Dahua NVR52-4KS2 Series User Manual page 396

Step 2 Click .
You can configure the Resolution , Frame Rate, Bit Rate and Record Time for the
selected channel.
Step 3 Click Apply.
Then the system will calculate the time period that can be used for storage according to
the channels settings and HDD capacity.
Figure 5-254 Record estimation
Figure 5-255 Modify channel settings
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User's Manual