joliejoe
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Linux file system is different from other files systems like from Windows or Mac but the file system is the collection of files and folders that are stored in separate disk partition. The complete disk partition is then also divided into various file system blocks. And these blocks are further used for storing user data and metadata. This metadata is like a repository that contains information of the file system. This information can be of various types like the type, size, status or anything else of the file system.
One of these important metadata is the Superblock which is important for a healthy Linux file system. In case the Superblock become inaccessible, you can not mount a file system. In Your situation you have mentioned that you have manually shut down your system and it is possible that at that time an application may accessing the superblock and a process was running on. Due to this unstable system shutdown the Superblock Corruption occurred.
There are quite few resolutions to solve this problem. Some of them are:
If you have backup copies of the linux system then you can restore the primary superblock from these backup copies. To do this find the superblock location for /dev/sda2. Now check and repair Linux file system using alternate superblock # abc where abc is the location of the alternate superblock. Then Mount using the mount command via # abc, /dev/sda2/mnt. Now try to browse and access the file system
However these steps are quite difficult for a not so computer savvy person and therefore you should go for third party applications that can simply repair Linux file system and the superblock. These kind of applications will work on almost all different Linux volumes including ext2, ext3, ext4 FAT12, FAT16 and FAT32. There are many software companies providing solution. The Linux data recovery software is the recommended one in solving the problem. Try it.
Reference: Linux Data Recovery
 Posted 537 days ago
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