Dell External OEMR R620 Owner's Manual page 82

1. cable retention bracket
2. system board
3. integrated storage controller card
4. SAS connector on system board
5. SAS backplane
Figure 41. Removing and Installing the 2.5 Inch (x4 SAS Hard-Drive and x2 Dell PowerEdge Express Flash [PCIe SSD])
Backplane
1. backplane signal cable
2. PCIe A cable
3. backplane signal cable
4. PCIe B cable
5. backplane power cable
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6. release tabs (2)
7. SAS B cable
8. SAS hard-drive connector on backplane
9. PCIe connector on backplane