We can view superblock header of an existing file system using dumpe2fsįilesystem UUID:d6cd4d1a-c69f-4e81-8e7a-ed6cf0be68dbįilesystem features:has_journal ext_attr resize_inode dir_index filetype needs_recovery extent 64bit flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isizeįilesystem created:Wed Dec 20 02:33:43 2017ĭirectory Hash Seed: c577c1b0-aaa9-4d27-b5e6-54bd5b9540d1 How can see information about superblock and magic number? Magic numbers/File signatures are t not visible to the user.

Magic numbers are the first few bytes of a file which are unique to a particular file type and they are also called file signature. Hence, for each file system, the superblock is retained in multiple redundant copies. If the superblock of a partition is corrupt, we are not able to mount the file system of partition by operating system. The superblock means a file system metadata (data of a data) that describes the size, type, and status of the file system and information regarding other metadata structures. It is very significant to the file system. Sometimes fsck in disks ends up in an error “Bad magic number in Superblock while trying to open /dev/sdb”.

The Server will go down due to issues in disks attached.

Verify disk could not unmount disk