Dell PowerEdge R230 Owner's Manual page 48

Figure 12. Inside the system—four 3.5-inch cabled hard drive systems
1. control panel module
3. intrusion switch
5. expansion card riser
7. processor
9. cooling fan (4)
48
2. cabled hard drive
4. power supply unit
6. memory module (A1, A2, A3, A4)
8. system board
10. optical drive