What to do when Superblock Recovery Fails

Published: 26th February 2009

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The Superblock is the most important part of a Linux computer that contains the basic information about file system like its size, its type etc. This information allows file system manager to maintain the file system.

Generally the superblock stored in the Block Group 0 is read by the operating system when file system is mounted, but every Block Group stores a copy of superblock. This copy can be used to restore the superblock if primary superblock gets corrupted.

Every Linux file system contains these redundant copies of the superblock. It is very helpful to overcome several emergency situations. You can see the primary and the backup superblock location by using the following command:

dumpe2fs /dev/hda3 | grep -i superblock

Here /dev/hd3 is the name of drive on which your file system and superblock are located.

You can identify the superblock corruption by checking the failed file system. You can restore the superblock using simple Linux commands.

By using th above command, you will see the location of primary superblock and first backup. Now use the following command to restore the superblock from first backup:

e2fsck -b /dev/hda3

In this way, you can easily restore your superblock and can prevent the data loss situations. But sometimes, using these commands can further damage your file system and cause serious data loss issues. These situations include:

If you use these commands on a mounted file system.

If the file system was created using customized parameters.

In these cases, you may lose all your important data and you need to go for Linux Data Recovery to extract your data back. To carry out complete Linux Recovery, you should use specially designed tools known as Linux Recovery software.

Stellar Phoenix Linux Data Recovery is the most powerful and easy to use Linux Recovery tool that supports Data Recovery Linux from Ext2, Ext3 and ReiserFS file system based volumes in all data loss cases. Phoenix Linux Data Recovery is compatible with most of the Linux distributions.

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