How to reduce HDD vibration in NVR?

[Description]

How to reduce HDD vibration in NVR? 

[Root Cause]

1. Install the NVR on improperly way.
2. Ambient's issue, such as factory or a construction site.

[Solution]

1. Make sure the NVR is installed on the stable rack or stand. 
2. If the environment generate more vibration but cannot be improved, please select the HDD which have vibration isolation ability (RV Sensor or RAFF) to detect/reduce vibration.