Dahua NVR21-4KS3 Series User Manual page 388

Step 2 Click .
You can configure the Resolution, Frame Rate, Bit Rate and Record Time for the selected
channel.
Click Apply.
Step 3
Then the system will calculate the time period that can be used for storage according to
the channels settings and HDD capacity.
Figure 5-255 Record estimation
Figure 5-256 Modify channel settings
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User's Manual