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AS THE TITLE SAID ...
*Make sure the NVR works well.
*Make sure the power cable and SATA cable of the HDD are connected correctly and firmly.
*Try another HDD.
*The HDD with a reputable brand and for 24/7 surveillance is recommended.Make sure you back up the important videos timely for safety.
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*Make sure the NVR works well.
*Make sure the power cable and SATA cable of the HDD are connected correctly and firmly.
*Try another HDD.
*The HDD with a reputable brand and for 24/7 surveillance is recommended.Make sure you back up the important videos timely for safety.