Dell PowerEdge C6220 Hardware Owner's Manual page 263

11 Remove the screws that secure the backplane for expander
configuration to the hard-drive cage. See Figure 3-92
12 Remove the backplane for expander configuration from the hard-drive
cage. See Figure 3-92
Figure 3-92. Removing and Installing the Backplane for Expander Configuration
From the Hard-Drive Cage
1 hard-drive cage
3 screw (11)
2 2.5-inch hard-drive backplane
for Expander Configuration
Installing System Components | 263