How To Automatically and Continuously Overwrite Recordings In An HDCVI DVR
If you would like to set up your HDCVI DVR such that it overwrites existing recordings when it reaches full capacity, do the following:
Navigate to System > General
On this page there should be a feature named "HDD Full"
Click the drop-down and select "OverWrite"
The HDD will now proceed to overwrite the oldest recordings on the HDD. You should notice that your HDD will eventually reach 0 GB of free space, and will remain at this level indefinitely due to this feature being enabled.