Hi,
Check this post to see if fsck can fix the problem.
If not, then your disk may be unfortunately corrupted permanently.
Here’s another article about using backup superblock.
If all of those measures don’t work, the final extreme measure is to apply mke2fs -S option to override the superblock descriptor.
-S Write superblock and group descriptors only. This is an extreme measure to be taken only in the very unlikely case that all of the superblock and backup superblocks are corrupted, and a last-ditch recovery method is desired by ex‐
perienced users. It causes mke2fs to reinitialize the superblock and group descriptors, while not touching the inode table and the block and inode bitmaps. The e2fsck program should be run immediately after this option is used,
and there is no guarantee that any data will be salvageable. Due to the wide variety of possible options to mke2fs that affect the on-disk layout, it is critical to specify exactly the same format options, such as blocksize, fs-
type, feature flags, and other tunables when using this option, or the filesystem will be further corrupted. In some cases, such as filesystems that have been resized, or have had features enabled after format time, it is impossi‐
ble to overwrite all of the superblocks correctly, and at least some filesystem corruption will occur. It is best to run this on a full copy of the filesystem so other options can be tried if this doesn't work.
DO NOT DO THIS UNLESS OTHER MEASURES DON’T WORK! This is how I damaged my disk permanently and why I rebuild my system 