Dell PowerEdge R920 Owner's Manual page 102

Figure 54. Removing and Installing the 2.5 Inch (x4) SAS/SATA Backplane
1. release tab
3. SAS connector
5. backplane hook (4)
Figure 55. 2.5 Inch (x4) SAS/SATA Backplane—Front view
1. SAS connector on the backplane
3. backplane hook (4)
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2. system board miscellaneous signal cable
4. hard drive connector
6. backplane power cable
2. hard drive connector