Dahua NVR21-4KS3 Series User Manual page 106

Step 2 Remove the cover in the direction of the arrow as shown in the figure below.
Step 3 Turn over the device, and align the HDD to the four holes of bottom panel, and then fix the
HDD with screws.
Step 4 Connect HDD to the device using data cable and power cable.
Figure 3-7 Loosen screws
Figure 3-8 Remove cover
Figure 3-9 Align HDD
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User's Manual