Dell EMC PowerEdge R620 Owner's Manual page 85

Figure 51. Cabling diagram—2.5 inch (x8) systems
1 cable retention bracket
3 SAS controller card
Figure 52. Removing and installing the 2.5 inch (x10) hard-drive backplane
1 SAS backplane
3 SD signal cable
2 system board
4 SAS backplane
2 backplane power cable
4 backplane signal cable
Installing and removing system components 85