Dell PowerVault MD3860i Owner's Manual page 26

Figure 15. Removing and Installing the 2.5 Inch Physical Disk in a 2.5 Inch Physical-Disk Carrier
1. 2.5 inch physical drive cage
3. release handle
5. carrier for 2.5 inch physical disk
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2. guide pin (4)
4. holes on physical disk (4)
6. 2.5 inch physical disk