# dumpe2fs /dev/sda1 | grep -i superblock
Output:

Primary superblock at 0, Group descriptors at 1-7
  Backup superblock at 32768, Group descriptors at 32769-32775
  Backup superblock at 98304, Group descriptors at 98305-98311
  Backup superblock at 163840, Group descriptors at 163841-163847
  Backup superblock at 229376, Group descriptors at 229377-229383
  Backup superblock at 294912, Group descriptors at 294913-294919
  Backup superblock at 819200, Group descriptors at 819201-819207
  Backup superblock at 884736, Group descriptors at 884737-884743
  Backup superblock at 1605632, Group descriptors at 1605633-1605639
  Backup superblock at 2654208, Group descriptors at 2654209-2654215
  Backup superblock at 4096000, Group descriptors at 4096001-4096007
  Backup superblock at 7962624, Group descriptors at 7962625-7962631
  Backup superblock at 11239424, Group descriptors at 11239425-11239431
  Backup superblock at 20480000, Group descriptors at 20480001-20480007
  Backup superblock at 23887872, Group descriptors at 23887873-23887879

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