1. Upload the detective script hd_tools-1.6.tar.bz2 to the NVR server by sftp.
You could get the script here,
2. Decompress the script with the command below,
tar -xf hd_tools-1.6.tar.bz2
3. Enter the hd_tool directory, and run the command below
Then it will give the result like below. We can find that the Score of slot 9 is very slow. The critical point is 80. And the current value is much lower than 80. So we can conclude that this disk is faulty and need to be replaced.