Seagate Exos AP 4U100 Installation And Maintenance Manual page 109

Installing a PCIe card in a controller module
Each Controller module has 2 slots for PCIe cards.
Adding external PCIe cards
To add a PCIe card to a Controller module, follow the steps mentioned below.
1. Remove the appropriate Controller module out of the enclosure. See "Removing a Controller module" (page 107).
2. Remove the two screws present on the sides of the Controller module (see Figure 93).
Figure 93 Removing blank cover screws
3. After making sure that you have removed two screws present on the sides, loose the center locking screw and pull up
the metal cover (see Figure 94).
CAUTION: An attempt to remove the metal cover without removing the side-screws can damage the metal cover. You
must remove two screws on the sides before touching the central screw.
Replacing a Controller module 109