LT Security LTN7600 Series NVR (V2.2.3) - Manual (Page 173)

User Manual of DS-9600/8600/7700/7600 Series NVR
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Figure 10. 23 Bad Sector Detection
4. If the HDD is normal you can see the green color icon on the screen, otherwise the red
icon is shown.
And you can click Error info button to see the detailed damage information
And you can also pause or cancel the detection.