Lenovo ThinkStation P320 Hardware Maintenance Manual page 102

Figure 55. Sliding the new 3.5-inch internal storage drive into the kit
6. Pivot the rear cover of the kit inward until you hear a click. The rear cover is secured in place.
Figure 56. Pivoting the rear cover inward
2.5-inch internal storage drive
To install or replace a 2.5-inch internal storage drive in the kit, do the following:
1. Slide the kit out of the chassis. See "Optical drive" on page 80.
2. Press the clip as shown to open the rear cover of the kit.
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P320 Hardware Maintenance Manual