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> I think I found why digrom2 doesn't work for me :

Ok ! fine, you got it. We have 128 fat entries in a fat
sector, so 128 clusters in a fat sector.

Thus,

1) if (cluster < 2 || (cluster * sectors_per_cluster) >=
sectors_per_fat)
  break;

should be :

2) if (cluster < 2 || (cluster >= (sectors_per_fat * 128)))
     break;

just create a variable :
  unsigned long clusters_per_fat = sectors_per_fat * 128;

  ...
  if ((cluster - 2) >= clusters_per_fat)
    break;
 
I'm sorry, line 1) was totally wrong :((( there is a
confusion between the number of sector containing the fat
and the number of clusters the fat handles.

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