Dell PowerEdge T620 Owner's Manual page 94

Figure 48. Removing and Installing 2.5 Inch (x16) Plus 2.5 Inch (x4) SAS/SATA Backplane
1. backplane
2. PCIe D cable
3. power cable
4. PCIe C cable
5. PCIe B cable
6. signal cable
7. PCIe A cable
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8. release pin
9. signal cable
10. power cable
11. SAS A cable
12. SAS B cable
13. backplane