Reason why the disk fault indicator is not on when the disk is faulty

The storage disk has the physical status and logical status. The physical status can be considered as the physical feature status of the disk. Therefore, you are advised to replace the disk when a physical fault occurs. The logical status is assigned by the software. In some cases, the disk can still be used when a logical fault occurs. When the I/O of the disk fails, the logic is faulty.
If a disk is physically faulty, the logic is also faulty. The software turns on the fault indicator. Because the disk cannot be used, the disk fault indicator is on and prompts you to replace the disk.
The logic of a disk is faulty, but the physical status may not be faulty. In some cases, the disk can still be used. Therefore, the disk fault indicator is not turned on.

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