Dell EMC PowerEdge R620 Owner's Manual page 82

5 SAS backplane
Figure 47. Removing and installing the 2.5 inch (x4 sas hard-drive and x2 dell poweredge express flash [pcie ssd]) backplane
1 backplane signal cable
3 backplane signal cable
5 backplane power cable
7 SAS B cable
9 PCIe connector on backplane
82 Installing and removing system components
2 PCIe A cable
4 PCIe B cable
6 release tabs (2)
8 SAS hard-drive connector on backplane