Dell PowerEdge R620 Owner's Manual page 88

1. backplane signal cable
2. backplane power cable
3. SAS A cable
Figure 46. Cabling Diagram—2.5 Inch (x8) Systems
1. cable retention bracket
2. system board
3. integrated storage controller card
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4. release tabs (2)
5. SAS B cable
4. SAS connector on the system board
5. SAS backplane