Dell PowerEdge R730xd Owner's Manual page 191

Figure 105. Removing the 2.5 inch (x24) SAS/SATA backplane
1. release tab (2)
3. backplane power cable
5. backplane signal cable
7. backplane power cable
9. SAS cable (3)
11. USB cable
13. hard drive backplane connectors (24)
2. left ear control panel cable
4. hard drive backplane expander
6. hard drive backplane assembly
8. mini SAS cable connector (2)
10. control panel cable
12. right ear control panel flex cable
191