Manual page 80

Figure 30. Installing the (optional) 2.5 inch internal hard drive carrier
1 internal hard drive carrier guide
3 handle-lock
5 hard drive retention screw (8)
7 lock guide pin
Next steps
1 Reconnect the power and data cables to the internal hard drives.
2 If removed, reinstall the PCIe expansion card riser.
3 If disconnected, reconnect the cables to the expansion card(s).
4 Reinstall the cooling shroud.
5 If required, open the expansion card latch on the cooling shroud to support the full length expansion card.
6 Follow the procedure listed in the After working inside your system section.
80 Installing and removing system components
2 internal hard drive carrier
4 lock guide
6 internal hard drive cage
8 guide slot