Dahua NVR21-4KS3 Series User Manual page 112

Step 4 Match the four screw holes on the HDD with the four holes on the bracket and then fasten
the screws.
The HDD is fixed to the bracket.
Step 5 see Step 4 to install other HDDs.
Figure 3-20 Remove screws (1.5U)
Figure 3-21 Remove screws (2U)
Figure 3-22 Fasten screws
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User's Manual