LT Security LTN8600 Series NVR (V2.3.2) - Manual (Page 182)

User Manual of 9600/8600/7700/7600 Series NVR
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3. Click the Detect button to start the detection.
Figure 11. 24 Bad Sector Detection
Note: represents normal sector; represents bad sector detected by Bad Sector Detection; represents
bad sector detected by recording.
And you can click Error info button to see the detailed damage information.
And you can also pause/resume or cancel the detection.