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Why is the NVR beeping?
In the DVR/NVR local interface, go to Menu / System configuration / Exception. Go through the list of exception type. Select each exception type and un-check AUDIBLE WARNING if it is checked for that exception. If the unit stops beeping, then the current exception selected is the cause of the beeping.
Common issues for the DVR/NVR beeping are the following:
HDD not formatted or in error state, IP address conflicted, Record/Capture error, Network disconnected …