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- <h1 class="firstHeading">Advanced Find EXT2 EXT3 Backup SuperBlock</h1>
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- <h3 id="siteSub">From CGSecurity</h3>
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- <p>If the EXT2/EXT3 primary superblock is damaged, the filesystem can not be mounted.
-</p><p>If the normal superblock is corrupted, fsck will search an alternative superblock but
-may failed to find one of them. The location of the backup superblocks are
-dependent on the filesystem's blocksize, this size is stored in the superblock,
-so it's not known while searching for backup superblock.
-To search them, running <a href="testdisk.html" title="TestDisk">TestDisk</a>,
-in the Advanced menu, select the partition and choose <b>Superblock</b>.
-</p><p>The superblock contains all the information about the configuration of
-the filesystem. The primary copy of the superblock is stored at an
-offset of 1024 bytes from the start of the partition, and it is essential
-to mounting the filesystem. Since it is so important, backup copies of
-the superblock are stored in block groups throughout the filesystem.
-The first version of ext2 (revision 0) stores a copy at the start of
-every block group, along with backups of the group descriptor block(s).
-Because this can consume a considerable amount of space for large
-filesystems, later revisions can optionally reduce the number of backup
-copies by only putting backups in specific groups (this is the sparse
-superblock feature). The groups chosen are 0, 1 and powers of 3, 5 and 7.
-</p><p>Now using the value given by TestDisk, you can use fsck to repair your ext2/ext3 filesystem.
-Ie if TestDisk has found a superblock at block number 24577 and a blocksize of 1024 bytes, run
-</p>
-<pre>
-/sbin/fsck.ext3 -b 24577 -B 1024 /dev/hda1
-</pre>
-<p>Back to <a href="running_testdisk.html" title="Running TestDisk">Running the TestDisk Program </a>
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