Lenovo ThinkStation D20 - Manual (Page 13)

Locating components
To remove the computer cover, see “Removing the computer cover” on page 11.
Figure 3 “Component locations” on page 7 shows the location of the components in your computer.
Figure 3. Component locations
1 Microprocessors and heat sinks (2) 6 Hard disk drive bays (5)
2 Optical drive bays (3) 7 Hard disk drive fan assembly
3 Internal speaker 8 Adapter card retainer
4 3.5-inch diskette drive or card reader 9 Rear fan assembly
5 Front bezel 10 Power supply assembly
Chapter 2 . Overview 7