SF step D4 analysis

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This step is also one of the important steps in self-scan.
It checks the damaged tracks, and if there is a continuous bad sector on the track, it adds the entire track to Module 36
It also rebuilding the T-List according to the new inputs.

This step is often done in three stages
One of them is adding damaged tracks to the log. The last step is rebuilding the list of track defectes, or T-List, as shown in the following image

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Therefore, the parameters in each stage of D4 differ

Therefore, if the T-List is corrupted, you can simply do step D4, which builds the list with the entries originally saved in the log.