i know this i old, but we might as well record the answer if anyone wants to know. To the best of my understanding, floppy disks could sometimes be recovered using a write test as the data was refreshed. In this case, the data was difficult to read due to something such as bit drift, or perhaps the data was written using a different drive & the tracks were not aligned exactly the same. In your case the medium was still good, only the strength of the magnetic field in those blocks was weak. Rewriting...
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