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Superblock. The superblock is a unique data structure in a filesystem (though multiple copies exist to guard against corruption). The superblock holds metadata about the filesystem, like which inode is the top-level directory and the type of filesystem used.
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-S Write superblock and group descriptors only. This is useful if all of the superblock and backup superblocks are corrupted, and a last- ditch recovery method is desired. It causes mke2fs to reinitialize the superblock and group descriptors, while not touching the inode table and the block and inode bitmaps.
*Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208* Pick an alternate superblock - keep in mind that the first one is the default and its bad so let's not use that one. You will also want to pick one from the list you get from your partition. Do not use the example.
When rebooting I was left with unbootable ext4 partition and unmountable (mount: wrong fs type, bad option, bad superblock on /dev/nvme0n1p6) one. When checking that partition or disk ( fsck /dev/nvme0n1p6 or fsck /dev/nvme0n1 ) it reported the " Bad magic number in super-block " message - the same as in original post's question.
If the device is valid and it really contains an ext2/ext3/ext4 filesystem (and not swap or ufs or something else), then the superblock is corrupt, and you might try running e2fsck with an alternate superblock: e2fsck -b 8193 <device> or e2fsck -b 32768 <device> ~# mount /DATA mount: /DATA: WARNING: device write-protected, mounted read-only.
resize2fs 1.42 (29-Nov-2011) resize2fs: Device or resource busy while trying to open /dev/sda5 Couldn't find valid filesystem superblock. Finally, this is the output of pvs: PV VG Fmt Attr PSize PFree /dev/sda5 owncloud-vg lvm2 a- 499.76g 340.04g fdisk -l /dev/sda shows the correct amount of space.
sudo pvscan PV /dev/sdc5 VG mint-vg lvm2 [446.65 GiB / 0 free] Total: 1 [446.65 GiB] / in use: 1 [446.65 GiB] / in no VG: 0 [0 ] siv@BigBlackIII:~$ sudo vgscan Found volume group "mint-vg" using metadata type lvm2 siv@BigBlackIII:~$ sudo vgchange -a y 2 logical volume(s) in volume group "mint-vg" now active siv@BigBlackIII:~$ sudo lvscan ACTIVE ...
I understand that I can list the location of a filesystem's superblocks using the following commands. Example First get the device handle for the current directory. $ df -h . Filesystem ...
If the device is valid and it really contains an ext2/ext3/ext4 filesystem (and not swap or ufs or something else), then the superblock is corrupt, and you might try running e2fsck with an alternate superblock: e2fsck -b 8193 <device> or e2fsck -b 32768 <device> mike@bambam:~> sudo fdisk -l /dev/sdg [sudo] password for root: Disk /dev/sdg: 1.82 ...