Recovering Linux File System After Superblock Corruption

linux25 Recovering Linux File System After Superblock Corruption
Allen Sood asked:

A Linux file system is a collection of various files and folders, which is stored in a separate disk partition. The entire disk partition is then divided into various file system blocks. These blocks are further used for storing the user data or the metadata. The metadata can be referred as the repository that contains the information of the file system. This information could either be the type, size, status, or any other information.

One such metadata structure is the superblock, which is very essential for the health of the Linux system. A file system cannot be mounted if you are not able to access the superblock. This case arises if the superblock is corrupted. Corruption can happen because of various reasons such as virus infections, file system corruption, human errors, etc. In such cases, you should consider taking appropriate measures to perform data recovery of Linux system.

Consider a scenario wherein you have a Linux system having ext3 partition. When you try to access the partition, you are not able to do so. An error message is displayed, that is:

“/dev/sda2: Input/output error
mount: /dev/sda2: can’t read superblock”

The cause of this error message is that the superblock has corrupted because of the aforementioned reasons.
You can restore the primary superblock from the various backup copies that the Linux system maintains for such situations. To do this, you need to:

• Find out superblock location for /dev/sda2
• Check and repair Linux file system using alternate superblock # xyz, where xyz is the location of alternate superblock.
• Mount using mount command viz, # mount /dev/sda2 /mnt
• Try to browse and access the file system.

However, if you still are unable to solve the issue, then you should use a third-party Linux data recovery software that will enable you to perform Linux recovery. Such read-only tools are highly interactive and do not overwrite the original data while scanning the damaged area.

Stellar Phoenix Linux Data Recovery software is an efficient tool that enables you to perform Linux data recovery for various file system volumes such as ext2, ext3, ext4, FAT12, FAT16, and FAT32. It is capable of recovering data from various types of hard drives such as SCSI, SATA, EIDE, and IDE. It is specifically designed to support different Linux distributions such as Red Hat, SUSE, Debian, Caldera, Mandrake, Sorcerer, TurboLinux, Slackware, Gentoo etc. It is compatible with Windows 7, Vista, Server 2003, XP, and 2000.

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